Rare decays of ${\Lambda }_b\to \Lambda \gamma$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in universal extra dimension model

Abstract

The exclusive weak decay of ${\Lambda }_b\to \Lambda \gamma$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ are investigated in the Applequist-Cheng-Dobrescu model, which is an extension of the standard model in presence of universal extra dimensions. Employing the transition form factors obtained in the light-cone sum rues, we analyze how the invariant mass distribution, forward-backward asymmetry and polarization asymmetry of $\Lambda$ baryon of these decay modes can be used to constrain the only one additional free parameter with respect to the standard model, namely, the radius $R$ of the extra dimension. Our results indicate that the Kaluza-Klein modes can lead to approximately 25% suppression of the branching ratio of ${\Lambda }_b\to \Lambda \gamma$, however, their contributions can bring about 10% enhancement to the decay rate of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$. It is shown that the zero-position of forward-backward asymmetry of ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ is sensitive to the compactification parameter $R$ in this scenario, while the measurement of polarizations of $\Lambda$ baryon in the ${\Lambda }_b$ decays is not suitable to provide some valuable information for the universal extra dimension model.

22 pages, 6 figures, two references added

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Cited by in corpus (26)

• Observation of the Baryonic Flavor-Changing Neutral Current Decay Lambda_b -> Lambda mu+ mu-
• Rare baryon decays Lambda_b -> Lambda l+ l- (l=e, mu, tau) and Lambda_b -> Lambda gamma : Differential and total rates, lepton- and hadron-side forward-backward asymmetries
• Rare $B_s$ decays to $\eta$ and ${\eta }^{\prime }$ final states
• 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 $lambda{l}^{+}{l}^{-}$
• Studying ${\mathcal{B}}_1({\frac{1}{2}}^{+})\to {\mathcal{B}}_2({\frac{1}{2}}^{+}){\ell }^{+}{\ell }^{-}$ Semi-leptonic Weak Baryon Decays with the SU(3) Flavor Symmetry
• Fourth generation effect on ${\Lambda }_b$ decays
• Lambda_b -> Lambda l+ l- decay within family non-universal Z' model
• 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
• B to strange tensor meson transition in a model with one universal extra dimension
• Double-Lepton Polarization Asymmetries and Branching Ratio in $B \rar K_{0}^{*}(1430) l^+ l^- $ transition from Universal Extra Dimension Model
• FCNC transitions of ${\Lambda }_b$ to neutron in Bethe-Salpeter equation approach
• Imprints of CP violation asymmetries in rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in family non-universal $Z^{\prime }$ model
• Semi-leptonic $B\to S$ decays in the standard model and in the universal extra dimension model
• $B\to K{\eta }^{(\prime )}\gamma$ decays in the standard model and in scenarios with universal extra dimensions
• Systematic analysis of the $B_s\to f_0{\ell }^{+}{\ell }^{-}$ in the universal extra dimension
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decay in the Bethe-Salpeter equation approach
• Analysis of ${\Lambda }_b\to$ $p{K}^{-}$ and $p{\pi }^{-}$ decays in a flavor changing $Z^{\prime }$ model
• Rare baryonic decays ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in the TTM model
• Rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in the two-Higgs doublet model of type-III
• Double-Lepton Polarization Asymmetries and Branching Ratio of the $B\rar γl^+ l^- $ transition in Universal Extra Dimension
• 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
• Bounds on the compactification scale of two universal extra dimensions from exclusive $b\to s\gamma$ decays
• Analysis of the radiative ${\Lambda }_b\to \Lambda \gamma$ transition in SM and scenarios with one or two universal extra dimensions
• Analysis of the semileptonic decays ${\Sigma }_b\to {\Sigma }_{c}l{\bar{\nu }}_l$, ${\Xi }_b^{\prime }\to {\Xi }_c^{\prime }l{\bar{\nu }}_l$ and ${\Omega }_b\to {\Omega }_{c}l{\bar{\nu }}_l$ in QCD sum rules