1998/10/19 by Y. -Y. Keum, Keum, Y. -Y.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9810407
9 pages with sprocl.sty, 5 figures. To appear in Proceedings of the Fourth International Workshop on Particle Physics Phenomeology at Kaoshieung, Taiwan, June 18-21, 1998
arxiv created 1998/10/19 · arxiv updated 2009/11/30
We consider penguin contributions to the lifetime splitting between the Bs and the Bd 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 (τ(Bs))/(τ(Bd)) -1 = \lt(-1.2 ± 10.0 \rt) ⋅ 10-3 ⋅ \lt(\fracfBs190 MeV \rt)2, \no 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 τ\lt(Bs \rt)/τ\lt(Bd\rt). Anticipating progress in the determination of the hadronic parameters ε1, ε2 and fBs/fBd we find that the coefficient C4 can be extracted with an uncertainty of order |ΔC4|≃ 0.1 from the double ratio [τ(Bs)-τ(Bd)]/[τ(B+)-τ(Bd)], if |ε1-ε2| is not too small.