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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]] ​  | 
 +| |