We compute the next-to-leading order QCD corrections to spectator effects in the lifetime ratios of beauty hadrons. With respect to previous calculations, we take into account the non-vanishing value of the charm quark mass. We obtain the predictions tau (B+)/tau(B-d) = 1.06+/-0.02, tau(B-s)/tau(B-d) = 1.00+/-0.0 1 and tau(Lambda(b))/tau(B-d) = 0.90+/-0.05, in good agreement with the experimental results. In the case of tau(B-s)/tau(B-d) and tau(Lambda(b))/tau(B-d), however, some contributions, which either vanish in the vacuum insertion approximation or represent a pure NLO correction, have not been determined yet. (C) 2002 Elsevier Science B.V. All rights reserved.

Franco, E., Lubicz, V., Mescia, F., Tarantino, C. (2002). Lifetime ratios of beauty hadrons at the next-to-leading order in QCD. NUCLEAR PHYSICS. B, 633(1-2), 212-236 [10.1016/S0550-3213(02)00262-6].

Lifetime ratios of beauty hadrons at the next-to-leading order in QCD

LUBICZ, Vittorio;TARANTINO, CECILIA
2002-01-01

Abstract

We compute the next-to-leading order QCD corrections to spectator effects in the lifetime ratios of beauty hadrons. With respect to previous calculations, we take into account the non-vanishing value of the charm quark mass. We obtain the predictions tau (B+)/tau(B-d) = 1.06+/-0.02, tau(B-s)/tau(B-d) = 1.00+/-0.0 1 and tau(Lambda(b))/tau(B-d) = 0.90+/-0.05, in good agreement with the experimental results. In the case of tau(B-s)/tau(B-d) and tau(Lambda(b))/tau(B-d), however, some contributions, which either vanish in the vacuum insertion approximation or represent a pure NLO correction, have not been determined yet. (C) 2002 Elsevier Science B.V. All rights reserved.
2002
Franco, E., Lubicz, V., Mescia, F., Tarantino, C. (2002). Lifetime ratios of beauty hadrons at the next-to-leading order in QCD. NUCLEAR PHYSICS. B, 633(1-2), 212-236 [10.1016/S0550-3213(02)00262-6].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/121593
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 86
  • ???jsp.display-item.citation.isi??? 67
social impact