Abstract
The transverse momentum (pT) spectra of inclusively produced Λc+ baryons are measured via the exclusive decay channel Λc+→pK−π+ using the CMS detector at the LHC. Spectra are measured as a function of transverse momentum in proton-proton (pp) and lead-lead (PbPb) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measurement is performed within the Λc+ rapidity interval |y|<1 in the pT range of 5–20GeV/c in pp and 10–20GeV/c in PbPb collisions. The observed yields of Λc+ for pT of 10–20GeV/c suggest a suppression in central PbPb collisions compared to pp collisions scaled by the number of nucleon-nucleon (NN) interactions. The Λc+/D0 production ratio in pp collisions is compared to theoretical models. In PbPb collisions, this ratio is consistent with the result from pp collisions in their common pT range.
Highlights
Measurements of heavy-quark production provide unique inputs in understanding the parton energy loss and the degree of thermalization in the quark-gluon plasma (QGP) [1] formed in high energy heavy ion collisions
One such observable is the nuclear modification factor, RAA, which is the ratio of the yield in heavy ion collisions to that in pp collisions scaled by the number of nucleonnucleon (NN) interactions
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Summary
Measurements of heavy-quark production provide unique inputs in understanding the parton energy loss and the degree of thermalization in the quark-gluon plasma (QGP) [1] formed in high energy heavy ion collisions. In the intermediate pT region (2 pT 6 GeV/c), a significant enhancement of the baryon-to-meson ratio is observed in heavy ion collisions for hadrons with up, down, or strange quarks [5,6] This enhancement, and its dependence on centrality (i.e., the degree of overlap of the two colliding nuclei) can be explained in a scenario with hadronization via coalescence. A significant contribution of coalescence to the hadronization of charm quarks from the QGP medium is supported by various measurements of charmonium and open charm production at RHIC and LHC energies [8,9,10,11,12,13,14,15,16] One such observable is the nuclear modification factor, RAA, which is the ratio of the yield in heavy ion collisions to that in pp collisions scaled by the number of nucleonnucleon (NN) interactions. The values of RAA are obtained for three centrality intervals: 0–100%, 0–30%, and 30–100%
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