QCD Sum Rule Analysis for the \Lambda_b to \Lambda_c Semileptonic Decay
  The 1/m_c and 1/m_b corrections to the \Lambda_b to \Lambda_c semi- leptonic decay are analyzed by QCD sum rules. Within the framework of heavy quark effective theory,the subleading baryonic Isgur-Wise func- tion of \Lambda_b to \Lambda_c has been calculated. It is shown that the corrections due to the 1/m Lagrangian insertion are negligibly small. The sizable 1/m_Q effect to the decay lies only in the weak current. The decay spectrum and the branching ratio are given. 
Yuan-ben Dai, Chao-shang Huang, Ming-qiu Huang, and Chun Liu