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

References in corpus (1)

• CP asymmetry, branching ratios and isospin breaking effects of B -> K* gamma with the perturbative QCD approach

Cited by in corpus (7)

• ${\Lambda }_b\to p,\Lambda$ transition form factors from QCD light-cone sum rules
• Distribution Amplitudes of the Lambda_b Baryon in QCD
• Lifetime of doubly charmed baryons
• Exclusive semileptonic decays of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in supersymmetric theories
• Rare decays of ${\Lambda }_b\to \Lambda \gamma$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in universal extra dimension model
• Charm Physics - A Field Full with Challenges and Opportunities
• Calculation of BR(${\bar{B}}^0\to {\Lambda }_c^{+}+\bar{p})$ in the PQCD Approach