Improved Light-cone QCD Sum Rule Analysis Of The Rare Decays ${\Lambda }_b\to \Lambda \gamma$ And ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$

Abstract

We present a systematic light-cone QCD sum rule study of the exclusive rare radiative decay ${\Lambda }_b\to \Lambda \gamma$ and rare semileptonic decay ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ within the framework of the standard model. Although some LCSR studies on these rare processes can be found in different literatures, it is necessary to reanalyze them systematically for the reason that either the baryonic distribution amplitudes are improved or different interpolating currents for the ${\Lambda }_b$ baryon may lead to quite different results. In addition, the rare process ${\Lambda }_b\to \Lambda \gamma$ has not yet been analyzed by LCSR with the Ioffe-type current. Taking all these reasons into account, we perform LCSR calculations of both the processes with two types of interpolating currents. Our calculations show that the choice of the interpolating current for the ${\Lambda }_b$ baryon can affect the predictions significantly, especially for the rare radiative decay process.

21 pages,4 figures

References in corpus (5)

• Nucleon Form Factors in QCD
• PQCD Calculation for ${\Lambda }_b\to \Lambda \gamma$ in the Standard Model
• Distribution amplitudes of $\Sigma$ and $\Lambda$ and their electromagnetic form factors
• Light-cone QCD sum rule approach for the $\Xi$ baryon electromagnetic form factors and the semileptonic decay Xi_c->Xi e^+nu_e
• Radiative decays of the $(0^{+},1^{+})$ strange-bottom mesons

Cited by in corpus (16)

• Perturbative Corrections to ${\Lambda }_b\to \Lambda$ Form Factors from QCD Light-Cone Sum Rules
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• First observation of the radiative decay ${\Lambda }_b^0\to \Lambda \gamma$
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ and ${\Lambda }_b\to \Lambda \gamma$ decays in the relativistic quark model
• Analysis of the semileptonic decay Λ_c->ne^+ν_e
• Higher order light-cone distribution amplitudes of the Lambda baryon
• Form factors and decay rate of $B_c^{\ast }\to D_s{l}^{+}{l}^{-}$ decays in the QCD sum rules
• FCNC transitions of ${\Lambda }_b$ to neutron in Bethe-Salpeter equation approach
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decay in the Bethe-Salpeter equation approach
• The ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decay in the aligned two-Higgs-doublet model
• Rare ${\Lambda }_c$ decays and new physics effects
• Form factors for the rare $Λ_{b}(Λ_{b}^*)\rar N\ell^+\ell^- $ decays in light cone QCD sum rules
• Analysis of Angular Observables of ${\Lambda }_b\to \Lambda (\to p\pi ){\mu }^{+}{\mu }^{-}$ Decay in Standard and $Z^{\prime }$ Models
• Higher Order Corrections to the Light-cone Distribution Amplitudes of the Sigma baryon
• Angular distribution of ${\Lambda }_b^0\to p{K}^{-}{\ell }^{+}{\ell }^{-}$ decays comprising $\Lambda$ resonances with spin up to $\le 5/2$
• Analysis of the radiative ${\Lambda }_b\to \Lambda \gamma$ transition in SM and scenarios with one or two universal extra dimensions