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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]] | | ||

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