====== TTP09-26 Resummation of tan-beta-enhanced supersymmetric loop corrections beyond the decoupling limit ======
 
 
   <hidden TTP09-26  Resummation of tan-beta-enhanced supersymmetric loop corrections beyond the decoupling limit > We study the Minimal Supersymmetric Standard Model with Minimal
   Flavour Violation for the case of a large parameter tan beta and
   arbitrary values of the supersymmetric mass parameters. We derive
   several resummation formulae for tan-beta-enhanced loop
   corrections, which were previously only known in the limit of
   supersymmetric masses far above the electroweak scale. Studying first
   the renormalisation-scheme dependence of the resummation formula for
   the bottom Yukawa coupling, we clarify the use of the sbottom mixing
   angle in the supersymmetric loop factor Delta_b. As a new feature,
   we find tan-beta-enhanced loop-induced flavour-changing neutral
   current (FCNC) couplings of gluinos and neutralinos which in turn give
   rise to new effects in the renormalisation of the
   Cabibbo-Kobayashi-Maskawa matrix and in FCNC processes of B mesons.
   For the chromomagnetic Wilson coefficient C8, these gluino-squark
   loops can be of the same size as the known chargino-squark
   contribution. We discuss the phenomenological consequences for the
   mixing-induced CP asymmetry in B_d -> phi K_S. We further quote
   formulae for B_s -> mu mu and B <-> anti-B mixing valid beyond the
   decoupling limit and find a new contribution affecting the phase of
   the B <-> anti-B mixing amplitude. Our resummed tan-beta-enhanced effects are
   cast into Feynman rules permitting an easy implementation in automatic
   calculations.
 </hidden>
|**Lars Hofer, Ulrich Nierste and Dominik Scherer**  | 
|**  JHEP  0910 081 2009  **  |
| {{preprints:2009:ttp09-26.pdf|PDF}} {{preprints:2009:ttp09-26.ps|PostScript}} [[http://arxiv.org/abs/0907.5408|arXiv]]   |
| |