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 Ξ+c and Ξ0 c production in pp collisions at √s = 13 TeV / Null, N., Abualrob, I.J., Acharya, S., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahuja, I., Akbar, Zul., Akindinov, A., Akishina, V., Al-Turany, M., Aleksandrov, D., Alessandro, B., Alfanda, H.M., Alfaro Molina, R., Ali, B., Alici, A., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - ELETTRONICO. - 2025:12(2025), pp. 38.--38.-. [10.1007/jhep12(2025)038]

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

Camerini, P.;Cannito, S.;Cattaruzzi, S.;Contin, G.;De Martin, C.;Fragiacomo, E.;Luparello, G.;Margagliotti, G. V.;Piano, S.;Rui, R.;Urioni, M.;Villani, A.;Zaccolo, V.;
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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3131898
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