Maqola

Measurement of the production cross section of prompt $$ {\Xi}_{\mathrm{c}}^0 $$ baryons at midrapidity in pp collisions at $$ \sqrt{s} $$ = 5.02 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 KoreaI. AhujaFaculty of Science, P.J. Šafárik University, Košice, SlovakiaZaenal 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, GermanyS. N. AlamFudan University, Shanghai, ChinaD. 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. AliAGH University of Science and Technology, Cracow, PolandY. AliCOMSATS University Islamabad, Islamabad, PakistanA. AliciDipartimento di Fisica e Astronomia del l'Università and Sezione INFN, Bologna, ItalyN. AlizadehvandchaliUniversity of Houston, Houston, Texas, United StatesA. AlkinEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandJ. 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. 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, GermanyMassimo AngelettiEuropean Organization for Nuclear Research (CERN), Geneva, SwitzerlandV. AnguelovPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyF. AntinoriINFN, Sezione di Padova, Padova, ItalyP. AntonioliINFN, Sezione di Bologna, Bologna, ItalyC. AnujDepartment of Physics, Aligarh Muslim University, Aligarh, IndiaN. 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 del l'Università and Sezione INFN, Bologna, ItalyR. ArnaldiINFN, Sezione di Torino, Turin, ItalyI. 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. BadalàINFN, 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, GermanyY. BailungIndian Institute of Technology Indore, Indore, IndiaR. 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, FranceBartosz BaliśAGH University of Science and Technology, Cracow, PolandM. 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 del l'Università and Sezione INFN, Catania, ItalyL. BarioglioDipartimento di Fisica del l'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 del l'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, United StatesI. BelikovUniversité de Strasbourg, CNRS, IPHC UMR 7178, F-67000, Strasbourg, FranceA. D. C. Bell HechavarriaWestfälische Wilhelms-Universität Münster, Institut für Kernphysik, Münster, GermanyF. BelliniDipartimento di Fisica e Astronomia del l'Università and Sezione INFN, Bologna, ItalyR. BellwiedUniversity of Houston, Houston, Texas, United StatesS. BelokurovaSt. Petersburg State University, St. Petersburg, RussiaV. M. BelyaevNRNU Moscow Engineering Physics Institute, Moscow, RussiaG. BencediInstituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Mexico City, MexicoS. BeolèDipartimento di Fisica del l'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, 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 del l'Università and Sezione INFN, Cagliari, ItalyL. BianchiDipartimento di Fisica del l'Università and Sezione INFN, Turin, ItalyN. BianchiDipartimento di Fisica del l'Università and Sezione INFN, Turin, Italy

2021en

ABI

Annotatsiya

A bstract The transverse momentum ( p T ) differential cross section of the charm-strange baryon $$ {\Xi}_{\mathrm{c}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> is measured at midrapidity (| y | < 0.5) via its semileptonic decay into e + Ξ − ν e in pp collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 5 . 02 TeV with the ALICE detector at the LHC. The ratio of the p T -differential $$ {\Xi}_{\mathrm{c}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> -baryon and D 0 -meson production cross sections is also reported. The measurements are compared with simulations with different tunes of the PYTHIA 8 event generator, with predictions from a statistical hadronisation model (SHM) with a largely augmented set of charm-baryon states beyond the current lists of the Particle Data Group, and with models including hadronisation via quark coalescence. The p T -integrated cross section of prompt $$ {\Xi}_{\mathrm{c}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> -baryon production at midrapidity is also reported, which is used to calculate the baryon-to-meson ratio $$ {\Xi}_{\mathrm{c}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> / D 0 = 0 . 20 ± 0 . 04 $$ {\left(\mathrm{stat}.\right)}_{-0.07}^{+0.08} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mfenced> <mml:mrow> <mml:mtext>stat</mml:mtext> <mml:mo>.</mml:mo> </mml:mrow> </mml:mfenced> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.07</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.08</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> (syst . ). These results provide an additional indication of a modification of the charm fragmentation from e + e − and e − p collisions to pp collisions.

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DOI: 10.1007/jhep10(2021)159

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