Study of asymmetry parameters of Lambda(+)(c) c decays in a tau-charm factory

Study of asymmetry parameters of Lambda(+)(c) c decays in a tau-charm factory
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tau-charm工厂中Lambda( )(c) c衰变不对称参数的研究

DOI:
10.1088/0954-3899/42/9/095002
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发表时间:
2015-07
影响因子:
3.5
通讯作者:
Li Hai-Bo
Li Hai-Bo
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Liu Jie;Ping Rong-Gang;Li Hai-Bo

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e+e− → Λc+Λ¯c− 对生产的横截面增强接近其阈值,提供了在 τ-.charm 工厂中通过 e+e− 碰撞研究粲重子 ψ Λc+ Λc− 的机会。我们估计了在衰变Λc+ →Λπ+ 和 ́ ́ Λc− →Λπ− 中寻找 CP 破坏的前景。螺旋度振幅分析表明,不对称参数 c αΛ + 和 ¯c αΛ - 可以通过查看其螺旋度系统中的角质子和反质子分布直接获得。蒙特卡罗估计表明,积分光度为 530 pb−1 的数据对于 CP.asymmetry 参数  产生约 25% 的统计精度。为了将精度提高到 0.1% 以上,需要至少 1800 fb−1 数据的积分光度。
An enhancement of cross section for e+e− → Λc+Λ¯c− pair production near their.threshold provides an opportunity to study the charm baryon ¯ Λc+ Λc− at a τ-.charm factory with e+e− collisions. We estimate the prospects of searching for.the CP violation in the decaysΛc+ →Λπ+ and¯ ¯ Λc− →Λπ−. Helicity amplitude.analysis shows that the asymmetry parameters, c αΛ + and ¯c αΛ −, can be directly.accessed by looking at the angular proton and antiproton distributions in their.helicity systems. A Monte Carlo estimation shows that data with the integrated.luminosity of 530 pb−1 yields a statistical precision of about 25% for the CP.asymmetry parameter . To improve the precision to better than 0.1%, an.integrated luminosity of at least 1800 fb−1 of data is required.
DOI: 10.1103/physrevlett.101.172001
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影响因子: 8.6
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