Probing penguin coefficients with the lifetime ratio tau(B_s)/tau(B_d)

Abstract

We calculate penguin contributions to the lifetime splitting between the B_s and the B_d meson. In the Standard Model the penguin effects are found to be opposite in sign, but of similar magnitude as the contributions of the current-current operators, despite of the smallness of the penguin coefficients. We predict tau(B_s)/tau(B_d) -1 = ( -1.2 +/- 10.0 ) * 10^(-3) * (f_{B_s}/190 MeV)^2 where the error stems from hadronic uncertainties. Since penguin coefficients are sensitive to new physics and poorly tested experimentally, we analyze the possibility to extract them from a future precision measurement of tau(B_s)/tau(B_d). Anticipating progress in the determination of the hadronic parameters epsilon_1, epsilon_2 and f_{B_s}/f_{B_d} we find that the coefficient C_4 can be extracted with an uncertainty of order |Delta C_4|= 0.1 from the double ratio (tau(B_s)-tau(B_d))/(tau(B^+)-tau(B_d)), if |epsilon_1-epsilon_2| is not too small.

14 pages, 6 figures, LaTex 2e, uses jeep.sty, a4wide.sty, a4.sty, fancyheadings.sty, cite.sty, epsf.sty, rotate.sty, times.sty

References in corpus (2)

• Charming Penguins in B decays
• Penguin Diagrams, Charmless B-Decays and the ``Missing Charm Puzzle''

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