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SUMMARY:Superpotential de-sequestering as a source of flavour violation - 
 Witkowski\, L (University of Oxford)
DTSTART:20120628T153000Z
DTEND:20120628T154500Z
UID:TALK38727@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Non-perturbative effects such as gaugino condensation on a sta
 ck of D7-branes are an essential ingredient in several celebrated moduli-s
 tabilisation schemes in type IIB string theory. At the level of the four-d
 imensional effective theory\, the non-perturbative effects induce a non-pe
 rturbative superpotential. In particular\, new Yukawa interactions can be 
 generated. Type IIB orbifold models contain the essential features to stud
 y these non-perturbative corrections to the superpotential in string compa
 ctifications. I will describe under which conditions new Yukawa couplings 
 arise in these settings and generalise the results to more realistic strin
 g models. Most importantly\, I will show that the flavour structure of the
  induced Yukawa couplings is not aligned with the tree-level flavour struc
 ture\, thus introducing a new source of flavor violation.\n\n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
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