Improved analysis of the rare decay processes of Λb

Ren-hao Deng,Yong-lu Liu,Ming-qiu Huang

Table 3. Branch ratio of the process ${{\rm{\Lambda }}}_{b}\to {\rm{\Lambda }}\gamma $ with different models.

${\rm{Model}}$ ${\rm{Branch}}\,{\rm{Ratio}}$ ${\rm{CZ-type}}\,{\rm{current}}$ $({2.57}_{-0.09}^{+0.09})\times {10}^{-4}$ ${\rm{Ioffe-type}}\,{\rm{current}}$ $({7.38}_{-0.39}^{+0.40})\times {10}^{-6}$ ${\rm{Pole}}\,{\rm{model}}$ [13] $(0.10\sim 0.45)\times {10}^{-5}$ ${\rm{QCD}}\,{\rm{sum}}\,{\rm{rule}}$ [17] $(3.7\pm 0.5)\times {10}^{-5}$ ${\rm{COQM}}$ [48] $0.23\times {10}^{-5}$ ${\rm{HQET}}$ [14] $(1.2\sim 1.9)\times {10}^{-5}$ ${\rm{Bag}}\,{\rm{model}}$ [14] $0.6\times {10}^{-5}$ ${\rm{PQCD}}$ [18] $(4.3\sim 6.8)\times {10}^{-8}$ ${\rm{PDG}}$ [1] $(7.1\pm 1.7)\times {10}^{-6}$