Decay $\Lambda_b \to p l \bar \nu$ in QCD sum rules
  The $\Lambda_b \to p$ semileptonic decay is analyzed by using QCD sum rules within the framework of heavy quark effective theory. The Isgur-Wise function of $\Lambda_b \to p l \bar\nu$ has been calculated. The decay width is given. 
Chao-Shang Huang, Cong-Feng Qiao, and Hua-Gang Yan