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.

Multiplicity dependence of and production in pp collisions at TeV

Bonomi G.
Membro del Collaboration Group
;
Lea R.
Membro del Collaboration Group
;
Pagano D.
Membro del Collaboration Group
;
Zurlo N.
Membro del Collaboration Group
2025-01-01

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.
2025
Inglese
2025
12
Charm Physics; Hadron-Hadron Scattering; Proton-Proton Scattering
Not applicable
1043
info:eu-repo/semantics/article
262
Abualrob, I. J.; Acharya, S.; Aglieri Rinella, G.; Aglietta, L.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahuja, I.; Akbar, Z. U. L.; Akindin...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/639325
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