2003/10/31 by Gudrun Hiller, G. Hiller, Frank Krüger +1 · 6 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.69.074020
published as Phys.Rev.D69:074020,2004 · 28 pages, 6 figures; Table 1 updated, two refs added (to appear in PRD)
arxiv created 2004/01/09 · openalex publication_date 2004/04/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study model-independently the implications of nonstandard scalar and pseudoscalar interactions for the decays \stackrel\ensuremath→bs\ensuremathγ, \stackrel\ensuremath→bsg, \stackrel\ensuremath→bsl+l^\ensuremath- (l=e,\ensuremathμ) and Bs\ensuremath→\ensuremathμ+\ensuremathμ^\ensuremath-. We find sizable renormalization effects from scalar and pseudoscalar four-quark operators in the radiative decays and at O(\ensuremathαs) in hadronic b decays. Constraints on the Wilson coefficients of an extended operator basis are worked out. Further, the ratios RH=B(\stackrel\ensuremath→BH\ensuremathμ+\ensuremathμ^\ensuremath-)/B(\stackrel\ensuremath→BHe+e^\ensuremath-), for H=K(*),Xs, and their correlations with the Bs\ensuremath→\ensuremathμ+\ensuremathμ^\ensuremath- decay are investigated. We show that the standard model prediction for these ratios defined with the same cut on the dilepton mass for electron and muon modes, RH=1+O(m_\ensuremathμ2/mb2), has a much smaller theoretical uncertainty (\ensuremath\lesssim1%) than the one for the individual branching fractions. The present experimental limit RK<~1.2 puts constraints on scalar and pseudoscalar couplings, which are similar to the ones from current data on B(Bs\ensuremath→\ensuremathμ+\ensuremathμ^\ensuremath-). We find that new physics corrections to R_K* and R_Xs can reach 13% and 10%, respectively.