Measurement of the production cross section of prompt $$\Xi ^0_{\textrm{c}}$$ baryons in p–Pb collisions at $$\sqrt{s_{{\textrm{NN}}}}=5.02$$ TeV

Abstract The transverse momentum ( $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> ) differential production cross section of the promptly produced charm-strange baryon $$\mathrm {\Xi _{c}^{0}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> (and its charge conjugate $$\overline{\mathrm {\Xi _{c}^{0}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) is measured at midrapidity via its hadronic decay into $$\mathrm{\pi ^{+}}\Xi ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>Ξ</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> in p–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mspace/> <mml:mo>=</mml:mo> <mml:mspace/> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV with the ALICE detector at the LHC. The $$\mathrm {\Xi _{c}^{0}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> nuclear modification factor ( $$R_{\textrm{pPb}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>pPb</mml:mtext> </mml:msub> </mml:math> ), calculated from the cross sections in pp and p–Pb collisions, is presented and compared with the $$R_{\textrm{pPb}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>pPb</mml:mtext> </mml:msub> </mml:math> of $$\mathrm {\Lambda _{c}^{+}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> baryons. The ratios between the $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> -differential production cross section of $$\mathrm {\Xi _{c}^{0}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> baryons and those of $$\mathrm {D^0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> mesons and $$\mathrm {\Lambda _{c}^{+}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> baryons are also reported and compared with results at forward and backward rapidity from the LHCb Collaboration. The measurements of the production cross section of prompt $$\Xi ^0_\textrm{c}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mtext>c</mml:mtext> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> baryons are compared with a model based on perturbative QCD calculations of charm-quark production cross sections, which includes only cold nuclear matter effects in p–Pb collisions, and underestimates the measurement by a factor of about 50. This discrepancy is reduced when the data is compared with a model that includes string formation beyond leading-colour approximation or in which hadronisation is implemented via quark coalescence. The $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> -integrated cross section of prompt $$\Xi ^0_\textrm{c}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mtext>c</mml:mtext> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> -baryon production at midrapidity extrapolated down to $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi>

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The European Physical Journal C
Published
2025-01-27
DOI
https://doi.org/10.1140/epjc/s10052-024-13531-w
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High-Energy Particle Collisions Research
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article
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article

Measurement of the production cross section of prompt $$\Xi ^0_{\textrm{c}}$$ baryons in p–Pb collisions at $$\sqrt{s_{{\textrm{NN}}}}=5.02$$ TeV

F. Ronchetti, L. Lautner, I. Chakaberia, K. Barth et al.
The European Physical Journal C
High-Energy Particle Collisions Research
article

Measurement of the production cross section of prompt $$\Xi ^0_{\textrm{c}}$$ baryons in p–Pb collisions at $$\sqrt{s_{{\textrm{NN}}}}=5.02$$ TeV

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Janson, B. Polichtchouk, R. Lea, Valerio Sarritzu, H. Caines, C. Mordasini, Tomasz Marcin Lelek, Z. Rescakova, Austin Robert Schmier, A. Mastroserio, Qiye Shou, Ingrid Mckibben Lofnes, G. Neskovic, S. F. Stiefelmaier, M. Ivanov, Peter Martin Jacobs, A. Tumkin, N. Poljak, M. Barlou, R. Ricci, N. Zaviyalov, L. Serkin, P. Giubellino, S. Sadovsky, L. Pinsky, A. Kurepin, R. Guernane, Y. Miake, Y. Sibiriak, Y. Wang, N. Smirnov, S. Gotovac, Y. Pestov, P. Dupieux, C. Jahnke, L. Musa, V. Pozdniakov, K. Reygers, B. Batyunya, V. Anguelov, C. Furget, D. A. Moreira De Godoy, A. Shabetai, Z. Vilakazi, P. Dhankher, D. Röhrich, G. Eulisse, S. Vergara Limón, D. J. Q. Goh, T. B. Saramela, M. Oya, J. M. Sonneveld, A. L. Mazuecos, A. D. C. Bell Hechavarria, S. A. Konigstorfer, H. D. Regules-Medel, A. Schmah, A. P. Bigot, I. Belikov, P. Buehler, А. Виноградов, P. Larionov, J. Otwinowski, H. Yu, R. Grosso, C. Grigoras, F. Rami, M. Vasileiou, S. Chattopadhyay, M. A. Janik, K. Oyama, W. 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Peitzmann, Mingyang Li, Sadhana Dash, L. Zhang
article en

Abstract

Abstract The transverse momentum ( $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> ) differential production cross section of the promptly produced charm-strange baryon $$\mathrm {\Xi _{c}^{0}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> (and its charge conjugate $$\overline{\mathrm {\Xi _{c}^{0}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> ) is measured at midrapidity via its hadronic decay into $$\mathrm{\pi ^{+}}\Xi ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>Ξ</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:math> in p–Pb collisions at a centre-of-mass energy per nucleon–nucleon collision $$\sqrt{s_{\textrm{NN}}}~=~5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mspace/> <mml:mo>=</mml:mo> <mml:mspace/> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV with the ALICE detector at the LHC. The $$\mathrm {\Xi _{c}^{0}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> nuclear modification factor ( $$R_{\textrm{pPb}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>pPb</mml:mtext> </mml:msub> </mml:math> ), calculated from the cross sections in pp and p–Pb collisions, is presented and compared with the $$R_{\textrm{pPb}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>R</mml:mi> <mml:mtext>pPb</mml:mtext> </mml:msub> </mml:math> of $$\mathrm {\Lambda _{c}^{+}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> baryons. The ratios between the $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> -differential production cross section of $$\mathrm {\Xi _{c}^{0}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> baryons and those of $$\mathrm {D^0}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>D</mml:mi> <mml:mn>0</mml:mn> </mml:msup> </mml:math> mesons and $$\mathrm {\Lambda _{c}^{+}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> </mml:mrow> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> baryons are also reported and compared with results at forward and backward rapidity from the LHCb Collaboration. The measurements of the production cross section of prompt $$\Xi ^0_\textrm{c}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mtext>c</mml:mtext> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> baryons are compared with a model based on perturbative QCD calculations of charm-quark production cross sections, which includes only cold nuclear matter effects in p–Pb collisions, and underestimates the measurement by a factor of about 50. This discrepancy is reduced when the data is compared with a model that includes string formation beyond leading-colour approximation or in which hadronisation is implemented via quark coalescence. The $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> -integrated cross section of prompt $$\Xi ^0_\textrm{c}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mtext>c</mml:mtext> <mml:mn>0</mml:mn> </mml:msubsup> </mml:math> -baryon production at midrapidity extrapolated down to $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi>

The European Physical Journal CVol. 85(1)
Université Claude Bernard Lyon 1 (FR), University of Foggia (IT), Warsaw University of Technology (PL), National Agency for New Technologies, Energy and Sustainable Economic Development (IT), University of Messina (IT), Hiroshima University (JP), Goethe University Frankfurt (DE), Creighton University (US), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), University of Copenhagen (DK), University of Science and Technology of China (CN), Jagiellonian University (PL), Variable Energy Cyclotron Centre (IN), Oak Ridge National Laboratory (US), Centre National de la Recherche Scientifique (FR), Universidade Federal do Rio Grande do Sul (BR), University of Salerno (IT), A. Alikhanyan National Laboratory (AM), Gangneung–Wonju National University (KR), University of Bonn (DE), Gauhati University (IN), University of Trieste (IT), University of Jammu (IN), University of Tsukuba (JP), University of Kansas (US), University of Liverpool (GB), Lawrence Berkeley National Laboratory (US), National Academy of Sciences of Ukraine (UA), California Polytechnic State University (US), Bose Institute (IN), University of Cape Town (ZA), Saha Institute of Nuclear Physics (IN), Indian Institute of Technology Bombay (IN), National Institute of Science Education and Research (IN), Chungbuk National University (KR), GSI Helmholtz Centre for Heavy Ion Research (DE), Aligarh Muslim University (IN), Saga University (JP), Politecnico di Torino (IT), Western Norway University of Applied Sciences (NO), University of Zagreb (HR), Universidade Estadual de Campinas (UNICAMP) (BR), Technical University of Košice (SK), University of Oslo (NO), Wayne State University (US), Lund University (SE), Nagasaki Institute of Applied Science (JP), Inha University (KR), University of the Witwatersrand (ZA), Utrecht University (NL), Yonsei University (KR), Universidad Autónoma de Sinaloa (MX), Université Clermont Auvergne (FR), Homi Bhabha National Institute (IN), National and Kapodistrian University of Athens (GR), Université de Lyon (FR), University of Pavol Jozef Šafárik (SK), Slovak Academy of Sciences (SK), University of Wrocław (PL), University of Derby (GB), Heidelberg University (DE), University of Münster (DE), Fudan University (CN), University of Pavia (IT), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Helsinki Institute of Physics (FI), University of South-Eastern Norway (NO), Frankfurt Institute for Advanced Studies (DE), Daresbury Laboratory (GB), University of California System (US), Sejong University (KR), United Nations University Institute for Sustainability and Peace (JP), China University of Geosciences (CN), Yale University (US), Institute of Physics, Bhubaneshwar (IN), Central China Normal University (CN), Yıldız Technical University (TR), Max Planck Institute for Physics (DE), Institute of Experimental Physics of the Slovak Academy of Sciences (SK), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), National Institute for Subatomic Physics (NL), AGRIDEA (CH), China Institute of Atomic Energy (CN), Technologie- und Förderzentrum im Kompetenzzentrum für Nachwachsende Rohstoffe (DE), National Centre for Nuclear Research (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Torino (IT), Laboratoire de Physique de Clermont Auvergne (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Laboratoire de Physique Subatomique et des Technologies Associées (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Pavia (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT), Environnement, ville, société (FR), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), HUN-REN Wigner Research Centre for Physics (HU), IMT Atlantique (FR), CEA Paris-Saclay (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (IT), National Nuclear Research Center (AZ), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), South Great Plain Regional Innovation Agency (HU), Laboratoire de Physique Subatomique et de Cosmologie (FR), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Hospital Universitário da Universidade de São Paulo (BR), Institute of Space Science - INFLPR Subsidiary (RO), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Czech Academy of Sciences, Nuclear Physics Institute (CZ), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Stefan Meyer Institute for Subatomic Physics (AT), KTO Karatay University (TR), Bogolyubov Institute for Theoretical Physics (UA), Max Planck Institute for Nuclear Physics (DE), National Nuclear Energy Agency of Indonesia (ID), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CU), Gesellschaft Fur Mathematik Und Datenverarbeitung (DE), National Research and Innovation Agency (ID), University of Bergen (NO), University of Houston (US), Czech Technical University in Prague (CZ), Pusan National University (KR), Panjab University (IN), The Ohio State University (US), Sofia University "St. Kliment Ohridski" (BG), Universitatea Națională de Știință și Tehnologie Politehnica București (RO), Technical University of Munich (DE), Indian Institute of Technology Indore (IN), Pontificia Universidad Católica del Perú (PE), European Organization for Nuclear Research (CH), Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (MX), AGH University of Krakow (PL), Polytechnic University of Bari (IT), Université de Strasbourg (FR), Universidade Federal do ABC (BR), Benemérita Universidad Autónoma de Puebla (MX), Chicago State University (US), Comenius University Bratislava (SK), The University of Tokyo (JP), University of Tennessee at Knoxville (US), University of Birmingham (GB), University of Brescia (IT), Jeonbuk National University (KR), University of Tübingen (DE), Suranaree University of Technology (TH), Sungkyunkwan University (KR), The University of Texas at Austin (US), National Research Foundation (ZA), Korea Institute of Science & Technology Information (KR), Universidad Nacional Autónoma de México (MX), Université Grenoble Alpes (FR), University of Split (HR), University of Jyväskylä (FI), University of California, Berkeley (US), Nantes Université (FR), Nara Women's University (JP), Polish Academy of Sciences (PL)
National Science Foundation, U.S. Department of Energy, European Commission, Grantová Agentura České Republiky, Science and Technology Facilities Council, Nuclear Physics
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High-Energy Particle Collisions Research
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