Perturbative QCD calculation forΛb→Λγin the standard model

2006/06/30 by Xiao-Gang He, Tong Li, Xue-Qian Li +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.74.034026

published as Phys.Rev. D74 (2006) 034026 · 12 pages, 1 figure and 5 tables. Replaced by new version

arxiv created 2006/08/09 · openalex publication_date 2006/08/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We calculate the branching ratio of \ensuremathΛ_b\ensuremath→\ensuremathΛ\ensuremathγ in the standard model using the PQCD method. The predicted branching ratio B(\ensuremathΛ_b\ensuremath→\ensuremathΛ\ensuremathγ) is about (4.3\ensuremath∼8.6)\ifmmode×\else\texttimes\fi10^\ensuremath-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.

Citations

• Implications ofb→sγDecay Measurements in Testing the Higgs Sector of the Minimum Supersymmetric Standard Model
• Measurement of the Λb0 decay form factor
• QCD factorization in B→πK, ππ decays and extraction of Wolfenstein parameters
• Nonfactorizable contributions toB→D(*)Mdecays
• QCD Factorization forB→ππDecays: Strong Phases andCPViolation in the Heavy Quark Limit
• Measurement of Branching Fractions and CP and Isospin Asymmetries in B → K^* γ
• QCD factorization for exclusive non-leptonic B-meson decays: general arguments and the case of heavy–light final states
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by

• Physics at a future Neutrino Factory and super-beam facility