<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math> Production and Baryon-to-Meson Ratios in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-Pb Collisions at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mi>NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>5.02</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:mrow></mml:math> at the LHC
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. AhammedHomi Bhabha National InstituteS. 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, USAI. C. 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, GermanySizar 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 Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, FranceS. 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, GermanyMihaela Gabriela BesoiuInstitute of Space Science (ISS), Bucharest, RomaniaL. BetevEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandP. P. BhaduriVariable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, IndiaA. 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 prompt production of the charm baryon ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ and the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}/{D}^{0}$ production ratios were measured at midrapidity with the ALICE detector in $pp$ and $p$-Pb collisions at $\sqrt{{s}_{\mathrm{NN}}}=5.02\text{ }\text{ }\mathrm{TeV}$. These new measurements show a clear decrease of the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}/{D}^{0}$ ratio with increasing transverse momentum (${p}_{T}$) in both collision systems in the range $2<{p}_{T}<12\text{ }\text{ }\mathrm{GeV}/c$, exhibiting similarities with the light-flavor baryon-to-meson ratios $p/\ensuremath{\pi}$ and $\mathrm{\ensuremath{\Lambda}}/{K}_{S}^{0}$. At low ${p}_{T}$, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in ${e}^{+}{e}^{\ensuremath{-}}$ and ${e}^{\ensuremath{-}}p$ collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.
Перевод пока недоступен
Идентификаторы
Цитирования и источники
Цитирований: 3Использованных источников: 0