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[en] We perform a dynamical lattice computation of the Isgur-Wise functions τ1/2 and τ3/2 at zero recoil. We consider three different light quark masses corresponding to 300 MeV< or similar mPS< or similar 450 MeV, which allow us to extrapolate our results to the physical u/d quark mass. We find τ1/2(1)=0.296(26) and τ3/2(1)=0.526(23). Uraltsev's sum rule is saturated up to 80% by the ground state. We discuss implications regarding semileptonic decays B→ Xclν and the associated ''1/2 versus 3/2'' puzzle. (orig.)
Source
Mar 2009; 23 p; SFB-CPP--09-26; LPT-ORSAY--09-17; HU-EP--09-12; ISSN 0418-9833; 