Lambda(+)(C) production in pb-pb collisions at root S-NN=5.02 TeV

doi:10.1016/j.physletb.2019.04.046

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	Lambda(+)(C) production in pb-pb collisions at root S-NN=5.02 TeV
	Acharya, S ; Acosta, FT ; Adamova, D ; Adhya, SP ; Adler, A ; Adolfsson, J ; Aggarwal, MM ; Rinella, GA ; Agnello, M ; Agrawal, N
刊名	PHYSICS LETTERS B
	2019
卷号	793 期号:-页码:212—223
ISSN号	0370-2693
DOI	10.1016/j.physletb.2019.04.046
文献子类	期刊论文
英文摘要	A measurement of the production of prompt Lambda(+)(C) baryons in Pb-Pb collisions at root S-NN = 5.02 TeV with the ALICE detector at the LHC is reported. The Lambda(+)(C) and (Lambda) over bar (-)(C) were reconstructed at midrapidity (vertical bar y vertical bar < 0.5) via the hadronic decay channel Lambda(+)(C) -> pK(S)(0) (and charge conjugate) in the transverse momentum and centrality intervals 6 < p(T) < 12 GeV/c and 0-80%. The Lambda(+)(C)/D-0 ratio, which is sensitive to the charm quark hadronisation mechanisms in the medium, is measured and found to be larger than the ratio measured in minimum-bias pp collisions at root s = 7 TeV and in p-Pb collisions at root S-NN = 5.02 TeV. In particular, the values in p-Pb and Pb-Pb collisions differ by about two standard deviations of the combined statistical and systematic uncertainties in the common P-T interval covered by the measurements in the two collision systems. The Lambda(+)(C)/D-0 ratio is also compared with model calculations including different implementations of charm quark hadronisation. The measured ratio is reproduced by models implementing a pure coalescence scenario, while adding a fragmentation contribution leads to an underestimation. The Lambda(+)(C) nuclear modification factor, R-AA, is also presented. The measured values of the R-AA of Lambda(+)(C), D-S(+) and non-strange D mesons are compatible within the combined statistical and systematic uncertainties. They show, however, a hint of a hierarchy (R-AA(D0) < R-AA(DS+) < R-AA(Lambda C+)), conceivable with a contribution from coalescence mechanisms to charm hadron formation in the medium. (C) 2019 European Organization for Nuclear Research. Published by Elsevier B.V.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31688]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Yerevan Phys Inst Fdn, Al Alikhanyan Natl Sci Lab, Yerevan, Armenia; 2.Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine; 3.Bose Inst, Dept Phys, Kolkata, India; 4.Bose Inst, Ctr Astroparticle Phys & Space Sci, Kolkata, India; 5.Budker Inst Nucl Phys, Novosibirsk, Russia; 6.Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA USA; 7.Cent China Normal Univ, Wuhan, Hubei, Peoples R China; 8.IN2P3, Ctr Calcul, Lyon, France; 9.Ctr Aplicac Tecnol & Desarrollo Nucl CEADEN, Havana, Cuba; 10.Ctr Invest & Estudios Avanzados CINVESTAV, Mexico City, DF, Mexico;
推荐引用方式 GB/T 7714	Acharya, S,Acosta, FT,Adamova, D,et al. Lambda(+)(C) production in pb-pb collisions at root S-NN=5.02 TeV[J]. PHYSICS LETTERS B,2019,793(-):212—223.
APA	Acharya, S.,Acosta, FT.,Adamova, D.,Adhya, SP.,Adler, A.,...&Zurlo, N.(2019).Lambda(+)(C) production in pb-pb collisions at root S-NN=5.02 TeV.PHYSICS LETTERS B,793(-),212—223.
MLA	Acharya, S,et al."Lambda(+)(C) production in pb-pb collisions at root S-NN=5.02 TeV".PHYSICS LETTERS B 793.-(2019):212—223.