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Neutron em.s.ion in ultraperipheral Pb-Pb collisions at sNN=5.02 TeV

Physical Review C 2023年第6期107卷 064902-064902页

作者： s. Acharya D. Adamová A. Adler G. Aglieri Rinella m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali Y. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev m. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli C. Anuj N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli m. Aresti R. Arnaldi I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi A. Badalà Y. W. Baek X. Bai R. Bailhache Y. Bailung R. Bala A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio m. Barlou G. G. Barnaföldi L. s. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch F. Baruffaldi N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova V. Belyaev G. Bencedi s. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov s. Boi J. Bok L. Boldizsár A. Bolozdynya m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. m. Bouziani L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno m. D. Buckland D. Budnikov H. Buesching s. Bufalino O. Bugnon P. Buhler Z. Buthelezi J. B. Butt s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho P. Camerini F. D. m. Canedo m. Carabas A. A. Carballo F. Carnesecchi R. Caron J. Castillo Castellanos F. Catalano C. Ceballos sanchez I. Chakaberia P. Chakraborty s. Chandra s. Chapeland m. Chartier s. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. s. Chizzali J. Cho s. Cho P. Chochula P. Chri Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico COMSATS University Islamabad Islamabad Pakistan Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy University of Houston Houston Texas United States Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California United States SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes C

In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation energy is below a few tens of meV, and a small number of nucleons are emitted in electromagnetic dissociation (EmD) of primary nuclei, in contrast to complete nuclear fragmentation in hadronic interactions. The cross sections of em.s.ion of given numbers of neutrons in UPCs of Pb208 nuclei at sNN=5.02 TeV were measured with the neutron zero degree calorimeters (ZDCs) of the ALICE detector at the LHC, exploiting a similar technique to that used in previous studies performed at sNN=2.76 TeV. In addition, the cross sections for the exclusive em.s.ion of one, two, three, four, and five forward neutrons in the EmD, not accompanied by the em.s.ion of forward protons, and thus m.s.ly corresponding to the production of Pb207,206,205,204,203, respectively, were measured for the first time. The predictions from the available models describe the measured cross sections well. These cross sections can be used for evaluating the impact of secondary nuclei on the LHC components, in particular, on superconducting magnets, and also provide useful input for the design of the Future Circular Collider (FCC-hh).

关键词： Nuclear reactions Relativistic heavy-ion collisions

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Pseudorapidity densities of charged particles with transverse momentum thresholds in pp collisions at s=5.02 and 13 TeV

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Physical Review D 2023年第7期108卷 072008-072008页

作者： s. Acharya D. Adamová A. Adler G. Aglieri Rinella m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev m. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli m. Aresti R. Arnaldi J. G. m. C. A. Arneiro I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio m. Barlou G. G. Barnaföldi L. s. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova V. Belyaev G. Bencedi s. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov s. Boi J. Bok L. Boldizsár A. Bolozdynya m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. m. Bouziani L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno m. D. Buckland D. Budnikov H. Buesching s. Bufalino O. Bugnon P. Buhler Z. Buthelezi s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho P. Camerini F. D. m. Canedo m. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos sanchez I. Chakaberia P. Chakraborty s. Chandra s. Chapeland m. Chartier s. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. s. Chizzali J. Cho s. Cho P. Chochula P. Chri Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell’Università Bologna Italy Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Universidade de São Paulo (USP

The pseudorapidity density of charged particles with minimum transverse momentum (pT) thresholds of 0.15, 0.5, 1, and 2 GeV/c is measured in pp collisions at the center of m.s. energies of s=5.02 and 13 TeV with the ALICE detector. The study is carried out for inelastic collisions with at least one primary charged particle having a pseudorapidity (η) within ±0.8 and pT larger than the corresponding threshold. In addition, measurements without pT-thresholds are performed for inelastic and nonsingle-diffractive events as well as for inelastic events with at least one charged particle having |η|<1 in pp collisions at s=5.02 TeV for the first time at the LHC. These measurements are compared to the pythia 6, pythia 8, and epos-lhc models. In general, the models describe the η dependence of particle production well. However, discrepancies are observed for the highest transverse momentum threshold (pT>2 GeV/c), highlighting the importance of such measurements for tuning event generators. The new measurements agree within uncertainties with results from the ATLAs and Cms experiments obtained at s=13 TeV.

关键词： Hadron-hadron interactions Particle production QCD phenomenology

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Investigation of K+K− interactions via femtoscopy in Pb-Pb collisions at sNN=2.76 TeV at the CERN Large Hadron Collider

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Physical Review C 2023年第5期107卷 054904-054904页

作者： s. Acharya D. Adamová A. Adler G. Aglieri Rinella m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev m. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli m. Aresti R. Arnaldi I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio m. Barlou G. G. Barnaföldi L. s. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J.L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova V. Belyaev G. Bencedi s. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov s. Boi J. Bok L. Boldizsár A. Bolozdynya m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov H. Bossi E. Botta Y. E. m. Bouziani L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno m. D. Buckland D. Budnikov H. Buesching s. Bufalino O. Bugnon P. Buhler Z. Buthelezi s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J.m.m. Camacho P. Camerini F. D. m. Canedo m. Carabas A. A. Carballo A. G. B. Carcamo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos sanchez I. Chakaberia P. Chakraborty s. Chandra s. Chapeland m. Chartier s. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. s. Chizzali J. Cho s. Cho P. Chochula P. Christakoglou C. H. Christensen P. Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Department of Physics University of Oslo

Femtoscopic correlations of nonidentical charged kaons (K+K−) are studied in Pb-Pb collisions at a center-of-m.s. energy per nucleon-nucleon collision sNN=2.76 TeV by ALICE at the CERN Large Hadron Collider. One-dimensional K+K− correlation functions are analyzed in three centrality classes and eight intervals of particle-pair transverse momentum. The Lednický and Luboshitz interaction model used in the K+K− analysis includes the final-state Coulomb interactions between kaons and the final-state interaction through a0(980) and f0(980) resonances. The m.s. of f0(980) and coupling were extracted from the fit to K+K− correlation functions using the femtoscopic technique. The measured m.s. and width of the f0(980) resonance are consistent with other published measurements. The height of the ϕ(1020) m.s.n peak present in the K+K− correlation function rapidly decreases with increasing source radius, qualitatively in agreement with an inverse volume dependence. A phenomenological fit to this trend suggests that the ϕ(1020) m.s.n yield is dominated by particles produced directly from the hadronization of the system. The small fraction subsequently produced by final-state interactions could not be precisely quantified with data presented in this paper and will be assessed in future work.

关键词： Nuclear reactions Particle correlations & fluctuations Relativistic heavy-ion collisions

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measurement of the Λ hyperon lifetime

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Physical Review D 2023年第3期108卷 032009-032009页

作者： s. Acharya D. Adamová A. Adler G. Aglieri Rinella m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev m. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli m. Aresti R. Arnaldi J. G. m. C. A. Arneiro I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio m. Barlou G. G. Barnaföldi L. s. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova V. Belyaev G. Bencedi s. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov s. Boi J. Bok L. Boldizsár m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. m. Bouziani L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno m. D. Buckland D. Budnikov H. Buesching s. Bufalino P. Buhler Z. Buthelezi A. Bylinkin s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho P. Camerini F. D. m. Canedo m. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos sanchez I. Chakaberia P. Chakraborty s. Chandra s. Chapeland m. Chartier s. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. s. Chizzali J. Cho s. Cho P. Chochula P. Christakoglou C. Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Johann-Wolfgang-Goethe Universität Frankfurt Institut fär Informatik Fachbereich Informatik und Mathematik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum fär Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut fär Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Mänster Institut fär Kernphysik Mänster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Universidade de São Paulo (USP) São Paul

A new, more precise measurement of the Λ hyperon lifetime is performed using a large data sample of Pb–Pb collisions at sNN=5.02 TeV with ALICE. The Λ and Λ¯ hyperons are reconstructed at midrapidity using their two-body weak decay channel Λ→p+π− and Λ¯→p¯+π+. The measured value of the Λ lifetime is τΛ=[261.07±0.37(stat.)±0.72(syst.)] ps. The relative difference between the lifetime of Λ and Λ¯, which represents an important test of CPT invariance in the strangeness sector, is also measured. The obtained value (τΛ−τΛ¯)/τΛ=0.0013±0.0028(stat.)±0.0021(syst.) is consistent with zero within the uncertainties. Both measurements of the Λ hyperon lifetime and of the relative difference between τΛ and τΛ¯ are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise.

关键词： Hadron-hadron interactions

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Light (anti)nuclei production in Pb-Pb collisions at sNN=5.02 TeV

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Physical Review C 2023年第6期107卷 064904-064904页

作者： s. Acharya D. Adamová A. Adler G. Aglieri Rinella m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev m. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli m. Aresti R. Arnaldi J. G. m. C. A. Arneiro I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio m. Barlou G. G. Barnaföldi L. s. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova V. Belyaev G. Bencedi s. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov s. Boi J. Bok L. Boldizsár A. Bolozdynya m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. m. Bouziani L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno m. D. Buckland D. Budnikov H. Buesching s. Bufalino O. Bugnon P. Buhler Z. Buthelezi s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho P. Camerini F. D. m. Canedo m. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos sanchez I. Chakaberia P. Chakraborty s. Chandra s. Chapeland m. Chartier s. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. s. Chizzali J. Cho s. Cho P. Chochula P. Chri Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Fachbereich Informatik und Mathematik Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P. J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Westfälische Wilhelms-Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Universidade de São Paulo (USP) São Paul

The measurement of the production of deuterons, tritons and He3 and their antiparticles in Pb-Pb collisions at sNN=5.02TeV is presented in this article. The measurements are carried out at midrapidity (|y|< 0.5) as a function of collision centrality using the ALICE detector. The pT-integrated yields, the coalescence parameters and the ratios to protons and antiprotons are reported and compared with nucleosynthesis models. The comparison of these results in different collision systems at different center-of-m.s. collision energies reveals a suppression of nucleus production in small systems. In the statistical Hadronisation model framework, this can be explained by a small correlation volume where the baryon number is conserved, as already shown in previous fluctuation analyses. However, a different size of the correlation volume is required to describe the proton yields in the same data sets. The coalescence model can describe this suppression by the fact that the wave functions of the nuclei are large and the fireball size starts to become comparable and even much smaller than the actual nucleus at low multiplicities.

关键词： Particle & resonance production Particle correlations & fluctuations Relativistic heavy-ion collisions A ≤ 5

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Higher-order correlations between different moments of two flow amplitudes in Pb-Pb collisions at sNN=5.02 TeV

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Physical Review C 2023年第5期108卷 055203-055203页

作者： s. Acharya D. Adamová A. Adler G. Aglieri Rinella m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt I. Altsybeev m. N. Anaam C. Andrei A. Andronic V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli m. Aresti R. Arnaldi J. G. m. C. A. Arneiro I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung A. Balbino A. Baldisseri B. Balis D. Banerjee Z. Banoo R. Barbera F. Barile L. Barioglio m. Barlou G. G. Barnaföldi L. s. Barnby V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova G. Bencedi s. Beole A. Bercuci Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. P. Bigot A. Bilandzic G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume G. Boca F. Bock T. Bodova A. Bogdanov s. Boi J. Bok L. Boldizsár m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo H. Bossi E. Botta Y. E. m. Bouziani L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno m. D. Buckland D. Budnikov H. Buesching s. Bufalino P. Buhler Z. Buthelezi A. Bylinkin s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho P. Camerini F. D. m. Canedo m. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos F. Catalano C. Ceballos sanchez I. Chakaberia P. Chakraborty s. Chandra s. Chapeland m. Chartier s. Chattopadhyay T. G. Chavez T. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. s. Chizzali J. Cho s. Cho P. Chochula P. Christakoglou C. H. Christe Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Fachbereich Informatik und Mathematik Johann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik Frankfurt Germany European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy INFN Sezione di Bologna Bologna Italy Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy University of Houston Houston Texas USA Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania Institut für Kernphysik Westfälische Wilhelms-Universität Münster Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH IMT Atlantique Nantes Université CNRS-IN2P3 Nantes France Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 Grenoble France Universidade de São Paulo (USP) São Paulo

The correlations between different moments of two flow amplitudes, extracted with the recently developed asymmetric cumulants, are measured in Pb-Pb collisions at sNN=5.02TeV recorded by the ALICE detector at the CERN Large Hadron Collider. The magnitudes of the measured observables show a dependence on the different moments as well as on the collision centrality, indicating the presence of nonlinear response in all even moments up to the eighth. Furthermore, the higher-order asymmetric cumulants show different signatures than the symmetric and lower-order asymmetric cumulants. Comparisons with state-of-the-art event generators using two different parametrizations obtained from Bayesian optimization show differences between data and simulations in many of the studied observables, indicating a need for further tuning of the models behind those event generators. These results provide new and independent constraints on the initial conditions and transport properties of the system created in heavy-ion collisions.

关键词： Hadron-hadron interactions Particle correlations & fluctuations Relativistic heavy-ion collisions

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multimuons in cosmic-ray events as seen in ALICE at the LHC

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Journal of Cosmology and Astroparticle physics 2025年第4期2025卷 009-009页

作者： Acharya, s. Agarwal, A. Aglieri Rinella, G. Aglietta, L. Agnello, m. Agrawal, N. Ahammed, Z. Ahmad, s. Ahn, s.U. Ahuja, I. Akindinov, A. Akishina, V. Al-Turany, m. Aleksandrov, D. Alessandro, B. Alfanda, H.m. Alfaro molina, R. Ali, B. Alici, A. Alizadehvandchali, N. Alkin, A. Alme, J. Alocco, G. Alt, T. Altamura, A.R. Altsybeev, I. Alvarado, J.R. Alvarez, C.O.R. Anaam, m.N. Andrei, C. Andreou, N. Andronic, A. Andronov, E. Anguelov, V. Antinori, F. Antonioli, P. Apadula, N. Aphecetche, L. Appelshäuser, H. Arata, C. Arcelli, s. Arnaldi, R. Arneiro, J.G.m.C.A. Arsene, I.C. Arslandok, m. Augustinus, A. Averbeck, R. Averyanov, D. Azmi, m.D. Baba, H. Badalà, A. Bae, J. Bae, Y. Baek, Y.W. Bai, X. Bailhache, R. Bailung, Y. Bala, R. Balbino, A. Baldisseri, A. Balis, B. Banoo, Z. Barbasova, V. Barile, F. Barioglio, L. Barlou, m. Barman, B. Barnaföldi, G.G. Barnby, L.s. Barreau, E. Barret, V. Barreto, L. Bartels, C. Barth, K. Bartsch, E. Bastid, N. Basu, s. Batigne, G. Battistini, D. Batyunya, B. Bauri, D. Bazo Alba, J.L. Bearden, I.G. Beattie, C. Becht, P. Behera, D. Belikov, I. Bell Hechavarria, A.D.C. Bellini, F. Bellwied, R. Belokurova, s. Beltran, L.G.E. Beltran, Y.A.V. Bencedi, G. Bensaoula, A. Beole, s. Berdnikov, Y. Berdnikova, A. Bergmann, L. Besoiu, m.G. Betev, L. Bhaduri, P.P. Bhasin, A. Bhattacharjee, B. Bianchi, L. Bielčík, J. Bielčíková, J. Bigot, A.P. Bilandzic, A. Biro, G. Biswas, s. Bize, N. Blair, J.T. Blau, D. Blidaru, m.B. Bluhme, N. Blume, C. Bock, F. Bodova, T. Bok, J. Boldizsár, L. Bombara, m. Bond, P.m. Bonomi, G. Borel, H. Borissov, A. Borquez Carcamo, A.G. Botta, E. Bouziani, Y.E.m. Bratrud, L. Braun-munzinger, P. Bregant, m. Broz, m. Bruno, G.E. Buchakchiev, V.D. Buckland, m.D. Budnikov, D. Buesching, H. Bufalino, s. Buhler, P. Burm.s.v, N. Buthelezi, Z. Bylinkin, A. Bysiak, s.A. Cabanillas Noris, J.C. Cabrera, m.F.T. Caines, H. Caliva, A. Calvo Villar, E. Camacho, J.m.m. Camerini, P. Canedo, F.D.m. Cantway, s.L. Carabas, m. Carballo, A.A. Carnesecchi, F. Caron, R. Carvalho, L.A.D. Castillo Castel A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation Yerevan Armenia AGH University of Krakow Cracow Poland Bogolyubov Institute for Theoretical Physics National Academy of Sciences of Ukraine Kiev Ukraine Bose Institute Department of Physics Centre for Astroparticle Physics and Space Science (CAPSS) Kolkata India California Polytechnic State University San Luis Obispo CA United States Central China Normal University Wuhan China Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN) Havana Cuba Centro de Investigación y de Estudios Avanzados (CINVESTAV) Mérida Mexico City Mexico Chicago State University Chicago IL United States China Institute of Atomic Energy Beijing China China University of Geosciences Wuhan China Chungbuk National University Cheongju South Korea Comenius University Bratislava Faculty of Mathematics Physics and Informatics Bratislava Slovakia Creighton University Omaha NE United States Department of Physics Aligarh Muslim University Aligarh India Department of Physics Pusan National University Pusan South Korea Department of Physics Sejong University Seoul South Korea Department of Physics University of California Berkeley CA United States Department of Physics University of Oslo Oslo Norway Department of Physics and Technology University of Bergen Bergen Norway Dipartimento di Fisica Università di Pavia Pavia Italy Dipartimento di Fisica dell’Università Sezione INFN Cagliari Italy Dipartimento di Fisica dell’Università Sezione INFN Trieste Italy Dipartimento di Fisica dell’Università Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Bologna Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Catania Italy Dipartimento di Fisica e Astronomia dell’Università Sezione INFN Padova Italy Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università Gruppo Collegato INFN Salerno Italy Dipartimento DISAT del Politecnico Sezione

ALICE is a large experiment at the CERN Large Hadron Collider. Located 52 meters underground, its detectors are suitable to measure muons produced by cosmic-ray interactions in the atm.s.here. In this paper, the studies of the cosmic muons registered by ALICE during Run 2 (2015–2018) are described. The analysis is limited to multimuon events defined as events with more than four detected muons (Nµsub> > 4) and in the zenith angle range 0◦sup> < θ < 50◦sup>. The results are compared with monte Carlo simulations using three of the main hadronic interaction models describing the air shower development in the atm.s.here: QGsJET-II-04, EPOs-LHC, and sIBYLL 2.3d. The interval of the primary cosmic-ray energy involved in the measured muon multiplicity distribution is about 4×1015sup> < Eprimsub> < 6×1016sup> eV. In this interval none of the three models is able to describe precisely the trend of the composition of cosmic rays as the energy increases. However, QGsJET-II-04 is found to be the only model capable of reproducing reasonably well the muon multiplicity distribution, assuming a heavy composition of the primary cosmic rays over the whole energy range, while sIBYLL 2.3d and EPOs-LHC underpredict the number of muons in a large interval of multiplicity by more than 20% and 30%, respectively. The rate of high muon multiplicity events (Nµsub> > 100) obtained with QGsJET-II-04 and sIBYLL 2.3d is compatible with the data, while EPOs-LHC produces a significantly lower rate (55% of the measured rate). For both QGsJET-II-04 and sIBYLL 2.3d, the rate is close to the data when the composition is assumed to be dominated by heavy elements, an outcome compatible with the average energy Eprimsub> ∼ 1017sup> eV of these events. This result places significant constraints on more exotic production mechanisms. © 2025 The Author(s).

关键词： cosmic ray experiments cosmic rays detectors

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Unveiling the complex correlation patterns in mrk 421 37

Unveiling the complex correlation patterns in Mrk 421

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37th International Cosmic Ray Conference, ICRC 2021

作者： Arbet-Engels, A. Paneque, D. Heckmann, L. Acciari, V.A. Ansoldi, s. Antonelli, L.A. Artero, m. Asano, K. Baack, D. Babić, A. Baquero, A. Barres de Almeida, U. Barrio, J.A. Batković, I. Becerra González, J. Bednarek, W. Bellizzi, L. Bernardini, E. Bernardos, m. Berti, A. Besenrieder, J. Bhattacharyya, W. Bigongiari, C. Biland, A. Blanch, O. Bökenkamp, H. Bonnoli, G. Bošnjak, Ž. Busetto, G. Carosi, R. Ceribella, G. Cerruti, m. Chai, Y. Chilingarian, A. Cikota, s. Colak, s.m. Colombo, E. Contreras, J.L. Cortina, J. Covino, s. D'Amico, G. D'Elia, V. Da Vela, P. Dazzi, F. De Angelis, A. De Lotto, B. Delfino, m. Delgado, J. Delgado mendez, C. Depaoli, D. Di Pierro, F. Di Venere, L. Do souto Espiñeira, E. Dominis Prester, D. Donini, A. Dorner, D. Doro, m. Elsaesser, D. Fallah Ramazani, V. Fattorini, A. Fonseca, m.V. Font, L. Fruck, C. Fukami, s. Fukazawa, Y. García López, R.J. Garczarczyk, m. Gasparyan, s. Gaug, m. Giglietto, N. Giordano, F. Gliwny, P. Godinović, N. Green, J.G. Green, D. Hadasch, D. Hahn, A. Herrera, J. Hoang, J. Hrupec, D. Hütten, m. Inada, T. Ishio, K. Iwamura, Y. Jiménez martínez, I. Jormanainen, J. Jouvin, L. Karjalainen, m. Kerszberg, D. Kobayashi, Y. Kubo, H. Kushida, J. Lam.s.ra, A. Lelas, D. Leone, F. Lindfors, E. Linhoff, L. Lombardi, s. Longo, F. López-Coto, R. López-moya, m. López-Oram.s. A. Loporchio, s. machado de Oliveira Fraga, B. maggio, C. majumdar, P. makariev, m. mallamaci, m. maneva, G. manganaro, m. mannheim, K. maraschi, L. mariotti, m. martínez, m. mazin, D. menchiari, s. mender, s. mićanović, s. miceli, D. miener, T. miranda, J.m. mirzoyan, R. molina, E. moralejo, A. morcuende, D. moreno, V. moretti, E. Nakamori, T. Nava, L. Neustroev, V. Nigro, C. Nilsson, K. Nishijima, K. Noda, K. Nozaki, s. Ohtani, Y. Oka, T. Otero-santos, J. Paiano, s. Palatiello, m. Paoletti, R. Paredes, J.m. Pavletić, L. Peñil, P. Persic, m. Pihet, m. Prada moroni, P.G. Prandini, E. Priyadarshi, C. Puljak, I. Rhode, W. Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Lagu Tenerife La LagunaE-38200 Spain Università di Udine INFN Trieste UdineI-33100 Italy RomeI-00136 Italy Barcelona BellaterraE-08193 Spain The University of Tokyo Chiba Kashiwa277-8582 Japan Technische Universität Dortmund DortmundD-44221 Germany Zagreb10000 Croatia IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain URCA RJ Rio de Janeiro22290-180 Brazil Università di Padova INFN PadovaI-35131 Italy University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Università di Siena INFN Pisa SienaI-53100 Italy ZeuthenD-15738 Germany Max-Planck-Institut für Physik MünchenD-80805 Germany Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain Università di Pisa INFN Pisa PisaI-56126 Italy Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 Spain Armenian MAGIC Group A. Alikhanyan National Science Laboratory Yerevan0036 Armenia Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica Università e del Politecnico di Bari BariI-70125 Italy Croatian MAGIC Group University of Rijeka Department of Physics Rijeka51000 Croatia Finnish MAGIC Group Finnish Centre for Astronomy with ESO University of Turku TurkuFI-20014 Finland Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Japanese MAGIC Group: Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan Armenian MAGIC Group: ICRANet-Armenia at NAS RA Yerevan0019 Armenia Split21000 Croatia Croatian MAGIC Group Josip Juraj Strossmayer University of Osijek Department o

The blazar mrk 421 (redshift z = 0.031) is one of the brightest and closest BL Lac type objects, making it an ideal target to probe blazar physics. We report on an extensive multi-wavelength observing campaign in 2017, during which the intra-band correlation patterns show some disparity and complex behaviours. Observations from.s.veral instruments are used to achieve an optimal temporal coverage from radio to TeV energies. In particular, four multi-hour NusTAR observations organised simultaneously with mAGIC allow to obtain a precise measurement of the falling segments of the two spectral components. A detailed investigation of the very-high-energy (VHE;> 100 GeV) versus X-ray flux correlation is performed, by binning the data into several sub-energy bands. A positively correlated variability is observed, but the correlation characteristics change substantially across the various bands probed. Furthermore, during the simultaneous mAGIC and NusTAR observations a clear change of the Compton dominance is detected without a simultaneous change in the synchrotron regime, indicating "orphan gamma-ray activity". We also investigate an intriguing bright flare at VHE without a substantial flux increase in the X-rays. Within a leptonic scenario, this behaviour is best explained by the appearance of a second population of highly-energetic electrons spanning a narrow range of energies. Finally, our multi-wavelength correlation study also reveals an anti-correlation between the UV/optical and X-ray bands at a significance level above 3σ. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Gamma rays

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Proton em.s.ion in ultraperipheral Pb-Pb collisions at sNN=5.02 TeV

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Physical Review C 2025年第5期111卷 054906-054906页

作者： s. Acharya A. Agarwal G. Aglieri Rinella L. Aglietta m. Agnello N. Agrawal Z. Ahammed s. Ahmad s. U. Ahn I. Ahuja A. Akindinov V. Akishina m. Al-Turany D. Aleksandrov B. Alessandro H. m. Alfanda R. Alfaro molina B. Ali A. Alici N. Alizadehvandchali A. Alkin J. Alme G. Alocco T. Alt A. R. Altamura I. Altsybeev J. R. Alvarado C. O. R. Alvarez m. N. Anaam C. Andrei N. Andreou A. Andronic E. Andronov V. Anguelov F. Antinori P. Antonioli N. Apadula L. Aphecetche H. Appelshäuser C. Arata s. Arcelli R. Arnaldi J. G. m. C. A. Arneiro I. C. Arsene m. Arslandok A. Augustinus R. Averbeck D. Averyanov m. D. Azmi H. Baba A. Badalà J. Bae Y. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung R. Bala A. Baldisseri B. Balis Z. Banoo V. Barbasova F. Barile L. Barioglio m. Barlou B. Barman G. G. Barnaföldi L. s. Barnby E. Barreau V. Barret L. Barreto C. Bartels K. Barth E. Bartsch N. Bastid s. Basu G. Batigne D. Battistini B. Batyunya D. Bauri J. L. Bazo Alba I. G. Bearden C. Beattie P. Becht D. Behera I. Belikov A. D. C. Bell Hechavarria F. Bellini R. Bellwied s. Belokurova L. G. E. Beltran Y. A. V. Beltran G. Bencedi A. Bensaoula s. Beole Y. Berdnikov A. Berdnikova L. Bergmann m. G. Besoiu L. Betev P. P. Bhaduri A. Bhasin B. Bhattacharjee L. Bianchi J. Bielčík J. Bielčíková A. P. Bigot A. Bilandzic A. Binoy G. Biro s. Biswas N. Bize J. T. Blair D. Blau m. B. Blidaru N. Bluhme C. Blume F. Bock T. Bodova J. Bok L. Boldizsár m. Bombara P. m. Bond G. Bonomi H. Borel A. Borissov A. G. Borquez Carcamo E. Botta Y. E. m. Bouziani D. C. Brandibur L. Bratrud P. Braun-munzinger m. Bregant m. Broz G. E. Bruno V. D. Buchakchiev m. D. Buckland D. Budnikov H. Buesching s. Bufalino P. Buhler N. Burm.s.v Z. Buthelezi A. Bylinkin s. A. Bysiak J. C. Cabanillas Noris m. F. T. Cabrera H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho P. Camerini F. D. m. Canedo s. L. Cantway m. Carabas A. A. Carballo F. Carnesecchi R. Caron L. A. D. Carvalho J. Castillo Castellanos m. Castoldi F. Catalano s. Cattaruzzi R. Cerri I. Chakaberia P. Chakraborty s. Chandra Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India European Organization for Nuclear Research (CERN) Geneva Switzerland Dipartimento di Fisica dell'Università and Sezione INFN Turin Italy Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN Bologna Italy Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science P.J. Šafárik University Košice Slovak Republic Affiliated with an institute covered by a cooperation agreement with CERN Frankfurt Institute for Advanced Studies Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany Research Division and ExtreMe Matter Institute EMMI GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt Germany INFN Sezione di Torino Turin Italy Central China Normal University Wuhan China Instituto de Física Universidad Nacional Autónoma de México Mexico City Mexico University of Houston Houston Texas USA Sungkyunkwan University Suwon City Republic of Korea Department of Physics and Technology University of Bergen Bergen Norway INFN Sezione di Cagliari Cagliari Italy Institut für Kernphysik Johann Wolfgang Goethe-Universität Frankfurt Frankfurt Germany INFN Sezione di Bari Bari Italy Physik Department Technische Universität München Munich Germany High Energy Physics Group Universidad Autónoma de Puebla Puebla Mexico Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania University of Derby Derby United Kingdom Universität Münster Institut für Kernphysik Münster Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany INFN Sezione di Padova Padova Italy INFN Sezione di Bologna Bologna Italy Lawrence Berkeley National Laboratory Berkeley California USA SUBATECH I

The first measurements of proton em.s.ion accompanied by neutron em.s.ion in the electromagnetic dissociation (EmD) of Pb208 nuclei in the ALICE experiment at the Large Hadron Collider are presented. The EmD protons and neutrons emitted at very forward rapidities are detected by the proton and neutron zero degree calorimeters of the ALICE experiment. The em.s.ion cross sections of zero, one, two, and three protons accompanied by at least one neutron were measured in ultraperipheral Pb208−Pb208 collisions at a center-of-m.s. energy per nucleon pair sNN=5.02TeV. The 0p and 3p cross sections are described by the RELDIs model within their measurement uncertainties, while the 1p and 2p cross sections are underestimated by the model by 17–25%. According to this model, these 0p, 1p, 2p, and 3p cross sections are associated, respectively, with the production of various isotopes of Pb, Tl, Hg, and Au in the EmD of Pb208. The cross sections of the em.s.ion of a single proton accompanied by the em.s.ion of one, two, or three neutrons in EmD were also measured. The data are significantly overestimated by the RELDIs model, which predicts that the (1p,1n), (1p,2n), and (1p,3n) cross sections are very similar to the cross sections for the production of the thallium isotopes Tl206,205,204.

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Correction to: Environmental consequences of interacting effects of changes in stratospheric ozone, ultraviolet radiation, and climate: UNEP Environmental Effects Assessment Panel, Update 2024 (Photochemical & Photobiological sciences, (2025), 24, 3, (357-392), 10.1007/s43630-025-00687-x)

引用

Photochemical and Photobiological sciences 2025年第5期24卷 863-865页

作者： Neale, Patrick J. Hylander, samuel Banaszak, Anastazia T. Häder, Donat-P. Rose, Kevin C. Vione, Davide Wängberg, sten-Åke Jansen, marcel A. K. Busquets, Rosa Andersen, mads P. sulbæk madronich, sasha Hanson, mark L. schikowski, Tamara solomon, Keith R. sulzberger, Barbara Wallington, Timothy J. Heikkilä, Anu m. Pandey, Krishna K. Andrady, Anthony L. Bruckman, Laura s. White, Christopher C. Zhu, Liping Bernhard, Germar H. Bais, Alkiviadis Aucamp, Pieter J. Chiodo, Gabriel Cordero, Raúl R. Petropavlovskikh, Irina Neale, Rachel E. Olsen, Catherine m. Hales, simon Lal, Aparna Lingham, Gareth Rhodes, Lesley E. Young, Antony R. Robson, T. matthew Robinson, sharon A. Barnes, Paul W. Bornman, Janet F. Harper, Anna B. Lee, Hanna Calderón, Roy mackenzie Ossola, Rachele Paul, Nigel D. Revell, Laura E. Wang, Qing-Wei Zepp, Richard G. Environmental Research Center Smithsonian Institution EdgewaterMD United States Centre for Ecology and Evolution in Microbial Model Systems Linnaeus University Kalmar Sweden Unidad Académica de Sistemas Arrecifales Universidad Nacional Autónoma de México Puerto Morelos Mexico Erlangen Germany Department of Biological Sciences and Department of Civil and Environmental Engineering Rensselaer Polytechnic Institute TroyNY United States Department of Chemistry University of Turin Turin Italy Department of Marine Sciences University of Gothenburg Gotheburg Sweden School of Biological Earth and Environmental Sciences Environmental Research Institute University College Cork Cork Ireland Chemical and Pharmaceutical Sciences Kingston University London Kingston Upon Thames United Kingdom Civil Environmental & Geomatic Engineering University College London London United Kingdom Department of Chemistry and Biochemistry California State University NorthridgeCA United States Atmospheric Chemistry Observations and Modeling National Center for Atmospheric Research BoulderCO United States USDA UV-B Monitoring and Research Program Colorado State University Fort. CollinsCO United States Department of Environment and Geography University of Manitoba WinnipegMB Canada Working Group Environmental Epidemiology IUF-Leibniz Research Institute for Environmental Medicine Düsseldorf Germany Department of Environment and Health School of Public Health University of Bielefeld Bielefeld Germany School of Environmental Sciences University of Guelph GuelphON Canada Retired From Eawag Swiss Federal Institute of Aquatic Science and Technology Dübendorf Switzerland Center for Sustainable Systems School for Environment and Sustainability University of Michigan Ann ArborMI United States Climate Research Finnish Meteorological Institute Helsinki Finland Indian Academy of Wood Science Bengaluru India Chemical and Biomolecular Engineering North Carolina State University RaleighN

This work is not a product of the U.s. Government or the U.s. Environmental Protection Agency, and the author is not doing this work in any governmental capacity. This research was not performed or funded by EPA and was not subject to EPA’s quality system requirements. The views expressed in this journal article are those of the author(s) and do not necessarily represent the views or the policies of the U.s. Environmental Protection Agency. The original article has been corrected. © The Author(s), under exclusive licence to the European Photochem.s.ry Association, European society for Photobiology 2025.

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