Lifetime differences and CP violation parameters of neutral B mesons at the next-to-leading order in QCD

By Marco Ciuchini, V. Lubicz, C. Tarantino, E. Franco, F. Mescia. 2003

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We compute the next-to-leading order QCD corrections to the off-diagonal elements of the decay-width matrix Γ entering the neutral B-meson oscillations. From this calculation the width differences ΔΓ and the CP violation parameters (q/p) of B d and B s mesons are estimated, including the complete (αs) QCD corrections and the 1/m b contributions. For the width difference ΔΓs we agree with previous results. By using the lattice determinations of the relevant hadronic matrix elements we obtain the theoretical predictions ΔΓ d /Γ d = (2.42±0.59) × 10−3 and ΔΓ s /Γ s = (7.4±2.4) × 10−2 . For the CP violation parameters, we find |(q/p) d |−1 = (2.96±0.67) × 10−4 and |(q/p) s |−1 = −(1.28±0.27) × 10−5 . These predictions are compatible with the experimental measurements which, however, suffer at present from large uncertainties.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/224c1187bf2d0e63465d86d835e1b2a0fb69aa68

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