Study of CP violation in ${\Lambda }_c^{+}$ decay

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.

7 pages, 2 tables. Journal reference is added

References in corpus (2)

• Observation of a near-threshold enhancement in the e+e- -->Lambda_c+Lambda_c- cross section using initial-state radiation
• Strong Phase and $D^0-D^{0}bar$ mixing at BES-III