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37th International Cosmic Ray Conference, ICRC 2021

作者： Acciari, V.A. Ansoldi, s. Antonelli, L.A. Arbet Engels, 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. Heckmann, L. 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. Paneque, D. 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. Ribó, m. Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna La Laguna TenerifeE-38200 Spain Università di Udine INFN Trieste UdineI-33100 Italy RomeI-00136 Italy ETH Zürich ZürichCH-8093 Switzerland Bellaterra BarcelonaE-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 A. Alikhanyan National Science Laboratory Yerevan0036 Armenia Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy INFN Sezione di Bari Dipartimento Interateneo di Fisica Università e del Politecnico di Bari BariI-70125 Italy University of Rijeka Department of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany Finnish Centre for Astronomy with ESO University of Turku TurkuFI-20014 Finland Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan ICRANet-Armenia NAS RA Yerevan0019 Armenia Split21000 Croatia Josip Juraj Strossmayer University of Osijek Department of Physics Osijek31000 Croatia Department of Physics Kyoto University Kyoto

The origin of Galactic Cosmic rays (GCRs), whose spectrum extends to PeV energies, is one of the longest-standing problems in astroparticle physics. One of the main sources of GCRs are regarded to be supernova remnants (sNRs). While sNRs are known to accelerate protons, so far there is no evidence that sNRs can accelerate CRs to PeV energies. Providing that 10% of the parent Cosmic ray energy is converted to gamma rays, the gamma-ray spectrum extending up to 100 TeV would be a signature of a so-called Galactic PeVatron, an object responsible for the production of protons up to the knee of the Cosmic ray spectrum. The current multi-wavelength data indicate that HEss J1809-193 is one of the m.s. prom.s.ng Galactic PeVatron candidates. so far, no firm identification on the source nature has been established as there are several possible counterparts at lower energies;one of them being sNR G11.00.0. We report here the results of an observational campaign performed by the mAGIC telescopes on HEss J1809-193 since 2019 in the very-high-energy gamma-ray domain (E>100 GeV). The data were obtained with the Very Large Zenith Angle (VLZA) technique, which increased the collection area significantly to about one square kilometer. We used 60 hours of collected VLZA data to explore the spectrum and the morphology of the source at energies above several TeV. © 2022 sissa medialab srl. All rights reserved.

关键词： Cosmology

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Performance and first measurements of the mAGIC stellar Intensity Interferometer

arXiv

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arXiv 2024年

作者： Abe, s. Abhir, J. Acciari, V.A. Aguasca-Cabot, A. Agudo, I. Aniello, T. Ansoldi, s. Antonelli, L.A. Engels, A. Arbet Arcaro, C. Artero, m. Asano, K. Babić, A. Baquero, A. de Almeida, U. Barres Barrio, J.A. Batković, I. Bautista, A. Baxter, J. González, J. Becerra Bernardini, E. Bernardos, m. Bernete, J. Berti, A. Besenrieder, J. Bigongiari, C. Biland, A. Blanch, O. Bonnoli, G. Bošnjak, Ž. Burelli, I. Busetto, G. Campoy-Ordaz, A. Carosi, A. Carosi, R. Carretero-Castrillo, m. Ceribella, G. Chai, Y. Cifuentes, A. 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. de menezes, R. Del Popolo, A. Delfino, m. Delgado, J. mendez, C. Delgado Di Pierro, F. Di Venere, L. Prester, D. Dominis 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. López, R.J. García Garczarczyk, m. Gasparyan, s. Gaug, m. Paiva, J.G. Giesbrecht Giglietto, N. Giordano, F. Gliwny, P. Gradetzke, T. Grau, R. Green, D. Green, J.G. Günther, P. Hadasch, D. Hahn, A. Hassan, T. Heckmann, L. Herrera, J. Hrupec, D. Hütten, m. Imazawa, R. Ishio, K. martínez, I. Jiménez Jormanainen, J. Kayanoki, T. Kerszberg, D. Kluge, G.W. Kobayashi, Y. Kouch, P.m. Kubo, H. Kushida, J. Láinez, m. Lam.s.ra, A. 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. de Oliveira Fraga, B. machado majumdar, P. makariev, m. maneva, G. mang, N. manganaro, m. mangano, s. mannheim, K. mariotti, m. martínez, m. martínez-Chicharro, m. m.s.Aguilar, A. mazin, D. menchiari, s. mender, s. miceli, D. miener, T. miranda, J.m. mirzoyan, R. González, m. molero molina, E. mondal, H.A. moralejo, A. morcuende, D. Nakamori, T. Nanci, C. Neustroev, V. Nickel, L. Rosillo, m. Nievas Nigro, C. Nikolić, L. Nilsson, K. Nishijima, K. Ekoume, T. Njoh Noda, K. Nozaki, s. Ohtani, Y. The University of Tokyo Chiba Kashiwa277-8582 Japan ETH Zürich ZürichCH-8093 Switzerland Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna La Laguna TenerifeE-38200 Spain Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 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 GarchingD-85748 Germany Università di Padova INFN PadovaI-35131 Italy Bellaterra BarcelonaE-08193 Spain Zagreb10000 Croatia IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain URCA RJ Rio de Janeiro22290-180 Brazil Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Università di Pisa INFN Pisa PisaI-56126 Italy Department for Physics and Technology University of Bergen Norway INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy INFN MAGIC Group INFN Sezione di Catania Dipartimento di Fisica e Astronomia University of Catania CataniaI-95123 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 Technische Universität Dortmund DortmundD-44221 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 ZeuthenD-15738 Germany Armenian MAGIC Group: ICRANet-Armenia Yerevan0019 Armenia University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Cr

In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atm.s.heric Cherenkov Telescopes (IACTs). The mAGIC telescopes host the mAGIC-sII system (stellar Intensity Interferometer), implemented to investigate the feasibility and potential of this technique on IACTs. After the first successful measurements in 2019, the system was upgraded and now features a real-time, dead-time-free, 4-channel, GPU-based correlator. These hardware modifications allow seamless transitions between mAGIC’s standard very-high-energy gamma-ray observations and optical interferometry measurements within seconds. We establish the feasibility and potential of employing IACTs as competitive optical Intensity Interferometers with minimal hardware adjustments. The measurement of a total of 22 stellar diameters are reported, 9 corresponding to reference stars with previous comparable measurements, and 13 with no prior measurements. A prospective implementation involving telescopes from the forthcoming Cherenkov Telescope Array Observatory’s northern hem.s.here array, such as the first prototype of its Large-sized Telescopes, LsT-1, is technically viable. This integration would significantly enhance the sensitivity of the current system and broaden the UV-plane coverage. This advancement would enable the system to achieve competitive sensitivity with the current generation of long-baseline optical interferometers over blue wavelengths. Copyright © 2024, The Authors. All rights reserved.

关键词： Interferometers

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Observation of flow angle and flow magnitude fluctuations in Pb-Pb collisions at sNN=5.02TeV at the CERN Large Hadron Collider

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Physical Review C 2023年第5期107卷 L051901-L051901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 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 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 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 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 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 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

This Letter reports on the first measurements of transverse momentum dependent flow angle Ψn and flow magnitude vn fluctuations determined using new four-particle correlators. The measurements are performed for various centralities in Pb–Pb collisions at a center-of-m.s. energy per nucleon pair of sNN = 5.02 TeV with ALICE at the CERN Large Hadron Collider. Both flow angle and flow magnitude fluctuations are observed in the presented centrality ranges and are strongest in the m.s. central collisions and for a transverse momentum pT>2GeV/c. Comparison with theoretical models, including iEBE-VIsHNU, m.s.C, and AmPT, show that the measurements exhibit unique sensitivities to the initial state of heavy-ion collisions.

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

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Recent mAGIC results on Galactic binaries 37

Recent MAGIC results on Galactic binaries

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37th International Cosmic Ray Conference, ICRC 2021

作者： molina, E. López-Oram.s. A. Hadasch, D. Hoang, J. Acciari, V.A. Ansoldi, s. Antonelli, L.A. Arbet Engels, 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. Hahn, A. Heckmann, L. Herrera, 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. 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. 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. Paneque, D. 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. Martí i Franquès 1 Barcelona08028 Spain Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38200 Spain Università di Udine INFN Trieste UdineI-33100 Italy RomeI-00136 Italy ETH Zürich ZürichCH-8093 Switzerland Bellaterra BarcelonaE-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 Universität Würzburg WürzburgD-97074 Germany Finnish MAGIC Group Finnish Centre for Astronomy 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 NAS R

X-ray and gamma-ray binaries are systems consisting of a compact object and normally a non-degenerate companion star. m.s. of these sources have been shown to emit radiation in a broad frequency range, from radio up to X-rays and sometim.s.gamma rays. We report on recent results in very high-energy gamma rays above 100 GeV obtained by the mAGIC Collaboration for the Galactic X-ray binaries mAXI J1820+070 and 1A 0535+262, and the gamma-ray binary HEss J0632+057. multiwavelength data at lower energies are also provided for a better contextualisation of the sources. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Gamma rays

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study of flavor dependence of the baryon-to-m.s.n ratio in proton-proton collisions at s=13 TeV

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Physical Review D 2023年第11期108卷 112003-112003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 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 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 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. Cho 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 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 INFN Sezione di Bari Bari Italy Physik Department Technische Universität München Munich Germany 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 CNRS-IN2P3 Grenoble France Dipartimento di Fisica dell’Univers

The production cross sections of D0 and Λc+ hadrons originating from beauty-hadron decays (i.e., nonprompt) were measured for the first time at midrapidity (|y|<0.5) by the ALICE Collaboration in proton-proton collisions at a center-of-m.s. energy s=13 TeV. They are described within uncertainties by perturbative QCD calculations employing the fragmentation fractions of beauty quarks to baryons measured at forward rapidity by the LHCb Collaboration. The bb¯ production cross section per unit of rapidity at midrapidity, estimated from these measurements, is dσbb¯/dy||y|<0.5=83.1±3.5(stat)±5.4(syst)−3.2+12.3(extrap) μb. The baryon-to-m.s.n ratios are computed to investigate the hadronization mechanism of beauty quarks. The nonprompt Λc+/D0 production ratio has a similar trend to the one measured for the promptly produced charmed particles and to the p/π+ and Λ/Ks0 ratios, suggesting a similar baryon-formation mechanism among light, strange, charm, and beauty hadrons. The pT -integrated nonprompt Λc+/D0 ratio is found to be significantly higher than the one measured in e+e− collisions.

关键词： Hadron-hadron interactions Particle production Bottom quark

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measurement of inclusive J/ψ pair production cross section in pp collisions at s=13 TeV

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Physical Review C 2023年第4期108卷 045203-045203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 s. Aziz 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. 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 Universidade de São Paulo (USP) São Paulo

The production cross section of inclusive J/ψ pairs in pp collisions at a center-of-m.s. energy s=13 TeV is measured with ALICE. The measurement is performed for J/ψ in the rapidity interval 2.5sverse momentum pT>0. The production cross section of inclusive J/ψ pairs is reported to be 10.3±2.3(stat.)±1.3(syst.) nb in this kinematic interval. The contribution from nonprompt J/ψ (i.e., originated from beauty-hadron decays) to the inclusive sample is evaluated. The effective double-parton scattering cross section is computed, neglecting the single-parton scattering contribution.

关键词： Hadron-hadron interactions

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measurement of electrons from beauty-hadron decays in pp and Pb-Pb collisions at sNN=5.02 TeV

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Physical Review C 2023年第3期108卷 034906-034906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 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 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 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. Christianse 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

The production of electrons from beauty-hadron decays was measured at midrapidity in proton-proton (pp) and central Pb-Pb collisions at center-of-m.s. energy per nucleon-nucleon pair sNN = 5.02 TeV, using the ALICE detector at the LHC. The cross section measured in pp collisions in the transverse momentum interval 2s compared with models based on perturbative quantum chromodynamics calculations. The yield in the 10% m.s. central Pb-Pb collisions, measured in the interval 2s used to compute the nuclear modification factor RAA, extrapolating the pp reference cross section to pT larger than 8 GeV/c. The measured RAA shows significant suppression of the yield of electrons from beauty-hadron decays at high pT and does not show a significant dependence above 8GeV/c within uncertainties. The results are described by several theoretical models based on different implementations of the interaction of heavy quarks with a quark-gluon plasma, which predict a smaller energy loss for beauty quarks compared to light and charm quarks.

关键词： Jet quenching Jets & heavy flavor physics Relativistic heavy-ion collisions

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Exclusive and dissociative J/ψ photoproduction, and exclusive dimuon production, in p-Pb collisions at sNN=8.16 TeV

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Physical Review D 2023年第11期108卷 112004-112004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 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 ALICE Collaboration reports three measurements in ultraperipheral proton-lead collisions at forward rapidity. The exclusive two-photon process γγ→μ+μ− and the exclusive photoproduction of J/ψ are studied. J/ψ photoproduction with proton dissociation is measured for the first time at a hadron collider. The cross section for the two-photon process of dimuons in the invariant m.s. range from 1 to 2.5 GeV/c2 agrees with leading-order quantum electrodynamics calculations. The exclusive and dissociative cross sections for J/ψ photoproductions are measured for photon-proton center-of-m.s. energies from 27 to 57 GeV. They are in good agreement with HERA results.

关键词： Hadron-hadron interactions

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First measurement of Λc+ production down to pT=0 in pp and p-Pb collisions at sNN=5.02 TeV

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Physical Review C 2023年第6期107卷 064901-064901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 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 CNRS-IN2P3 Grenoble France Universidade de São Pa

The production of prompt Λc+ baryons has been measured at midrapidity in the transverse momentum interval 0<pT<1 GeV/c for the first time, in pp and p–Pb collisions at a center-of-m.s. energy per nucleon-nucle... 详细信息

The production of prompt Λc+ baryons has been measured at midrapidity in the transverse momentum interval 0st time, in pp and p–Pb collisions at a center-of-m.s. energy per nucleon-nucleon collision sNN=5.02TeV. The measurement was performed in the decay channel Λc+→pKs0 by applying new decay reconstruction techniques using a Kalman-Filter vertexing algorithm and adopting a machine-learning approach for the candidate selection. The pT-integrated Λc+ production cross sections in both collision systems were determined and used along with the measured yields in Pb–Pb collisions to compute the pT-integrated nuclear modification factors RpPb and RAA of Λc+ baryons, which are compared to model calculations that consider nuclear modification of the parton distribution functions. The Λc+/D0 baryon-to-m.s.n yield ratio is reported for pp and p–Pb collisions. Comparisons with models that include modified hadronization processes are presented, and the implications of the results on the understanding of charm hadronization in hadronic collisions are discussed. A significant (3.7σ) modification of the mean transverse momentum of Λc+ baryons is seen in p–Pb collisions with respect to pp collisions, while the pT-integrated Λc+/D0 yield ratio was found to be consistent between the two collision systems within the uncertainties.

关键词： Jets & heavy flavor physics Quark-gluon plasma Relativistic heavy-ion collisions

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Two-particle transverse momentum correlations in pp and p-Pb collisions at energies available at the CERN Large Hadron Collider

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Physical Review C 2023年第5期107卷 054617-054617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 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. 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 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

Two-particle transverse momentum differential correlators, recently measured in Pb-Pb collisions at energies available at the CERN Large Hadron Collider (LHC), provide an additional tool to gain insights into particle production mechanisms and infer transport properties, such as the ratio of shear viscosity to entropy density, of the medium created in Pb-Pb collisions. The longitudinal long-range correlations and the large azimuthal anisotropy measured at low transverse momenta in small collision systems, namely pp and p-Pb, at LHC energies resemble manifestations of collective behavior. This suggests that locally equilibrated matter may be produced in these small collision systems, similar to what is observed in Pb-Pb collisions. In this work, the same two-particle transverse momentum differential correlators are exploited in pp and p-Pb collisions at s=7TeV and sNN=5.02TeV, respectively, to seek evidence for viscous effects. specifically, the strength and shape of the correlators are studied as a function of the produced particle multiplicity to identify evidence for longitudinal broadening that might reveal the presence of viscous effects in these smaller systems. The measured correlators and their evolution from pp and p-Pb to Pb-Pb collisions are additionally compared to predictions from monte Carlo event generators, and the potential presence of viscous effects is discussed.

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

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