Institut für Theoretische Teilchenphysik
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Institute for Theoretical Particle Physics (TTP)
Institute for Theoretical Particle Physics (TTP)
Institute for Theoretical Particle Physics (TTP)
Preprints
2008
TTP08-41 Supersymmetric renormalisation of the CKM matrix and new constraints on the squark mass matrices
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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]]   | 
 +| |