Production of Lambda Lambda and (Lambda n)over-bar in central Pb plus Pb collisions at root sNN=2.76 TeV within a covariant coalescence model

doi:10.1103/PhysRevC.94.064908

	Production of Lambda Lambda and (Lambda n)over-bar in central Pb plus Pb collisions at root sNN=2.76 TeV within a covariant coalescence model
	Sun, Kai-Jia 1,2; Chen, Lie-Wen 1,2,3
刊名	PHYSICAL REVIEW C
	2016-12-27
卷号	94 页码:6
ISSN号	2469-9985
DOI	10.1103/PhysRevC.94.064908
英文摘要	We study the production of Lambda Lambda and (Lambda n) over bar exotic states in central Pb + Pb collisions at root sNN = 2.76 TeV at the CERNLarge Hadron Collider (LHC) via both hadron and quark coalescence within a covariant coalescence model with a blast-wave-like parametrization for the phase-space configurations of constituent particles at freeze-out. In the hadron coalescence, the two states are considered as molecular states while they are considered as six-quark states in the quark coalescence. For (Lambda n) over bar, we find that the yields of both molecular and six-quark states are much larger than the experimental upper- limits. For Lambda Lambda, while the molecule-state yield is much larger than the experimental upper limits, the six-quark-state yield could be lower than the upper limits. The higher molecule-state yields are mainly due to the large contribution of short- lived strong resonance decays into (anti-) nucleons and (anti-)Lambda which can significantly enhance the molecule- state yields of Lambda Lambda and (Lambda n) over bar via hadron coalescence. Our results suggest that the current experimental measurement at the LHC cannot exclude the existence of the Lambda Lambda as an exotic six-quark state, and if Lambda Lambda is a six-quark state, it is then on the brink of being discovered.
资助项目	Major State Basic Research Development Program (973 Program) in China[2015CB856904] ; Major State Basic Research Development Program (973 Program) in China[2013CB834405] ; NSFC[11625521] ; NSFC[11275125] ; NSFC[11135011] ; Shanghai Municipal Education Commission ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Chin ; Science and Technology Commission of Shanghai Municipality[11DZ2260700] ; Shanghai Education Development Foundation
WOS关键词	HEAVY-ION COLLISIONS ; STRANGENESS
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000391015100010
资助机构	Major State Basic Research Development Program (973 Program) in China ; NSFC ; Shanghai Municipal Education Commission ; Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Chin ; Science and Technology Commission of Shanghai Municipality ; Shanghai Education Development Foundation
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/44083]
专题	中国科学院近代物理研究所
通讯作者	Chen, Lie-Wen
作者单位	1.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China 3.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Sun, Kai-Jia,Chen, Lie-Wen. Production of Lambda Lambda and (Lambda n)over-bar in central Pb plus Pb collisions at root sNN=2.76 TeV within a covariant coalescence model[J]. PHYSICAL REVIEW C,2016,94:6.
APA	Sun, Kai-Jia,&Chen, Lie-Wen.(2016).Production of Lambda Lambda and (Lambda n)over-bar in central Pb plus Pb collisions at root sNN=2.76 TeV within a covariant coalescence model.PHYSICAL REVIEW C,94,6.
MLA	Sun, Kai-Jia,et al."Production of Lambda Lambda and (Lambda n)over-bar in central Pb plus Pb collisions at root sNN=2.76 TeV within a covariant coalescence model".PHYSICAL REVIEW C 94(2016):6.