Study of Lambda_c spin at a tau-charm factory
Study of Lambda_c spin at a tau-charm factory
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tau-charm 工厂的 Lambda_c 自旋研究
DOI：
10.1103/physrevd.91.014003
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
平荣刚
中科院分区：
文献类型：
--
作者：
陈洪;平荣刚
在阈值附近，\(e^{+}e^{-}\to\Lambda_{c}^{+}\Lambda_{c}^{-}\)对产生的大截面为在具有\(e^{+}e^{-}\)碰撞的\(\tau\)-粲工厂研究粲重子\(\Lambda_{c}^{+}/\Lambda_{c}^{-}\)提供了机会。我们呼吁利用过程\(e^{+}e^{-}\to\Lambda_{c}^{+}\Lambda_{c}^{-}\)，\(\Lambda_{c}^{+}\to pK_{S}\)来确定\(\Lambda_{c}^{+}/\Lambda_{c}^{-}\)的自旋，并且我们给出了一个公式和一种方法来估计自旋赋值\(J = 1/2\)和\(J = 3/2\)时的统计显著性。一项蒙特卡罗研究表明，该显著性对观测到的事件数量敏感。几百个观测到的信号事件将产生大于五个标准差的统计显著性。
A large cross section for e+e− → Λc+Λc- pair production near its +reshold provides an opportunity to.study charm baryon Λc+/Λc- at a τ-charm factory wi+ e+e− collisions. We call for the determination of.the Λc+/Λc- spin using the process e+e− → Λc+Λc-, Λc+→ pK_S, and we present a formula and a me+od to.estimate +e statistical significance for spin assignment J = 1/2 and J = 3/2. A Monte Carlo study shows +at.+e significance is sensitive to +e number of observed events. A few hundred observed signal events will.yield +e statistical significance larger +an five standard deviations.