<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msubsup></mml:math> production in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math> and in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>-Pb collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mrow><mml:mn>5.02</mml:mn></mml:mrow></mml:mrow></mml:math> TeV
S. AcharyaVariable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, IndiaD. AdamováNuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech RepublicA. AdlerJohann-Wolfgang-Goethe Universität Frankfurt Institut für Informatik, Fachbereich Informatik und Mathematik, Frankfurt, GermanyJ. AdolfssonLund University Department of Physics, Division of Particle Physics, Lund, SwedenG. Aglieri RinellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. AgnelloDipartimento DISAT del Politecnico and Sezione INFN, Turin, ItalyN. AgrawalINFN, Sezione di Bologna, Bologna, ItalyZ. AhammedVariable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, IndiaS. AhmadDepartment of Physics, Aligarh Muslim University, Aligarh, IndiaS. U. AhnKorea Institute of Science and Technology Information, Daejeon, Republic of KoreaZaenal AkbarIndonesian Institute of Sciences, Jakarta, IndonesiaA. AkindinovNRC «Kurchatov»Institute - ITEP, Moscow, RussiaM. Al-TuranyResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyD. S. D. AlbuquerqueUniversidade Estadual de Campinas (UNICAMP), Campinas, BrazilD. AleksandrovNational Research Centre Kurchatov Institute, Moscow, RussiaB. AlessandroINFN, Sezione di Torino, Turin, ItalyH. M. AlfandaCentral China Normal University, Wuhan, ChinaR. Alfaro MolinaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoB. AliDepartment of Physics, Aligarh Muslim University, Aligarh, IndiaY. AliCOMSATS University Islamabad, Islamabad, PakistanA. AliciDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, ItalyN. AlizadehvandchaliUniversity of Houston, Houston, Texas, USAA. AlkinEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandJ. AlmeDepartment of Physics and Technology, University of Bergen, Bergen, NorwayT. AltInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyL. AltenkamperDepartment of Physics and Technology, University of Bergen, Bergen, NorwayI. AltsybeevSt. Petersburg State University, St. Petersburg, RussiaM. N. AnaamCentral China Normal University, Wuhan, ChinaC. AndreiHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, RomaniaD. AndreouNikhef, National institute for subatomic physics, Amsterdam, NetherlandsA. AndronicWestfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, GermanyM. AngelettiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandV. AnguelovPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyT. AntičićRudjer Bošković Institute, Zagreb, CroatiaF. AntinoriINFN, Sezione di Padova, Padova, ItalyP. AntonioliINFN, Sezione di Bologna, Bologna, ItalyN. ApadulaLawrence Berkeley National Laboratory, Berkeley, California, USAL. AphecetcheSUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, FranceH. AppelshäuserInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyS. ArcelliDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, ItalyR. ArnaldiINFN, Sezione di Torino, Turin, ItalyM. ArratiaLawrence Berkeley National Laboratory, Berkeley, California, USAIonut Cristian ArseneDepartment of Physics, University of Oslo, Oslo, NorwayM. ArslandokPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyA. AugustinusEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandR. AverbeckResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyS. AzizLaboratoire de Physique des 2 Infinis, Irène Joliot-Curie, Orsay, FranceM. D. AzmiDepartment of Physics, Aligarh Muslim University, Aligarh, IndiaA. BadaláINFN, Sezione di Catania, Catania, ItalyY. W. BaekGangneung-Wonju National University, Gangneung, Republic of KoreaX. BaiResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyR. BailhacheInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyR. BalaPhysics Department, University of Jammu, Jammu, IndiaA. BalbinoDipartimento DISAT del Politecnico and Sezione INFN, Turin, ItalyA. BaldisseriUniversité Paris-Saclay Centre d'Etudes de Saclay (CEA), IRFU, Départment de Physique Nucléaire (DPhN), Saclay, FranceM. BallHelmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, GermanyD. BanerjeeBose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, IndiaR. BarberaDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, ItalyL. BarioglioDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyM. BarlouNational and Kapodistrian University of Athens, School of Science, Department of Physics, Athens, GreeceG. G. BarnaföldiWigner Research Centre for Physics, Budapest, HungaryL. S. BarnbyNuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United KingdomV. BarretUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceC. BartelsUniversity of Liverpool, Liverpool, United KingdomK. BarthEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandE. BartschInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyF. BaruffaldiDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Padova, ItalyN. BastidUniversité Clermont AuvergneS. BasuLund University Department of Physics, Division of Particle Physics, Lund, SwedenG. BatigneSUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, FranceB. BatyunyaJoint Institute for Nuclear Research (JINR), Dubna, RussiaD. BauriIndian Institute of Technology Bombay (IIT), Mumbai, IndiaJ. L. Bazo AlbaSección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, PeruI. G. BeardenNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkC. BeattieYale University, New Haven, Connecticut, USAI. BelikovUniversité de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France, Strasbourg, FranceA. D. C. Bell HechavarriaWestfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, GermanyF. BelliniEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandR. BellwiedUniversity of Houston, Houston, Texas, USAS. BelokurovaSt. Petersburg State University, St. Petersburg, RussiaV. BelyaevNRNU Moscow Engineering Physics Institute, Moscow, RussiaG. BencediInstituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, MexicoS. BeolèDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyA. BercuciHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, RomaniaY. BerdnikovPetersburg Nuclear Physics Institute, Gatchina, RussiaA. BerdnikovaPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyD. BerényiWigner Research Centre for Physics, Budapest, HungaryL. BergmannPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyM. G. BesoiuInstitute of Space Science (ISS), Bucharest, RomaniaL. BetevEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandPartha Pratim BhaduriHomi Bhabha National InstituteA. BhasinPhysics Department, University of Jammu, Jammu, IndiaI. R. BhatPhysics Department, University of Jammu, Jammu, IndiaM. A. BhatBose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, IndiaB. BhattacharjeeGauhati University, Department of Physics, Guwahati, IndiaP. BhattacharyaDipartimento di Fisica dell'Università and Sezione INFN, Cagliari, ItalyA. BianchiDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyL. BianchiDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyN. BianchiINFN, Laboratori Nazionali di Frascati, Frascati, ItalyJ. BielčíkFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
2021lv
ABI
Аннотация
The production cross section of prompt ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ charm baryons was measured with the ALICE detector at the LHC at midrapidity in proton-proton ($pp$) and proton-lead ($p\text{--Pb}$) collisions at a center-of-mass energy per nucleon pair of $\sqrt{{s}_{\mathrm{NN}}}=5.02\phantom{\rule{0.16em}{0ex}}\mathrm{TeV}$. The ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ and $\overline{\mathrm{\ensuremath{\Lambda}}}{}_{c}^{\ensuremath{-}}$ baryons were reconstructed in the hadronic decay channels ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ and ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}_{S}^{0}$ and respective charge conjugates. The measured differential cross sections as a function of transverse momentum (${p}_{T}$) and the ${p}_{T}$-integrated ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ production cross section in $pp$ and in $p\text{--Pb}$ collisions are presented. The ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ nuclear modification factor (${R}_{p\mathrm{Pb}}$), calculated from the cross sections in $pp$ and in $p\text{--Pb}$ collisions, is presented and compared with the ${R}_{p\mathrm{Pb}}$ of $D$ mesons. The ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}/{D}^{0}$ ratio is also presented and compared with the light-flavor baryon-to-meson ratios $p/\ensuremath{\pi}$ and $\mathrm{\ensuremath{\Lambda}}/{K}_{S}^{0}$, and measurements from other LHC experiments. The results are compared to predictions from model calculations and Monte Carlo event generators.
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