Multiplicity dependence of and production in pp collisions at TeV

The ALICE collaboration

doi:10.1007/JHEP12(2025)038

Multiplicity dependence of and production in pp collisions at TeV

The ALICE collaboration

Sección de Física

CERN
University of Houston
National Institute for Nuclear Physics
Sezione INFN
Variable Energy Cyclotron Centre
Aligarh Muslim University
Pavol Jozef Šafárik University
National Research and Innovation Agency Republic of Indonesia
Frankfurt Institute for Advanced Studies
GSI Helmholtzzentrum für Schwerionenforschung
Central China Normal University
Universidad Nacional Autónoma de México
Sungkyunkwan University
University of Bergen
Goethe University Frankfurt
Technical University of Munich
National Institute for Physics and Nuclear Engineering
University of Derby
University of Münster
Ruprecht-Karls-Universität Heidelberg
Lawrence Berkeley National Laboratory
Universidade de São Paulo
University of Oslo
Yale University
Tokyo University
Wayne State University
Dipartimento di Fisica e Astronomia dell'Università and Sezione INFN
Gangneung-Wonju National University
University of Science and Technology of China
Indian Institute of Technology Indore
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CNRS-IN2P3
AGH University of Krakow
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Abstract

The first measurement at midrapidity (|y| < 0.5) of the production yield of the strange-charm baryons and as a function of transverse momentum (p_T) in different charged-particle multiplicity classes in proton-proton collisions at TeV with the ALICE experiment at the LHC is reported. The baryon is reconstructed via the decay channel in the range 4 < p_T< 12 GeV/c, while the baryon is reconstructed via both the and decay channels in the range 2 < p_T< 12 GeV/c. The baryon-to-meson and the baryon-to-baryon production yield ratios show no significant dependence on multiplicity. In addition, the observed yield ratios are not described by theoretical predictions that model charm-quark fragmentation based on measurements at e⁺e⁻ and e⁻p colliders, indicating differences in the charm-baryon production mechanism in pp collisions. A comparison with different event generators and tunings, including different modelling of the hadronisation process, is also discussed. Moreover, the branching-fraction ratio of is measured as 0.825 ± 0.094 (stat.) ± 0.081 (syst.). This value supersedes the previous ALICE measurement, improving the statistical precision by a factor of 1.6.

Original language	English
Article number	38
Journal	Journal of High Energy Physics
Volume	2025
Issue number	12
DOIs	https://doi.org/10.1007/JHEP12(2025)038
State	Published - Dec 2025

Keywords

Charm Physics
Hadron-Hadron Scattering
Proton-Proton Scattering

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10.1007/JHEP12(2025)038

Cite this

@article{923ade0eb78c4796a4c983a1f5163811,

title = "Multiplicity dependence of and production in pp collisions at TeV",

abstract = "The first measurement at midrapidity (|y| < 0.5) of the production yield of the strange-charm baryons and as a function of transverse momentum (pT) in different charged-particle multiplicity classes in proton-proton collisions at TeV with the ALICE experiment at the LHC is reported. The baryon is reconstructed via the decay channel in the range 4 < pT< 12 GeV/c, while the baryon is reconstructed via both the and decay channels in the range 2 < pT< 12 GeV/c. The baryon-to-meson and the baryon-to-baryon production yield ratios show no significant dependence on multiplicity. In addition, the observed yield ratios are not described by theoretical predictions that model charm-quark fragmentation based on measurements at e+e− and e−p colliders, indicating differences in the charm-baryon production mechanism in pp collisions. A comparison with different event generators and tunings, including different modelling of the hadronisation process, is also discussed. Moreover, the branching-fraction ratio of is measured as 0.825 ± 0.094 (stat.) ± 0.081 (syst.). This value supersedes the previous ALICE measurement, improving the statistical precision by a factor of 1.6.",

keywords = "Charm Physics, Hadron-Hadron Scattering, Proton-Proton Scattering",

author = "\{The ALICE collaboration\} and Abualrob, \{I. J.\} and S. Acharya and \{Aglieri Rinella\}, G. and L. Aglietta and M. Agnello and N. Agrawal and Z. Ahammed and S. Ahmad and I. Ahuja and Akbar, \{Z. U.L.\} and A. Akindinov and V. Akishina and M. Al-Turany and D. Aleksandrov and B. Alessandro and Alfanda, \{H. M.\} and \{Alfaro Molina\}, R. and B. Ali and A. Alici and A. Alkin and J. Alme and G. Alocco and T. Alt and Altamura, \{A. R.\} and I. Altsybeev and C. Andrei and N. Andreou and A. Andronic and E. Andronov and V. Anguelov and F. Antinori and P. Antonioli and N. Apadula and H. Appelsh{\"a}user and S. Arcelli and R. Arnaldi and Arneiro, \{J. G.M.C.A.\} and Arsene, \{I. C.\} and M. Arslandok and A. Augustinus and R. Averbeck and Azmi, \{M. D.\} and H. Baba and Babu, \{A. R.J.\} and A. Badal{\`a} and J. Bae and Y. Bae and Baek, \{Y. W.\} and \{Bazo Alba\}, \{J. L.\} and Gago, \{A. M.\}",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2025.",

year = "2025",

month = dec,

doi = "10.1007/JHEP12(2025)038",

language = "English",

volume = "2025",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

number = "12",

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TY - JOUR

T1 - Multiplicity dependence of and production in pp collisions at TeV

AU - The ALICE collaboration

AU - Abualrob, I. J.

AU - Acharya, S.

AU - Aglieri Rinella, G.

AU - Aglietta, L.

AU - Agnello, M.

AU - Agrawal, N.

AU - Ahammed, Z.

AU - Ahmad, S.

AU - Ahuja, I.

AU - Akbar, Z. U.L.

AU - Akindinov, A.

AU - Akishina, V.

AU - Al-Turany, M.

AU - Aleksandrov, D.

AU - Alessandro, B.

AU - Alfanda, H. M.

AU - Alfaro Molina, R.

AU - Ali, B.

AU - Alici, A.

AU - Alkin, A.

AU - Alme, J.

AU - Alocco, G.

AU - Alt, T.

AU - Altamura, A. R.

AU - Altsybeev, I.

AU - Andrei, C.

AU - Andreou, N.

AU - Andronic, A.

AU - Andronov, E.

AU - Anguelov, V.

AU - Antinori, F.

AU - Antonioli, P.

AU - Apadula, N.

AU - Appelshäuser, H.

AU - Arcelli, S.

AU - Arnaldi, R.

AU - Arneiro, J. G.M.C.A.

AU - Arsene, I. C.

AU - Arslandok, M.

AU - Augustinus, A.

AU - Averbeck, R.

AU - Azmi, M. D.

AU - Baba, H.

AU - Babu, A. R.J.

AU - Badalà, A.

AU - Bae, J.

AU - Bae, Y.

AU - Baek, Y. W.

AU - Bazo Alba, J. L.

AU - Gago, A. M.

PY - 2025/12

Y1 - 2025/12

N2 - The first measurement at midrapidity (|y| < 0.5) of the production yield of the strange-charm baryons and as a function of transverse momentum (pT) in different charged-particle multiplicity classes in proton-proton collisions at TeV with the ALICE experiment at the LHC is reported. The baryon is reconstructed via the decay channel in the range 4 < pT< 12 GeV/c, while the baryon is reconstructed via both the and decay channels in the range 2 < pT< 12 GeV/c. The baryon-to-meson and the baryon-to-baryon production yield ratios show no significant dependence on multiplicity. In addition, the observed yield ratios are not described by theoretical predictions that model charm-quark fragmentation based on measurements at e+e− and e−p colliders, indicating differences in the charm-baryon production mechanism in pp collisions. A comparison with different event generators and tunings, including different modelling of the hadronisation process, is also discussed. Moreover, the branching-fraction ratio of is measured as 0.825 ± 0.094 (stat.) ± 0.081 (syst.). This value supersedes the previous ALICE measurement, improving the statistical precision by a factor of 1.6.

AB - The first measurement at midrapidity (|y| < 0.5) of the production yield of the strange-charm baryons and as a function of transverse momentum (pT) in different charged-particle multiplicity classes in proton-proton collisions at TeV with the ALICE experiment at the LHC is reported. The baryon is reconstructed via the decay channel in the range 4 < pT< 12 GeV/c, while the baryon is reconstructed via both the and decay channels in the range 2 < pT< 12 GeV/c. The baryon-to-meson and the baryon-to-baryon production yield ratios show no significant dependence on multiplicity. In addition, the observed yield ratios are not described by theoretical predictions that model charm-quark fragmentation based on measurements at e+e− and e−p colliders, indicating differences in the charm-baryon production mechanism in pp collisions. A comparison with different event generators and tunings, including different modelling of the hadronisation process, is also discussed. Moreover, the branching-fraction ratio of is measured as 0.825 ± 0.094 (stat.) ± 0.081 (syst.). This value supersedes the previous ALICE measurement, improving the statistical precision by a factor of 1.6.

KW - Charm Physics

KW - Hadron-Hadron Scattering

KW - Proton-Proton Scattering

UR - https://www.scopus.com/pages/publications/105026572878

U2 - 10.1007/JHEP12(2025)038

DO - 10.1007/JHEP12(2025)038

M3 - Article

AN - SCOPUS:105026572878

SN - 1126-6708

VL - 2025

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 12

M1 - 38

ER -

Multiplicity dependence of and production in pp collisions at TeV

Abstract

Keywords

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