Semi-leptonic B-decays and the two-pion distribution amplitudes

Abstract

We show that the semi-leptonic decay B+ -> pi+ pi- l+ \nu_l can be used as a source of information for two-pion distribution amplitudes. The connection between these amplitudes and the B-meson decay width is achieved by the light cone sum rule method. We show the relevant distribution amplitudes and give the formula for the decay width.

Comments: 8 pages, 4 figures, LaTeX, two minor typos in the text corrected, two references updated. Version to be published in EJPC