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Title: First Measurement of Λ c Baryon Production in Au + Au Collisions at s N N = 200 GeV

Journal Article · · Physical Review Letters
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Herein we report on the first measurement of the charmed baryon Λ c ± production at midrapidity ( |y|<1 ) in Au + Au collisions at s NN = 200 GeV collected by the STAR experiment at the Relativistic Heavy Ion Collider. The Λ c /D0 [denoting ( Λ c + + Λ c - ) / ( D 0 + D ¯ 0 ) ] yield ratio is measured to be 1.08 ± 0.16 ( stat ) ± 0.26 ( sys ) in the 0%–20% most central Au + Au collisions for the transverse momentum ( p T ) range 3 < p T < 6 GeV / c . This is significantly larger than the pythia model calculations for p+p collisions. The measured Λ c /D0 ratio, as a function of p T and collision centrality, is comparable to the baryon-to-meson ratios for light and strange hadrons in Au + Au collisions. Model calculations including coalescence hadronization for charmed baryon and meson formation reproduce the features of our measured Λ c /D0 ratio.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of Illinois, Chicago, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; FG02-94ER40865; AC02-05CH11231; SC0015636
OSTI ID:
1573479
Alternate ID(s):
OSTI ID: 1631659; OSTI ID: 1782831; OSTI ID: 1669347; OSTI ID: 1787656
Report Number(s):
BNL--212305-2019-JAAM; BNL--213777-2020-JAAM
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 124; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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