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preprints:2008:ttp08-41 [2016/03/17 11:03] (current)
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 +====== TTP08-41 Supersymmetric renormalisation of the CKM matrix and new constraints on the squark mass matrices ====== 
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 +   <​hidden TTP08-41 ​ Supersymmetric renormalisation of the CKM matrix and new constraints on the squark mass matrices > We compute the finite renormalisation of the Cabibbo-Kobayashi-Maskawa 
 + (CKM) matrix induced by gluino-squark diagrams in the MSSM with 
 + ​non-minimal sources of flavour violation. Subsequently we derive bounds 
 + on the flavour-off-diagonal elements of the squark mass matrices by 
 + ​requiring that the radiative corrections to the CKM elements do not 
 + ​exceed the experimental values. ​ Our constraints on the associated 
 + ​dimensionless quantities delta^{d LR}_{ij}, j>i, are stronger than the 
 + ​bounds from flavour-changing neutral current (FCNC) processes if gluino 
 + and squarks are heavier than 500 GeV. Our bound on |delta^{u LR}_{12}| 
 + is stronger than the FCNC bound from D-D-bar mixing for superpartner 
 + ​masses above 900 GeV.  We further find a useful bound on |delta_{13}^{u 
 + LR}|, for which no FCNC constraint is known. ​ Our results imply that it 
 + is still possible to generate all observed flavour violation from the 
 + soft supersymmetry-breaking terms without conflicting with present-day 
 + data on FCNC processes. ​ We suggest that a flavour symmetry renders the 
 + ​Yukawa sector flavour-diagonal and the trilinear supersymmetry-breaking 
 + terms are the spurion fields breaking this flavour symmetry. We further 
 + ​derive the dominant supersymmetric radiative corrections to the 
 + ​couplings of charged Higgs bosons and charginos to quarks and squarks. 
 + </​hidden>​ 
 +|**Andreas Crivellin and Ulrich Nierste** ​ |  
 +|**  Phys.Rev. ​ D79 035018 2009  **  | 
 +| {{preprints:​2008:​ttp08-41.pdf|PDF}} {{preprints:​2008:​ttp08-41.ps|PostScript}} [[http://​arxiv.org/​abs/​0810.1613|arXiv]] ​  | 
 +| |