Decay ${\Lambda }_b\to pl\bar{\nu }$ in QCD sum rules

Abstract

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 ${\Lambda }_b\to pl\bar{\nu }$ has been calculated. The decay width is given.

Comments: 6 pages Latex file, 4 figures, corrected file forms