Institute for Theoretical Particle Physics (TTP)


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preprints:2009:ttp09-28 [2016/03/17 11:03] (current)
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 +====== TTP09-28 Chirally enhanced corrections to FCNC processes in the generic MSSM ====== 
 +   <hidden TTP09-28  Chirally enhanced corrections to FCNC processes in the generic MSSM > Chirally enhanced supersymmetric QCD corrections to FCNC processes are 
 + investigated in the framework of the MSSM with generic sources of flavor 
 + violation. These corrections arise from flavor-changing self-energy 
 + diagrams and can be absorbed into a finite renormalization of the 
 + squark-quark-gluino vertex. In this way enhanced two-loop and even 
 + three-loop diagrams can be efficiently included into a leading-order 
 + (LO) calculation. Our corrections substantially change the values of the 
 + parameters delta^{d,LL}_{23}, delta^{d,LR}_{23}, delta^{d,RL}_{23}, and 
 + delta^{d,RR}_{23} extracted from Br[B-&gt;X_s gamma] if tan(beta) is large. 
 + We find stronger (weaker) constraints compared to the LO result for 
 + negative (positive) values of mu. The constraints on 
 + delta^{d,LR,RL}_{13} and delta^{d,LR,RL}_{23} from B_d mixing and B_s 
 + mixing change drastically if the third-generation squark masses differ 
 + from those of the first two generations. K mixing is more strongly 
 + affected by the chirally enhanced loop diagrams and even sub-percent 
 + deviations from degenerate down and strange squark masses lead to 
 + profoundly stronger constraints on delta^{d,LR,RL}_{12}. 
 + </hidden> 
 +|**Andreas Crivellin and Ulrich Nierste**  |  
 +|** Phys.Rev. D81 095007 2010  **  | 
 +| {{preprints:2009:ttp09-28.pdf|PDF}} {{|PostScript}} [[|arXiv]]   | 
 +| |