Determination of the Λ+ c spin via the reaction e + e − → Λc Λ¯ c
Determination of the Λ+ c spin via the reaction e + e − → Λc Λ¯ c
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通过反应 e e Ø Ø c 测定 Îc 自旋
DOI：
10.1103/physrevd.103.l091101
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发表时间：
2021
影响因子：
5
通讯作者：
BESIII Collaboration
中科院分区：
文献类型：
--
作者：
M. Ablikim;M. N. Achosov et.al;BESIII Collaboration
我们报告了两种可能的Λ ψ c自旋假设，J <$1.2和3.2，通过过程. ε ε − → Λ ψ c.<$Λ−c，使用Λ ψ c.衰变为pK 0.S，Λπ ε，Λ 0π ε和Λ π π0的角分布进行比较。这些数据是用BESIII探测器在pffiffi <$4.6 GeV下记录的，对应的积分光度为0.587 pb−1。确定Λ π c.自旋为1/4 1.2，该值优于3.2假设，显著性对应于大于6个高斯标准差。
We report on a comparison of two possible Λþc.spin hypotheses, J ¼ 1.2 and 3.2, via the process.eþe− → Λþc.¯ Λ−c , using the angular distributions of Λþc.decays into pK0.S, Λπþ, Σ0πþ, and Σþπ0. The data were recorded at pffisffiffi ¼ 4.6 GeV with the BESIII detector and correspond to an integrated luminosity of.587 pb−1. The Λþc.spin is determined to be J ¼ 1.2, with this value favored over the 3.2 hypothesis with a.significance corresponding to more than 6 Gaussian standard deviations.