The {bar B}{r_arrow}X{sub s}{gamma} photon spectrum
The {bar B}{r_arrow}X{sub s}{gamma} photon spectrum
The photon energy spectrum in inclusive weak radiative {bar B}{r_arrow}X{sub s}{gamma} decay is computed to order {alpha}{sub s}{sup 2}{beta}{sub 0}. This result is used to extract a value for the heavy quark effective theory (HQET) parameter {bar {Lambda}} from the average {l_angle}1{minus}2E{sub {gamma}}/m{sub B}{r_angle}, and a value of the parameter …