Study of CP violation in $\Lambda_c^+$ decay

TL;DR

This paper investigates CP violation in specific $\Lambda_c^+$ decays, proposing methods to measure triple-product asymmetries, which are negligible in the Standard Model but could be significant in new physics scenarios like two Higgs doublet models.

Contribution

It introduces a comprehensive approach to analyze CP violation via triple-product asymmetries in $\Lambda_c^+$ decays, highlighting their potential to reveal new physics beyond the Standard Model.

Findings

TP asymmetries are negligible in the Standard Model.

Two Higgs doublet model can produce large TP asymmetries.

Experimental sensitivity at BES-III and Super $ au$-Charm is promising.

Abstract

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.