The first measurement at midrapidity (|y| < 0.5) of the production yield of the strange-charm baryons Ξ + c and Ξ 0 c as a function of transverse momentum (pT) in different charged-particle multiplicity classes in proton-proton collisions at √ s = 13 TeV with the ALICE experiment at the LHC is reported. The Ξ + c baryon is reconstructed via the Ξ + c → Ξ −π +π + decay channel in the range 4 < pT < 12 GeV/c, while the Ξ 0 c baryon is reconstructed via both the Ξ 0 c → Ξ −π + and Ξ 0 c → Ξ −e +νe decay channels in the range 2 < pT < 12 GeV/c. The baryon-to-meson (Ξ 0,+ c /D0 ) and the baryon-to-baryon (Ξ 0,+ c /Λ + c ) 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 BR(Ξ 0 c → Ξ −e +νe)/BR(Ξ 0 c → Ξ −π +) 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.

Null, N., Abualrob, I.J., Acharya, S., Aglieri Rinella, G., Aglietta, L., Agnello, M., et al. (2025). Multiplicity dependence of Ξ+c and Ξ0 c production in pp collisions at √s = 13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 1-31 [10.1007/jhep12(2025)038].

Multiplicity dependence of Ξ+c and Ξ0 c production in pp collisions at √s = 13 TeV

Agrawal, N.;Alici, A.;Arcelli, S.;Bellini, F.;Colocci, M.;Ercolessi, F.;Jacazio, N.;Malfattore, G.;Romanenko, G.;Rubini, N.;Sabiu, B.;Scioli, G.;Strazzi, S.;Tomassini, S.;
2025

Abstract

The first measurement at midrapidity (|y| < 0.5) of the production yield of the strange-charm baryons Ξ + c and Ξ 0 c as a function of transverse momentum (pT) in different charged-particle multiplicity classes in proton-proton collisions at √ s = 13 TeV with the ALICE experiment at the LHC is reported. The Ξ + c baryon is reconstructed via the Ξ + c → Ξ −π +π + decay channel in the range 4 < pT < 12 GeV/c, while the Ξ 0 c baryon is reconstructed via both the Ξ 0 c → Ξ −π + and Ξ 0 c → Ξ −e +νe decay channels in the range 2 < pT < 12 GeV/c. The baryon-to-meson (Ξ 0,+ c /D0 ) and the baryon-to-baryon (Ξ 0,+ c /Λ + c ) 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 BR(Ξ 0 c → Ξ −e +νe)/BR(Ξ 0 c → Ξ −π +) 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
Null, N., Abualrob, I.J., Acharya, S., Aglieri Rinella, G., Aglietta, L., Agnello, M., et al. (2025). Multiplicity dependence of Ξ+c and Ξ0 c production in pp collisions at √s = 13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2025(12), 1-31 [10.1007/jhep12(2025)038].
Null, Null; Abualrob, I. J.; Acharya, S.; Aglieri Rinella, G.; Aglietta, L.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahuja, I.; Akbar, Zul.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1048415
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