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measurement of Ωc0 baryon production and branching-fraction ratio BR(Ωc0→Ω−e+νe)/BR(Ωc0→Ω−π+) in pp collisions at s=13 TeV

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Physical Review D 2024年第3期110卷 032014-032014页

作者： s. Acharya D. Adamová 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 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 m. Aresti R. Arnaldi J. G. m. C. A. Arneiro I. C. Arsene m. Arslandok A. Augustinus R. Averbeck m. D. Azmi H. Baba A. Badalà J. Bae Y. W. Baek X. Bai R. Bailhache Y. Bailung R. Bala A. Balbino A. Baldisseri B. Balis D. Banerjee 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 N. Bianchi J. Bielčík J. Bielčíková 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 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 N. Burm.s.v Z. Buthelezi A. Bylinkin s. A. Bysiak J. C. Cabanillas Noris m. F. T. Cabrera m. Cai 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 C. Ceballos sanchez R. Cerri I. Chakaberia P. Chak Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India Geneva Switzerland Dipartimento di Fisica dell’Università Turin Italy Sezione INFN Turin Italy Dipartimento DISAT del Politecnico and Sezione INFN Turin Italy Dipartimento di Fisica e Astronomia dell’Università Bologna Italy 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 Berkel

The inclusive production of the charm.s.range baryon Ωc0 is measured for the first time via its semileptonic decay into Ω−e+νe at midrapidity (|y|<0.8) in proton-proton (pp) collisions at the center-of-m.s. energy s=13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2s measured to be 1.12±0.22 (stat) ±0.27 (syst). Comparisons with other experimental measurements, as well as with theoretical calculations, are presented.

关键词： Branching fraction Hadron production Charmed baryons

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system.s.ze dependence of the hadronic rescattering effect at energies available at the CERN Large Hadron Collider

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Physical Review C 2024年第1期109卷 014911-014911页

作者： s. Acharya D. Adamová 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 A. R. Altamura I. Altsybeev J. R. Alvarado m. N. Anaam C. Andrei N. Andreou 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 H. Baba 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 B. Barman 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 Y. A. V. Beltran G. Bencedi s. Beole 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 N. Burm.s.v 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 s. L. Cantway 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. Cheng C. Cheshkov B. Cheynis V. Chibante Barroso D. D. Chinellato E. Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Nuclear Physics Institute of the Czech Academy of Sciences Husinec-Řež Czech Republic 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 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 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 CN

The first measurements of K*(892)0 resonance production as a function of charged-particle multiplicity in Xe-Xe collisions at sNN=5.44 TeV and pp collisions ats=5.02 TeV using the ALICE detector are presented. The resonance is reconstructed at midrapidity (|y| < 0.5) using the hadronic decay channel K*0 →K±π∓. measurements of transverse-momentum integrated yield, mean transverse-momentum, nuclear modification factor of K*0, and yield ratios of resonance to stable hadron (K*0/K) are compared across different collision systems (pp, p-Pb, Xe-Xe, and Pb-Pb) at similar collision energies to investigate how the production of K*0 resonances depends on the size of the system formed in these collisions. The hadronic rescattering effect is found to be independent of the size of colliding systems and mainly driven by the produced charged-particle multiplicity, which is a proxy of the volume of produced matter at the chemical freeze-out. In addition, the production yields of K*0 in Xe-Xe collisions are utilized to constrain the dependence of the kinetic freeze-out temperature on the system.s.ze using the hadron resonance gas–partial chemical equilibrium model.

关键词： Hadron-hadron interactions Particle & resonance production Relativistic heavy-ion collisions

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K*(892)± resonance production in Pb-Pb collisions at sNN=5.02 TeV

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Physical Review C 2024年第4期109卷 044902-044902页

The production of K*(892)± m.s.n resonance is measured at midrapidity (|y|8 GeV/c, consistent with measurements for other light-flavored hadrons. The smallest values are observed in m.s. central collisions, indic... 详细信息

The production of K*(892)± m.s.n resonance is measured at midrapidity (|y|<0.5) in Pb−Pb collisions at sNN=5.02 TeV using the ALICE detector at the CERN Large Hadron Collider. The resonance is reconstructed via its hadronic decay channel K*(892)±→Ks0π±. The transverse momentum distributions are obtained for various centrality intervals in the pT range of 0.4−16 GeV/c. measurements of integrated yields, mean transverse momenta, and particle yield ratios are reported and found to be consistent with previous ALICE measurements for K*(892)0 within uncertainties. The pT-integrated yield ratio 2K*(892)±/(K++K−) in central Pb−Pb collisions shows a significant suppression at a level of 9.3σ relative to pp collisions. Thermal model calculations result in an overprediction of the particle yield ratio. Although both hadron resonance gas in partial chemical equilibrium (HRG-PCE) and m.s.c + sm.s. simulations consider the hadronic phase, only HRG-PCE accurately represents the measurements, whereas m.s.c + sm.s. simulations tend to overpredict the particle yield ratio. These observations, along with the kinetic freeze-out temperatures extracted from the yields measured for light-flavored hadrons using the HRG-PCE model, indicate a finite hadronic phase lifetime, which decreases with increasing collision centrality percentile. The pT-differential yield ratios 2K*(892)±/(K++K−) and 2K*(892)±/(π++π−) are presented and compared with measurements in pp collisions at s=5.02 TeV. Both particle ratios are found to be suppressed by up to a factor of five at pT<2.0 GeV/c in central Pb−Pb collisions and are qualitatively consistent with expectations for rescattering effects in the hadronic phase. The nuclear modification factor (RAA) shows a smooth evolution with centrality and is found to be below unity at pT>8 GeV/c, consistent with measurements for other light-flavored hadrons. The smallest values are observed in m.s. central collisions, indicating larger energy loss of partons traversin

关键词： Hadron-hadron interactions Particle & resonance production Relativistic heavy-ion collisions

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measurements of Groomed-Jet substructure of Charm Jets Tagged by D0 m.s.ns in Proton-Proton Collisions at s=13 TeV

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Physical Review Letters 2023年第19期131卷 192301-192301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 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 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. Christakoglou C. H. Christensen P. Christ 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 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

Understanding the role of parton m.s. and Casimir color factors in the quantum chromodynamics parton shower represents an important step in characterizing the em.s.ion properties of heavy quarks. Recent experimental advances in jet substructure techniques have provided the opportunity to isolate and characterize gluon em.s.ions from heavy quarks. In this Letter, the first direct experimental constraint on the charm-quark splitting function is presented, obtained via the measurement of the groomed shared momentum fraction of the first splitting in charm jets, tagged by a reconstructed D0 m.s.n. The measurement is made in proton-proton collisions at s=13 TeV, in the low jet transverse-momentum interval of 15≤pTjet ch<30 GeV/c where the em.s.ion properties are sensitive to parton m.s. effects. In addition, the opening angle of the first perturbative em.s.ion of the charm quark, as well as the number of perturbative em.s.ions it undergoes, is reported. Comparisons to measurements of an inclusive-jet sample show a steeper splitting function for charm quarks compared with gluons and light quarks. Charm quarks also undergo fewer perturbative em.s.ions in the parton shower, with a reduced probability of large-angle em.s.ions.

关键词： Quark & gluon jets

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Unveiling two deeply embedded young protostars in the s68N Class 0 protostellar core with JWsT/NIRspec

arXiv

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arXiv 2024年

作者： Le Gouellec, Valentin J.m. Lew, Ben W.P. Greene, Thom.s.P. Johnstone, Doug Gusdorf, Antoine Francis, Logan DeWitt, Curtis meyer, michael Tychoniec, Lukasz van Dishoeck, Ewine F. Barsony, mary Hodapp, Klaus W. Robberto, m.s.imo NASA Ames Research Center Space Science and Astrobiology Division M.S. 245-6 Moffett FieldCA94035 United States NASA Postdoctoral Program Fellow United States Bay Area Environmental Research Institute Moffett FieldCA94035 United States NRC Herzberg Astronomy and Astrophysics 5071 West Saanich Rd VictoriaBCV9E 2E7 Canada Department of Physics and Astronomy University of Victoria VictoriaBCV8P 5C2 Canada Laboratoire de Physique de l’École Normale Supérieure ENS Université PSL CNRS Sorbonne Université Université Paris Cité ParisF-75005 France Observatoire de Paris PSL University Sorbonne Université LERMA Paris75014 France Leiden Observatory Leiden University PO Box 9513 Leiden2300RA Netherlands Space Science Institute BoulderCO80301 United States Department of Astronomy University of Michigan Ann ArborMI48109 United States 13115 Dupont Road SebastopolCA95472 United States University of Hawaii Institute for Astronomy 640 N. Aohoku Place HiloHI96720 United States Space Telescope Science Institute 3700 San Martin Drive BaltimoreMD21218 United States Department of Physics & Astronomy Johns Hopkins University 3400 N. Charles Street BaltimoreMD21218 United States

The near-infrared (NIR) em.s.ion of the youngest protostars still needs to be characterized to better understand the evolution of their accretion and ejection activity. We analyze Jam.s.Webb space Telescope NIRspec 1.7—5.3 µm observations of two deeply embedded sources in the s68N protostellar core in serpens. The North Central (NC) source exhibits a highly obscured spectrum (AK ∼ 4.8 mag) that is modeled with a pre-main-sequence photosphere and a hot disk component. The photospheric parameters are consistent with a young, low-m.s. photosphere, as suggested by the low surface gravity, log g of 1.94 ± 0.15 cm.s.2. The hot disk suggests that accretion onto the central protostellar embryo is ongoing, although prototypical accretion-tracing em.s.ion lines H I are not detected. The south Central (sC) source, which is even more embedded (AK ∼ 8 mag;no continuum is detected shortward of 3.6 µm) appears to be driving the large-scale s68N protostellar outflow, and launches a collimated hot molecular jet detected in H2 and CO ro-vibrational lines. shock modeling of the H2 (ro)vibrational lines establishes that fast C-type shocks (≥ 30 km.s.1), with high pre-shock density (≥ 107 cm−3), and strong magnetic field (b ∼ 3–10, where B = b × pnH(cm−3) µG) best match the data. The bright CO fundamental line forest suggests energetic excitation, with the contribution of non-LTE effects, i.e., irradiation pumping. Detected OH and CH+ ro-vibrational lines support this hypothesis. These two Class 0 protostars seem to be in very young evolutionary stages and still have to acquire the bulk of their final stellar m.s.es. These results demonstrate that JWsT enables unprecedented diagnostics of these first stages of the protostellar evolutionary phase. © 2024, CC BY.

关键词： space telescopes

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The broadband 3-year monitoring of the blazar 1Es 1959+650: a sED analysis of the low state

The broadband 3-year monitoring of the blazar 1ES 1959+650: ...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Nanci, Cristina Nigro, Cosimo Arcaro, Cornelia Prandini, Elisa Dorner, Daniela Zanin, Roberta Arbet-Engels, Axel Rosillo, mireia Nievas D'Ammando, Filippo Bronzini, Ettore sakurai, shunsuke Abe, H. Abe, s. Abhir, J. Acciari, V.A. Agudo, I. Aniello, T. Ansoldi, s. Antonelli, L.A. Arbet Engels, A. Arcaro, C. Artero, m. Asano, K. Baack, D. Babic, A. Baquero, A. de Almeida, U. Barres Barrio, J.A. Batkovic, I. Baxter, J. Becerra González, J. Bednarek, W. Bernardini, E. Bernardos, m. Bernete, J. Berti, A. Besenrieder, J. Bigongiari, C. Biland, A. Blanch, O. Bonnoli, G. Bošnjak, Z. Bronzini, E. Burelli, I. Busetto, G. Campoy-Ordaz, A. Carosi, A. Carosi, R. Carretero-Castrillo, m. Castro-Tirado, A.J. Ceribella, G. Chai, Y. Chilingarian, A. Cifuentes, A. Cikota, s. Colombo, E. Contreras, J.L. Cortina, J. Covino, s. D'Amico, G. D'Ammando, F. D'Elia, V. Da Vela, P. Dazzi, F. De Angelis, A. De Lotto, B. Del Popolo, A. Delfino, m. Delgado, J. Delgado mendez, C. Depaoli, D. Di Pierro, F. Di Venere, L. Dominis Prester, D. Donini, A. Dorner, D. Doro, m. Elsaesser, D. Emery, G. Escudero, J. Fariña, L. Fattorini, A. Foffano, L. Font, L. Fröse, s. Fukami, s. Fukazawa, Y. García López, R.J. Garczarczyk, m. Gasparyan, s. Gaug, m. Giesbrecht Paiva, J.G. Giglietto, N. Giordano, F. Gliwny, P. Godinovic, N. Grau, R. Green, D. Green, J.G. Hadasch, D. Hahn, A. Hassan, T. Heckmann, L. Herrera, J. Hrupec, D. Hütten, m. Imazawa, R. Inada, T. Iotov, R. Ishio, K. Jiménez martínez, I. Jormanainen, J. Kerszberg, D. Kluge, G.W. Kobayashi, Y. Kouch, P.m. Kubo, H. Kushida, J. Láinez Lezáun, m. 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. Lorini, A. Lyard, E. machado de Oliveira Fraga, B. majumdar, P. makariev, m. maneva, G. mang, N. manganaro, m. mangano, s. mannheim, K. mariotti, m. martínez, m. martínezChicharro, m. m.s.Aguilar, A. mazin, D. menchiari, s. mender, s. micanovic, s. miceli, D. miener, T. miranda, J.m. The University of Tokyo Kashiwa Chiba277-8582 Japan ETH Zürich ZürichCH-8093 Switzerland Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38200 Spain Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain RomeI-00136 Italy Università di Udine INFN Trieste UdineI- 33100 Italy Max-Planck-Institut für Physik MünchenD-80805 Germany Università di Padova INFN PadovaI-35131 Italy Bellaterra BarcelonaE-08193 Spain Technische Universität Dortmund DortmundD-44221 Germany Zagreb10000 Croatia IPARCOS Institute and EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain Rio de Janeiro22290-180 Brazil University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain Departament de Física CERES-IEEC Universitat Autònoma de Barcelona Bellaterra E-08193 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 Department for Physics and Technology University of Bergen Norway INFN MAGIC Group INFN Sezione di Catania Dipartimento di Fisica e Astronomia University of Catania CataniaI-95123 Italy 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 dell'Università e del Politecnico di Bari BariI-70125 Italy Croatian MAGIC Group University of Rijeka Faculty of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany University of Geneva Chemin d'Ecogia 16 VersoixCH-1290 Switzerland Japanese MAGIC Group Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan Zeuthe

Blazars' spectral Energy Distribution (sED) consists of two components. In a leptonic interpretation, the low-energy bump is due to synchrotron radiation from accelerated electrons while the high-energy one is produced via inverse Compton scattering of the electrons by lower-energy photons. These come from the synchrotron radiation produced by the same population of electrons emitting at low energy (synchrotron self-Compton, ssC, scenario) or from an external photon field. According to hadronic models, the high-energy em.s.ion is due to processes involving the protons in the source. multiwavelength (mWL) long-term monitoring of blazars is key since the sED modelling over time allows the study of the radiative processes during different source states. The blazar 1Es 1959+650 represents an ideal laboratory for that, being bright at all wavelengths and located at low redshift (z=0.047) allowing its detection up to TeV energies. Also, it underwent some flaring episodes in the past. Long-term monitoring of 1Es 1959+650 is ongoing under the coordination of the mAGIC Collaboration. During the last years, the source is experiencing its lowest state ever reached, mainly at very high energies (VHE;E > 100 GeV). This contribution presents the mAGIC+mWL observations of the last 3 years, and the preliminary study focusing on an ssC interpretation of the data. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： synchrotron radiation

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Characterizing magnetic Properties of Young Protostars in Orion

arXiv

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arXiv 2025年

作者： Huang, Bo Girart, Josep m. stephens, Ian W. myers, Philip C. Zhang, Qizhou Cortes, Paulo sánchez-monge, Álvaro Fernández-López, manuel Le Gouellec, Valentin J.m. megeath, Tom murillo, Nadia m. Carpenter, John m. Li, Zhi-Yun Liu, Junhao Looney, Leslie W. sadavoy, sarah Karnath, Nicole Kwon, Woojin Campus UAB Can Magrans S/N Catalonia Cerdanyola del VallèsE-08193 Spain Campus del Baix Llobregat UPC Esteve Terradas 1 Catalonia CastelldefelsE-08860 Spain Department of Earth Environment and Physics Worcester State University WorcesterMA01602 United States Center for Astrophysics | Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States National Radio Astronomy Observatory 520 Edgemont Rd. CharlottesvilleVA22093 United States Joint ALMA Observatory Alonso de Córdova 3107 Vitacura Santiago Chile c/Gran Capita 2-4 Catalonia BarcelonaE-08034 Spain Instituto Argentino de Radioastronomía CCT-La Plata CONICET CICPBA C.C. No. 5 Buenos Aires Villa Elisa1894 Argentina NASA Ames Research Center Space Science and Astrobiology Division M.S. 245-6 Moffett FieldCA94035 United States NASA Postdoctoral Program Fellow United States Department of Astronomy University of Toledo ToledoOH43606 United States Instituto de Astronomía Universidad Nacional Autónoma de México AP106 B. C. EnsenadaCP 22830 Mexico Star and Planet Formation Laboratory RIKEN Cluster for Pioneering Research Saitama Wako351-0198 Japan Joint ALMA Observatory Av. Alonso de Córdova 3107 Vitacura Santiago Chile Astronomy Department University of Virginia CharlottesvilleVA22904 United States National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Astronomy University of Illinois 1002 West Green Street UrbanaIL61801 United States Department of Physics Engineering and Astronomy Queen’s University 64 Bader Lane KingstonONK7L 3N6 Canada Space Science Institute 4765 Walnut St Suite B BoulderCO80301 United States Department of Earth Science Education Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of SNU Astronomy Research Center Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of The Center for Educational Research Seoul National University 1 Gwa

The B-field Orion Protostellar survey (BOPs) recently obtained polarimetric observations at 870 µm towards 61 protostars in the Orion molecular clouds with ∼ 1′′ spatial resolution using the Atacama Large millimeter/submillimeter Array. From the BOPs sample, we selected the 26 protostars with extended polarized em.s.ion within a radius of ∼ 6′′ (2400 au) around the protostar. This allows to have sufficient statistical polarization data to infer the magnetic field strength. The magnetic field strength is derived using the Davis-Chandrasekhar-Fermi method. The underlying magnetic field strengths are approximately 2.0 mG for protostars with a standard hourglass magnetic field morphology, which is higher than the values derived for protostars with rotated hourglass, spiral, and complex magnetic field configurations ( 1.0 mG). This suggests that the magnetic field plays a more significant role in envelopes exhibiting a standard hourglass field morphology, and a value of 2.0 mG would be required to maintain such a structure at these scales. Furthermore, m.s. protostars in the sample are slightly supercritical, with m.s.-to-flux ratios 3.0. In particular, the m.s.-to-flux ratios for all protostars with a standard hourglass magnetic field morphology are lower than 3.0. However, these ratios do not account for the contribution of the protostellar m.s., which means they are likely significantly underestimated. Copyright © 2025, The Authors. All rights reserved.

关键词： stars

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measurement of the J/ψ Polarization with Respect to the Event Plane in Pb-Pb Collisions at the LHC

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Physical Review Letters 2023年第4期131卷 042303-042303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 s. Arcelli R. Arnaldi I. C. Arsene m. Arslandok A. Augustinus R. Averbeck s. Aziz 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 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 I. R. Bhat m. A. Bhat B. Bhattacharjee L. Bianchi N. Bianchi J. Bielčík J. Bielčíková J. Biernat A. Bilandzic G. Biro s. Biswas 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 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 A. Bylinkin s. A. Bysiak m. Cai H. Caines A. Caliva E. Calvo Villar J. m. m. Camacho R. s. Camacho P. Camerini F. D. m. Canedo m. Carabas 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. Christakoglou C. H. Christensen P. Christiansen T. Chujo m. Cia Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Variable Energy Cyclotron Centre Homi Bhabha National Institute Kolkata India 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 Department of Physics Aligarh Muslim University Aligarh India Korea Institute of Science and Technology Information Daejeon Republic of Korea Faculty of Science Pavol Jozef 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 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 Munster 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 Department of Physics University of Oslo Oslo Norway Yale University New Haven Connecticut

We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sNN=5.02 TeV at the LHC in the dimuon channel, via the measurement of the angular distribution of its decay products. We perform the study in the rapidity region 2.5sverse momentum intervals (2s a function of the centrality of the collision for 2st time, the polarization is measured with respect to the event plane of the collision, by considering the angle between the positive-charge decay muon in the J/ψ rest frame and the axis perpendicular to the event-plane vector in the laboratory system. A small transverse polarization is measured, with a significance reaching 3.9σ at low pT and for intermediate centrality values. The polarization could be connected with the behavior of the quark-gluon plasma, formed in Pb-Pb collisions, as a rotating fluid with large vorticity, as well as with the existence of a strong magnetic field in the early stage of its formation.

关键词： Collective flow Relativistic heavy-ion collisions Quarkonia

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On the magnetic field properties of protostellar envelopes in Orion

arXiv

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arXiv 2024年

作者： Huang, Bo Girart, Josep m. stephens, Ian W. Fernández López, manuel Arce, Hector G. Carpenter, John m. Cortes, Paulo Cox, Erin G. Friesen, Rachel Le Gouellec, Valentin J.m. Hull, Charles L.H. Karnath, Nicole Kwon, Woojin Li, Zhi-Yun Looney, Leslie W. megeath, Tom myers, Philip C. murillo, Nadia m. Pineda, Jaime E. sadavoy, sarah sánchez-monge, Álvaro sanhueza, Patricio Tobin, John J. Zhang, Qizhou Jackson, Jam.s.m. segura-Cox, Dominique Campus UAB Can Magrans S/N Catalonia Cerdanyola del VallèsE-08193 Spain c/Gran Capita 2-4 Catalonia BarcelonaE-08034 Spain Department of Earth Environment and Physics Worcester State University WorcesterMA01602 United States Instituto Argentino de Radioastronomía CCT-La Plata CONICET CICPBA C.C. No. 5 Buenos Aires Villa Elisa1894 Argentina Department of Astronomy Yale University New HavenCT06511 United States Joint ALMA Observatory Av. Alonso de Córdova 3107 Santiago Vitacura Chile National Radio Astronomy Observatory 520 Edgemont Rd. CharlottesvilleVA22093 United States 1800 Sherman Avenue EvanstonIL60201 United States Department of Astronomy & Astrophysics University of Toronto 50 St. George St. TorontoONM5S 3H4 Canada NASA Ames Research Center Space Science and Astrobiology Division M.S. 245-6 Moffett Field CA94035 United States National Astronomical Observatory of Japan Alonso de Córdova 3788 Santiago VitacuraOffice 61B Chile SOFIA Science Center Universities Space Research Association NASA Ames Research Center Moffett Field CA94035 United States Space Science Institute 4765 Walnut St Suite B BoulderCO80301 United States Center for Astrophysics | Harvard & Smithsonian 60 Garden Street CambridgeMA02138 United States Department of Earth Science Education Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of SNU Astronomy Research Center Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of Astronomy Department University of Virginia CharlottesvilleVA22904 United States Department of Astronomy University of Illinois 1002 West Green Street UrbanaIL61801 United States Department of Astronomy University of Toledo ToledoOH43606 United States Instituto de Astronomía Universidad Nacional Autónoma de México AP106 B. C. EnsenadaCP 22830 Mexico Star and Planet Formation Laboratory RIKEN Cluster for Pioneering Research Saitama Wako351-0198 Japan Center

We present 870 µm polarimetric observations toward 61 protostars in the Orion molecular clouds, with ∼400 au (1′′) resolution using the Atacama Large millimeter/submillimeter Array. We successfully detect dust polarization and outflow em.s.ion in 56 protostars, in 16 of them the polarization is likely produced by self-scattering. self-scattering signatures are seen in several Class 0 sources, suggesting that grain growth appears to be significant in disks at earlier protostellar phases. For the rest of the protostars, the dust polarization traces the magnetic field, whose morphology can be approximately classified into three categories: standard-hourglass, rotated-hourglass (with its axis perpendicular to outflow), and spiral-like morphology. 40.0% (±3.0%) of the protostars exhibit a mean magnetic field direction approximately perpendicular to the outflow on several 102–103 au scales. However, in the remaining sample, this relative orientation appears to be random, probably due to the complex set of morphologies observed. Furthermore, we classify the protostars into three types based on the C17O (3–2) velocity envelope’s gradient: perpendicular to outflow, non-perpendicular to outflow, and unresolved gradient (1.0 km.s.1 arcsec−1). In protostars with a velocity gradient perpendicular to outflow, the magnetic field lines are preferentially perpendicular to outflow, m.s. of them exhibit a rotated hourglass morphology, suggesting that the magnetic field has been overwhelmed by gravity and angular momentum. spiral-like magnetic fields are associated with envelopes having large velocity gradients, indicating that the rotation motions are strong enough to twist the field lines. All of the protostars with a standard-hourglass field morphology show no significant velocity gradient due to the strong magnetic braking. Copyright © 2024, The Authors. All rights reserved.

关键词： magnetic fields

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Enhanced Deuteron Coalescence Probability in Jets

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Physical Review Letters 2023年第4期131卷 042301-042301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 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 Munster 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 CNRS-IN2P3 Grenoble France Universidade de São Pa

The transverse-momentum (pT) spectra and coalescence parameters B2 of (anti)deuterons are measured in p-p collisions at s=13 TeV for the first time in and out of jets. In this measurement, the direction of the leading particle with the highest pT in the event (pTlead>5 GeV/c) is used as an approximation for the jet axis. The event is consequently divided into three azimuthal regions, and the jet signal is obtained as the difference between the toward region, that contains jet fragmentation products in addition to the underlying event (UE), and the transverse region, which is dominated by the UE. The coalescence parameter in the jet is found to be approximately a factor of 10 larger than that in the underlying event. This experimental observation is consistent with the coalescence picture and can be attributed to the smaller average phase-space distance between nucleons in the jet cone as compared with the underlying event. The results presented in this Letter are compared to predictions from a simple nucleon coalescence model, where the phase-space distributions of nucleons are generated using pythia8 with the monash 2013 tuning, and to predictions from a deuteron production model based on ordinary nuclear reactions with parametrized energy-dependent cross sections tuned on data. The latter model is implemented in pythia8.3. Both models reproduce the observed large difference between in-jet and out-of-jet coalescence parameters, although the alm.s. flat trend of the B2Jet is not reproduced by the models, which instead give a decreasing trend.

关键词： Hadron-hadron interactions

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