Institute for Theoretical Particle Physics (TTP)


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preprints:2009:ttp09-04 [2016/03/17 11:03] (current)
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 +====== TTP09-04 EDM constraints on flavored CP-violating phases ====== 
 +   <hidden TTP09-04  EDM constraints on flavored CP-violating phases > The CP-violating phenomenology of the MSSM with Minimal Flavor Violation (MFV) 
 + in the lepton sector is revisited. To this end, the most general 
 + parametrizations of the slepton soft-breaking terms are constructed assuming a 
 + seesaw mechanism of type I. After a critical reassessment of how the 
 + CP-symmetry is broken within the MFV framework, all possible CP-violating 
 + phases are introduced. From the strong hierarchy of their contributions to the 
 + Electric Dipole Moments (EDMs), these phases are split into three classes: 
 + flavor-blind, flavor-diagonal and flavor off-diagonal. In particular, the 
 + phases from the neutrino sector belong to the last class; they start to 
 + contribute only at the second order in the mass-insertion approximation and 
 + have thus a negligible effect. It is then shown that to each class of phases 
 + corresponds a unique largely dominant term in the MFV expansion. Numerically, 
 + for a realistic range of MSSM and neutrino parameters, such that B(mu --> e 
 + gamma) does not exceed its experimental bound, the three types of phases are 
 + found to be allowed by the current bound on the electron EDM, though the next 
 + generation of experiments should constrain tightly the flavor-blind 
 + phase. Finally, we relax the MFV hypothesis and show how in the general MSSM, 
 + the MFV operator basis can be used to judge of the naturality of the slepton 
 + soft-breaking terms. 
 + </hidden> 
 +|**Mercolli, Lorenzo and Smith, Christopher**  |  
 +|**  Nucl.Phys.  B817 1-24 2009  **  | 
 +| {{preprints:2009:ttp09-04.pdf|PDF}} {{|PostScript}} [[|arXiv]]   | 
 +| |