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We calculate penguin contributions to the lifetime splitting between the B_sand the B_d meson. In the Standard Model the penguin effects are found to beopposite in sign, but of similar magnitude as the contributions of thecurrent-current operators, despite of the smallness of the penguincoefficients. We predict  tau(B_s)/tau(B_d) -1 = ( -1.2 +/- 10.0 ) * 10^(-3) * (f_{B_s}/190 MeV)^2where the error stems from hadronic uncertainties. Since penguin coefficientsare sensitive to new physics and poorly tested experimentally, we analyze thepossibility to extract them from a future precision measurement oftau(B_s)/tau(B_d). Anticipating progress in the determination of the hadronicparameters epsilon_1, epsilon_2 and f_{B_s}/f_{B_d} we find that thecoefficient C_4 can be extracted with an uncertainty of order |Delta C_4|= 0.1from the double ratio (tau(B_s)-tau(B_d))/(tau(B^+)-tau(B_d)), if|epsilon_1-epsilon_2| is not too small.Comment: 14 pages, 6 figures, LaTex 2e, uses jeep.sty, a4wide.sty, a4.sty,  fancyheadings.sty, cite.sty, epsf.sty, rotate.sty, times.st

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Probing penguin coefficients with the lifetime ratio<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>τ</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo><mml:mo>/</mml:mo><mml:mi>τ</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:…

Probing penguin coefficients with the lifetime ratioτ(Bs)/τ(Bd)