PQCD Calculation for ${\Lambda }_b\to \Lambda \gamma$ in the Standard Model

Abstract

We calculate the branching ratio of ${\Lambda }_b\to \Lambda \gamma$ in the standard model using the PQCD method. The predicted branching ratio $B({\Lambda }_b\to \Lambda \gamma )$ is about $(4.3\sim 8.6)\times 10^{-8}$, with reasonable parameter ranges in the heavy baryon distribution amplitude. This branching ratio is much smaller than those obtained in other hadronic model calculations. Future experimental data can provide important information on applicability of the PQCD method to heavy baryon radiative decay.

12 pages, 1 figure and 5 tables. Replaced by new version

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Cited by in corpus (37)

• Physics at a future Neutrino Factory and super-beam facility
• ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks
• Next-to-leading-order corrections to $B\to \pi$ form factors in $k_T$ factorization
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• Perturbative Corrections to ${\Lambda }_b\to \Lambda$ Form Factors from QCD Light-Cone Sum Rules
• 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 Decays of Λ_b->Λ+ γand Λ_b ->Λ+ l^{+} l^{-} in the Light-cone Sum Rules
• Anatomy of the pQCD Approach to the Baryonic Decays ${\Lambda }_b\to p\pi ,pK$
• ${\Lambda }_b\to p,\Lambda$ transition form factors from QCD light-cone sum rules
• QCD calculations of $B\to \pi ,K$ form factors with higher-twist corrections
• Distribution Amplitudes of the Lambda_b Baryon in QCD
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• Lifetime of doubly charmed baryons
• Exclusive semileptonic decays of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in supersymmetric theories
• Subleading power corrections to the pion-photon transition form factor in QCD
• Rare decays of ${\Lambda }_b\to \Lambda \gamma$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in universal extra dimension model
• ${\Lambda }_b\to p$ transition form factors in perturbative QCD
• Improved Light-cone QCD Sum Rule Analysis Of The Rare Decays ${\Lambda }_b\to \Lambda \gamma$ And ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Charm Physics - A Field Full with Challenges and Opportunities
• Calculation of BR(${\bar{B}}^0\to {\Lambda }_c^{+}+\bar{p})$ in the PQCD Approach
• 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
• Weak Radiative Decays of Anti-triplet Bottomed Baryons in Light-Front Quark Model
• Estimates of exchange topological contributions and $CP$-violating observables in ${\Lambda }_b\to \Lambda \varphi$ decay
• Lepton polarization asymmetries for FCNC decays of the ${\Lambda }_b$ baryon
• Searching for tetraquark through weak decays of b-baryons
• Charmonium decays of beauty baryons in the perturbative QCD approach
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• Radiative $b$-baryon decays to measure the photon and $b$-baryon polarization
• Rapidity resummation for $B$-meson wave functions
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• Mixing effects of $\eta -{\eta }^{\prime }$ in ${\Lambda }_b\to \Lambda {\eta }^{{(}^{\prime })}$ decays
• Estimates of the isospin-violating ${\Lambda }_b\to {\Sigma }^0\varphi ,{\Sigma }^{0}J/\psi$ decays and the $\Sigma -\Lambda$ mixing
• Low energy pion-${\Lambda }_b$ interaction
• Probing new physics effects in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ decay via model independent approach
• Semileptonic neutral current decays of ${\Xi }_b$ with dileptons or dineutrinos in the final state
• ${\Xi }_b\to \Xi$ form factors from lattice QCD and Standard-Model predictions for ${\Xi }_b\to \Xi {\mu }^{+}{\mu }^{-}$ and ${\Xi }_b\to \Xi \gamma$ decays