2002/10/21 by Joerg Urban, Urban, Joerg
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0210286
7 pages, 2 figures, To appear in the proceedings of the 10th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY02)
arxiv created 2002/10/21 · openalex publication_date 2002/10/21 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
It is well known that the Minimal Supersymmetric Standard Model (MSSM) can enhance Br[Bd,s->mu+ mu-] by orders of magnitude, even if we assume the Cabibbo-Kobayashi-Maskawa (CKM) matrix to be the only source of flavour violation. Of particular interest is the quantity R=Br[Bd->mu+ mu-]/Br[Bs->mu+ mu-], since (i) the theoretical errors cancel to a large extent, and (ii) it offers a theoretically clean way of extracting the ratio |Vtd/Vts| in the Standard Model, which predicts RSM ~ |Vtd/Vts|2 \~ O(10-2). Exploring three different scenarios of modified minimal flavour violation, we find that part of the MSSM parameter space can accommodate large Bd,s->mu+ mu- branching fractions, while being consistent with various experimental constraints. More importantly, we show that the ratio R can be as large as O(1), while the individual branching fractions may be amenable to detection by ongoing experiments. We conclude that within the MSSM with large tan[beta] the decay rates of Bd,s->mu+ mu- be of comparable size even in the case where flavour violation is due solely to the CKM matrix.