2012/05/31 by Arnd Behring, Christian Groß, Christian Gross +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1007/jhep08(2012)152
v2: 21 pages, 5 figures; Eq (A.2) and chirality-flipping mass insertion results clarified, references added, conclusions unchanged
openalex publication_date 2012/08/01 · arxiv created 2012/08/29 · arxiv updated 2015/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Recent experimental and theoretical progress regarding B --> K(*) l+ l- decays led to improved bounds on the Wilson coefficients C9 and C10 of four-fermion operators of the |Delta B|=|Delta S|=1 effective Hamiltonian. We analyze the resulting implications on squark flavor violation in the MSSM and obtain new constraints on flavor-changing left-right mixing in the up-squark-sector. We find the dimensionless flavor mixing parameter (deltau23)LR, depending on the flavor-diagonal MSSM masses and couplings, to be as low as \lesssim 0.1. This has implications for models based on radiative flavor violation and leads to BR(Bs --> mu+ mu-) \gtrsim 1 x 10-9. Rare top decays t --> c gamma, t --> c g, t --> c Z have branching ratios predicted to be below \lesssim few times 10-8, 10-6 and 10-7, respectively.