The prompt production of the charm baryon Λc+ and the Λc+/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at √sNN=5.02 TeV. These new measurements show a clear decrease of the Λc+/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/KS0. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e- and e-p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.

Acharya S., Adamova D., Adler A., Adolfsson J., Aglieri Rinella G., Agnello M., et al. (2021). Λc+ Production and Baryon-to-Meson Ratios in pp and p -Pb Collisions at √sNN =5.02 TeV at the LHC. PHYSICAL REVIEW LETTERS, 127(20), 1-13 [10.1103/PhysRevLett.127.202301].

Λc+ Production and Baryon-to-Meson Ratios in pp and p -Pb Collisions at √sNN =5.02 TeV at the LHC

Alici A.;Arcelli S.;Bellini F.;Carnesecchi F.;Cifarelli L.;Colocci M.;Giacalone M.;Jacazio N.;Scioli G.;
2021

Abstract

The prompt production of the charm baryon Λc+ and the Λc+/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at √sNN=5.02 TeV. These new measurements show a clear decrease of the Λc+/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<12 GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/KS0. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e- and e-p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.
2021
Acharya S., Adamova D., Adler A., Adolfsson J., Aglieri Rinella G., Agnello M., et al. (2021). Λc+ Production and Baryon-to-Meson Ratios in pp and p -Pb Collisions at √sNN =5.02 TeV at the LHC. PHYSICAL REVIEW LETTERS, 127(20), 1-13 [10.1103/PhysRevLett.127.202301].
Acharya S.; Adamova D.; Adler A.; Adolfsson J.; Aglieri Rinella G.; Agnello M.; Agrawal N.; Ahammed Z.; Ahmad S.; Ahn S.U.; Akbar Z.; Akindinov A.; Al...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/847132
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