Next-to-Leading Order QCD Corrections to Spectator Effects in Lifetimes of Beauty Hadrons

Abstract

Theoretical predictions of beauty hadron lifetimes, based on the heavy quark expansion up to and including order 1/mb^2, do not to reproduce the experimental measurements of the lifetime ratios tau(B+)/tau(Bd) and tau(Lambdab)/tau(Bd). Large corrections to these predictions come from phase-space enhanced 1/mb^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/mb^3). We find that these corrections improve the agreement with the experimental data. The lifetime ratio of charged to neutral B mesons, tau(B+)/tau(Bd), turns out to be in very good agreement with the corresponding measurement, whereas for tau(Bs)/tau(Bd) and tau(Lambdab)/tau(Bd) there is a residual difference at the 1-sigma level. We discuss, however, why the theoretical predictions are less accurate in the latter cases.

29 pages, 7 figures, uses epsf. Misprints in eqs. (28) and (52) corrected. Results unchanged. Final version to appear on Nucl.Phys.B

Cited by in corpus (18)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Flavor Physics in the Quark Sector
• Lifetime Differences and CP Violation Parameters of Neutral B Mesons at the Next-to-Leading Order in QCD
• Spectator effects and lifetimes of heavy hadrons
• Dimension-six matrix elements for meson mixing and lifetimes from sum rules
• Lifetime Ratios of Beauty Hadrons at the Next-to-Leading Order in QCD
• Delta F = 2 observables and B -> X_q gamma decays in the Left-Right Model: Higgs particles striking back
• D-meson lifetimes within the heavy quark expansion
• Lambda_b lifetime puzzle in heavy-quark expansion
• $SU(3)$ breaking effects in $B$ and $D$ meson lifetimes
• Lifetimes of singly charmed hadrons
• The width difference in the $B-\bar{B}$ system at next-to-next-to-leading order of QCD
• Revisiting lifetimes of doubly charmed baryons
• B-Meson Mixing and Lifetimes
• A novel determination of the $B_c$ lifetime
• HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model