Institute for Theoretical Particle Physics (TTP)

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preprints:2009:ttp09-26 [2016/03/17 11:03] (current)
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 +====== TTP09-26 Resummation of tan-beta-enhanced supersymmetric loop corrections beyond the decoupling limit ====== 
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 +   <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]]   | 
 +| |