Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$

Abstract

We study the effect of the FCNC mediated $Z$ boson in the rare semileptonic baryonic decays ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$. We consider the model where the standard model fermion sector is extended by an extra vector like down quark, as a consequence of which it allows CP violating Z mediated flavor changing neutral current at the tree level. We find that due to this non-universal $Zbs$ coupling, branching ratios of the rare semileptonic ${\Lambda }_b$ decays are enhanced reasonably from their corresponding standard model values and the zero point of the forward backward asymmetry for ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ is shifted to the left.

arXiv comment17 pages, 8 figures, to appear in EPJC

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Cited by in corpus (22)

• Analysis of $Λ_b \rar Λ\ell^+ \ell^-$ transition in SM4 using form factors from Full QCD
• B, D and K decays
• Weak decays of doubly heavy baryons: the FCNC processes
• A comprehensive analysis of weak transition form factors for doubly heavy baryons in the light front approach
• Effects of scalar leptoquark on semileptonic ${\Lambda }_b$ decays
• Investigation of the ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ transition in universal extra dimension using form factors from full QCD
• Effect of both Z and Z'-mediated flavor-changing neutral currents on the baryonic rare decay $lambd{a}_b$ decays into $lambda{l}^{+}{l}^{-}$
• Semileptonic Transition of $Σ_b \rar Σμ^+ μ^-$ in Family Non-universal $Z^{\prime }$ Model
• $B_s^0-{\bar{B}}_s^0$ mixing and $b\to s$ transitions in isosinglet down quark model
• Fourth generation effect on ${\Lambda }_b$ decays
• Constraint on compactification scale via recently observed baryonic ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ channel and analysis of the ${\Sigma }_b\to \Sigma {\ell }^{+}{\ell }^{-}$ transition in SM and UED scenario
• Signature of new physics in B -> phi pi decay
• FCNC transitions of ${\Lambda }_b$ to neutron in Bethe-Salpeter equation approach
• Effect of Z'-mediated flavor-changing neutral current on B decays into Pi Pi
• Analysis of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ rare decays in a non-universal $Z^{\prime }$ model
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decay in the Bethe-Salpeter equation approach
• Effect of both Z and Z^prime - mediated flavor-changing neutral currents on $B_s$ decays into $ta{u}^{+}ta{u}^{-}$
• Decay rate and asymmetries of ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$
• The ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decay in the ${\text{RS}}_c$ model
• Analysis of Angular Observables of ${\Lambda }_b\to \Lambda (\to p\pi ){\mu }^{+}{\mu }^{-}$ Decay in Standard and $Z^{\prime }$ Models
• Implication of Z-mediated FCNC on semileptonic decays $B_s\to \varphi l^{+}{l}^{-}$ and $B^{+}\to K^{+}{l}^{+}{l}^{-}$
• Forward-backward asymmetries in ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in Bethe-Salpeter equation approach