Semileptonic decay Lambda_c-->Lambda \ell^+ νfrom QCD light-cone sum rules

Details Semileptonic decay Lambda_c-->Lambda \ell^+ νfrom QCD light-cone sum rules Semileptonic decay Lambda_c-->Lambda \ell^+ νfrom QCD light-cone sum rules

2006-08-15

arxiv.org/abs/hep-ph/0608170v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex4, 8 pages, 5 figures, misprints corrected, mini changes in numerical results

Scientific paper

We present the study of the semileptonic decay \Lambda_c to \Lambda\ell^+\nu by using the light-cone sum rule approach. Distribution amplitudes (DAs) for the \Lambda baryon are discussed to the leading order conformal spin, and QCD sum rule estimate for the corresponding parameters is presented. The form factors describing the decay are calculated and used to predict the decay width and the decay asymmetry parameter \alpha. With the inclusion of twist-3 contributions the calculated decay width \Gamma=(7.2+/-2.0)X10^{-14} GeV as well as asymmetry \alpha=-(0.88+/-0.03) is found in good agreement with the experimental data, while there are appreciable deviations from experiment values when the higher twist contributions are included.

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