Analysis of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ rare decays in a non-universal $Z^{\prime }$ model

Abstract

We investigate the rare baryonic ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decays in a non-universal $Z^{\prime }$ model, which is one of the well-motivated extensions of the standard model (SM). Considering the effects of $Z^{\prime }$-mediated flavour-changing neutral currents (FCNCs) we analyse the differential decay rate, forward-backward asymmetries and lepton polarisation asymmetries for the ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decays. We find significant deviations from their SM predictions, which could indicate new physics arising from the $Z^{\prime }$ gauge boson.

20 pages, 7 figures, 3 tables, It is accepted and to be published in Chinese Physics C

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