Theoretical predictions of beauty hadron lifetimes, based on the heavy quark expansion up to and including order 1/m(b)(2) do not to reproduce the experimental measurements of the lifetime ratios tau (B+) /tau (B-d) and tau (Lambda(b)) /tau (B-d). Large corrections to these predictions come from phasespace enhanced 1/m(b)(3) contributions, i.e., hard spectator effects. In this paper we calculate the next to-leading order QCD corrections to the Wilson coefficients of the local operators appearing at O(1/m(b)(3)). We find that these corrections improve the agreement with the experimental data. The O(1/m(b)(3)) lifetime ratio of charged to neutral B-mesons, tau (B+) /tau (B-d), turns out to be in very good agreement with the corresponding measurement, whereas for tau (B-s) /tau (B-d) and tau (Lambda(b)) /tau (B-d) there is a residual difference at the 1sigma level. We discuss, however, why the theoretical predictions are less accurate in the latter cases.

Ciuchini, M., Franco, E., Lubicz, V., Mescia, F. (2002). Next-to-leading order QCD corrections to spectator effects in lifetimes of beauty hadrons. NUCLEAR PHYSICS. B, 625(1-2), 211-238 [10.1016/S0550-3213(02)00006-8].

Next-to-leading order QCD corrections to spectator effects in lifetimes of beauty hadrons

LUBICZ, Vittorio;
2002-01-01

Abstract

Theoretical predictions of beauty hadron lifetimes, based on the heavy quark expansion up to and including order 1/m(b)(2) do not to reproduce the experimental measurements of the lifetime ratios tau (B+) /tau (B-d) and tau (Lambda(b)) /tau (B-d). Large corrections to these predictions come from phasespace enhanced 1/m(b)(3) contributions, i.e., hard spectator effects. In this paper we calculate the next to-leading order QCD corrections to the Wilson coefficients of the local operators appearing at O(1/m(b)(3)). We find that these corrections improve the agreement with the experimental data. The O(1/m(b)(3)) lifetime ratio of charged to neutral B-mesons, tau (B+) /tau (B-d), turns out to be in very good agreement with the corresponding measurement, whereas for tau (B-s) /tau (B-d) and tau (Lambda(b)) /tau (B-d) there is a residual difference at the 1sigma level. We discuss, however, why the theoretical predictions are less accurate in the latter cases.
2002
Ciuchini, M., Franco, E., Lubicz, V., Mescia, F. (2002). Next-to-leading order QCD corrections to spectator effects in lifetimes of beauty hadrons. NUCLEAR PHYSICS. B, 625(1-2), 211-238 [10.1016/S0550-3213(02)00006-8].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/150076
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