The prompt production of the charm baryon Λþ c and the Λþ c =D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at ffiffiffiffiffiffiffiffi sNN p ¼ 5.02 TeV. These new measurements show a clear decrease of the Λþ c =D0 ratio with increasing transverse momentum (p T ) in both collision systems in the range 2 < p T < 12 GeV=c, exhibiting similarities with the light-flavor baryon-to- meson ratios p=π and Λ=K0 S. At low p T, 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 eþe− 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.
{$\Lambda^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt {s_{NN}}$=5.02\,\,TeV at the LHC} / Acharya, S., Adamová, D., Adler, A., Adolfsson, J., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S.U., Ahuja, I., Akbar, Z., Akindinov, A., Al-Turany, M., Alam, S.N., Aleksandrov, D., Alessandro, B., Alfanda, H.M., Alfaro Molina, R., Ali, B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 127:20(2021). [10.1103/PhysRevLett.127.202301]
{$\Lambda^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt {s_{NN}}$=5.02\,\,TeV at the LHC}
L. CunqueiroMembro del Collaboration Group
;
2021
Abstract
The prompt production of the charm baryon Λþ c and the Λþ c =D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at ffiffiffiffiffiffiffiffi sNN p ¼ 5.02 TeV. These new measurements show a clear decrease of the Λþ c =D0 ratio with increasing transverse momentum (p T ) in both collision systems in the range 2 < p T < 12 GeV=c, exhibiting similarities with the light-flavor baryon-to- meson ratios p=π and Λ=K0 S. At low p T, 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 eþe− 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.| File | Dimensione | Formato | |
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