Imprints of CP violation asymmetries in rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in family non-universal $Z^{\prime }$ model

Abstract

We investigate the exclusive rare baryonic ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ in a family non-universal $Z^{\prime }$ model, which is one of the natural extension of standard model. Using transition form factors, calculated in the framework of light cone QCD sum rules, we analyze the effects of polarized and unpolarized CP violation asymmetries for the said decay. Our results indicate that the value of unpolarized and polarized CP-violation asymmetries are considerable in both ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ and ${\Lambda }_b\to \Lambda {\tau }^{+}{\tau }^{-}$ channels and hence they give clear indication of new physics arising from the neutral $Z^{\prime }$ gauge boson. It is hoped that the measurements of these CP-violating asymmetries will not only help us to relate new physics, but also help us to determine the precise values of the parameters of new gauge boson $Z^{\prime }$.

Comments: 15 pages, 8 figures. arXiv admin note: text overlap with arXiv:1401.2162