Study of CP violation in $\Lambda_c^+$ decay
Study of CP violation in $\Lambda_c^+$ decay
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DOI：
10.1142/s0217751x11053432
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发表时间：
2010-03
期刊：
影响因子：
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通讯作者：
X. Kang;Hai-bo Li;G. Lu;A. Datta
中科院分区：
文献类型：
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作者：
X. Kang;Hai-bo Li;G. Lu;A. Datta
在本文中，我们研究了λc^+对BP$和λc^+对BV$衰变的CP破坏，其中$B、P$和$V分别表示轻自旋-1/2重子、赝标量和矢量介子。在这些过程中，研究了违反三重积(TP)关联的$T$奇数CP。构造了由出现在角分布中的螺旋度振幅组成的真正的CP破坏可观量。在实验上，通过进行全角分析，展示了如何提取螺旋度振幅，然后获得TP不对称性。我们估计，在标准模型中，衰变过程中的TP不对称性可以忽略不计，这使得这些过程成为寻找新物理的绝佳场所。以双希格斯双重态模型为例，我们证明了在这些衰变中存在大的TP不对称性。最后，我们讨论了BES-III和Super$\tau$-Charm实验如何在$\Lambda_c^+$衰变中对这些违反CP的信号敏感。
In this paper, we study CP violation in $\Lambda_c^+\to BP$ and $\Lambda_c^+\to BV$ decays, where $B,P$ and $V$ denote a light spin-1/2 baryon, pseudoscalar and a vector meson respectively. In these processes the $T$ odd CP violating triple-product (TP) correlations are examined. The genuine CP violating observables which are composed of the helicity amplitudes occurring in the angular distribution are constructed. Experimentally, by performing a full angular analysis it is shown how one may extract the helicity amplitudes and then obtain the TP asymmetries. We estimate the TP asymmetries in $\lam$ decays to be negligible in the standard model making these processes an excellent place to look for new physics. Taking a two Higgs doublet model, as an example of new physics, we show that large TP asymmetries are possible in these decays. Finally, we discuss how BES-III and Super $\tau$-Charm experiments will be sensitive to these CP violating signals in $\Lambda_c^+$ decays.