Ak. Leibovich et al., PREDICTIONS FOR B-]D-1(2420)L(NU)OVER-BAR AND B-]D-2-ASTERISK(2460)L(NU)OVER-BAR AT ORDER LAMBDA(QCD) M(C,B)/, Physical review letters, 78(21), 1997, pp. 3995-3998
Exclusive semileptonic B decays into D-1 and D-2 mesons are investiga
ted including order Lambda(QCD)/m(c,b) corrections using the heavy qua
rk effective theory. At zero recoil, the Lambda(QCD)/m(c,b) correction
s can be written in terms of the leading Isgur-Wise function for these
transitions, tau, and known meson mass splittings. We obtain an almos
t model independent prediction for the shape of the spectrum near zero
recoil, including order Lambda(QCD)/m(c,b) corrections. We determine
tau(1) from the measured B --> <D(1)l(v)over bar> branching ratio. Imp
lications for B decay sum rules are discussed.