Maqola

Λ+c production in pp collisions at $$ \sqrt{s}=7 $$ TeV and in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ TeV

S. AcharyaVariable Energy Cyclotron Centre, Kolkata, IndiaFernando Torales AcostaDepartment of Physics, University of California, Berkeley, California, United StatesD. AdamováNuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech RepublicJ. AdolfssonLund University Department of Physics, Division of Particle Physics, Lund, SwedenM. M. AggarwalPhysics Department, Panjab University, Chandigarh, IndiaG. Aglieri RinellaEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandM. AgnelloDipartimento DISAT del Politecnico and Sezione INFN, Turin, ItalyN. AgrawalIndian Institute of Technology Bombay (IIT), Mumbai, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata, IndiaS. U. AhnKorea Institute of Science and Technology Information, Daejeon, Republic of KoreaS. AiolaYale University, New Haven, Connecticut, United StatesA. AkindinovInstitute for Theoretical and Experimental Physics, Moscow, RussiaM. Al-TuranyResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyS. N. AlamVariable Energy Cyclotron Centre, Kolkata, IndiaD. S. D. AlbuquerqueUniversidade Estadual de Campinas (UNICAMP), Campinas, BrazilD. AleksandrovNational Research Centre Kurchatov Institute, Moscow, RussiaB. AlessandroINFN, Sezione di Torino, Turin, ItalyR. Alfaro MolinaInstituto de Física, Universidad Nacional Autónoma de México, Mexico City, MexicoY. AliCOMSATS Institute of Information Technology (CIIT), Islamabad, PakistanA. AliciCentro Fermi - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi", Rome, ItalyA. AlkinBogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, UkraineJ. AlmeDepartment of Physics and Technology, University of Bergen, Bergen, NorwayT. AltDepartment of Physics and Technology, University of Bergen, Bergen, NorwayL. AltenkamperDepartment of Physics and Technology, University of Bergen, Bergen, NorwayI. AltsybeevC. AndreiHoria Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, RomaniaD. AndreouEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandH. A. AndrewsSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomA. AndronicResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyM. AngelettiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandV. AnguelovPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyC. AnsonCreighton University, Omaha, Nebraska, United StatesT. AntičićRudjer Bošković Institute, Zagreb, CroatiaF. AntinoriINFN, Sezione di Padova, Padova, ItalyP. AntonioliINFN, Sezione di Bologna, Bologna, ItalyN. ApadulaLawrence Berkeley National Laboratory, Berkeley, California, United StatesL. 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, ItalyO. ArnoldPhysik Department, Technische Universität München, Munich, GermanyI. C. ArseneDepartment of Physics, University of Oslo, Oslo, NorwayM. ArslandokPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyB. AudurierSUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, FranceA. AugustinusEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandR. AverbeckResearch Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, GermanyM. D. AzmiDepartment of Physics, Aligarh Muslim University, Aligarh, IndiaA. BadaláINFN, Sezione di Catania, Catania, ItalyY. W. BaekInha University, Incheon, Republic of KoreaS. BagnascoINFN, Sezione di Torino, Turin, ItalyR. BailhacheInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyR. BalaPhysics Department, University of Jammu, Jammu, IndiaA. BaldisseriUniversité Paris-SaclayM. BallHelmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, GermanyR. C. BaralInstitute of Physics, Bhubaneswar, IndiaA. M. BarbanoDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyR. BarberaDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Catania, ItalyF. BarileDipartimento Interateneo di Fisica 'M. Merlin' and Sezione INFN, Bari, ItalyL. BarioglioDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyG. G. BarnaföldiWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, HungaryL. S. BarnbyNuclear Physics Group, STFC Daresbury Laboratory, Daresbury, United KingdomV. BarretUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceP. BartaliniCentral China Normal University, Wuhan, ChinaK. BarthEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandE. BartschInstitut für Kernphysik, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, GermanyN. BastidUniversité Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceS. BasuWayne State University, Detroit, Michigan, United StatesG. BatigneSUBATECH, IMT Atlantique, Université de Nantes, CNRS-IN2P3, Nantes, FranceB. BatyunyaJoint Institute for Nuclear Research (JINR), Dubna, RussiaP. C. BatzingDepartment of Physics, University of Oslo, Oslo, NorwayJ. L. Bazo AlbaSección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú, Lima, PeruI. G. BeardenNiels Bohr Institute, University of Copenhagen, Copenhagen, DenmarkH. P. BeckPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyC. BeddaInstitute for Subatomic Physics of Utrecht University, Utrecht, NetherlandsN. K. BeheraInha University, Incheon, Republic of KoreaI. BelikovUniversité de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France, Strasbourg, FranceF. BelliniDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, ItalyH. Martı́nezBenemérita Universidad Autónoma de Puebla, Puebla, MexicoR. BellwiedUniversity of Houston, Houston, Texas, United StatesL. G. E. BeltranUniversidad Autónoma de Sinaloa, Culiacán, MexicoV. BelyaevNRNU Moscow Engineering Physics Institute, Moscow, RussiaG. BencediWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, HungaryS. 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, RussiaD. BerényiWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, HungaryR. A. BertensUniversity of Tennessee, Knoxville, Tennessee, United StatesD. BerzanoEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandL. BetevEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandP. P. BhaduriVariable Energy Cyclotron Centre, Kolkata, IndiaA. BhasinPhysics Department, University of Jammu, Jammu, IndiaI. R. BhatPhysics Department, University of Jammu, Jammu, IndiaB. BhattacharjeeGauhati University, Department of Physics, Guwahati, IndiaJ. BhomThe Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, PolandA. BianchiDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyL. BianchiUniversity of Houston, Houston, Texas, United StatesN. BianchiDipartimento di Fisica dell'Università and Sezione INFN, Turin, ItalyC. BianchinWayne State University, Detroit, Michigan, United StatesJ. BielčíkFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech RepublicJ. BielčíkováNuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech Republic

2018en

ABI

Annotatsiya

A bstract The p T -differential production cross section of prompt Λ c + charmed baryons was measured with the ALICE detector at the Large Hadron Collider (LHC) in pp collisions at $$ \sqrt{s}=7 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>7</mml:mn> </mml:math> TeV and in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <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:mn>5.02</mml:mn> </mml:math> TeV at midrapidity. The Λ c + and $$ {\overline{\varLambda}}_{\overline{\mathrm{c}}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mover> <mml:mi>Λ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:msub> </mml:math> were reconstructed in the hadronic decay modes Λ c + → pK − π + , Λ c + → pK S 0 and in the semileptonic channel Λ c + → e + ν e Λ (and charge conjugates). The measured values of the Λ c + /D 0 ratio, which is sensitive to the c-quark hadronisation mechanism, and in particular to the production of baryons, are presented and are larger than those measured previously in different colliding systems, centre-of-mass energies, rapidity and p T intervals, where the Λ c + production process may differ. The results are compared with the expectations obtained from perturbative Quantum Chromodynamics calculations and Monte Carlo event generators. Neither perturbative QCD calculations nor Monte Carlo models reproduce the data, indicating that the fragmentation of heavy-flavour baryons is not well understood. The first measurement at the LHC of the Λ c + nuclear modification factor, R pPb , is also presented. The R pPb is found to be consistent with unity and with that of D mesons within the uncertainties, and consistent with a theoretical calculation that includes cold nuclear matter effects and a calculation that includes charm quark interactions with a deconfined medium.

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DOI: 10.1007/jhep04(2018)108

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