We consider the approximate U(2)3 avour symmetry exhibited by the quark sector of the Standard Model and all its possible breaking terms appearing in the quark Yukawa couplings. Taking an Effective Field Theory point of view, we determine the current bounds on these parameters, assumed to control the breaking of avour in a generic extension of the Standard Model at a reference scale Λ. In particular, a significant bound from ε'/ε is derived, which is relevant to Minimal Flavour Violation as well. In the upquark sector, the recently observed CP violation in D → π+π-, K+K- decays might be accounted for in this generic framework, consistently with any other constraint. © 2012 SISSA.
Barbieri R., Buttazzo D., Sala F., Straub D.M. (2012). Less minimal avour violation. JOURNAL OF HIGH ENERGY PHYSICS, 2012(10), -1-16 [10.1007/JHEP10(2012)040].
Less minimal avour violation
Sala F.;
2012
Abstract
We consider the approximate U(2)3 avour symmetry exhibited by the quark sector of the Standard Model and all its possible breaking terms appearing in the quark Yukawa couplings. Taking an Effective Field Theory point of view, we determine the current bounds on these parameters, assumed to control the breaking of avour in a generic extension of the Standard Model at a reference scale Λ. In particular, a significant bound from ε'/ε is derived, which is relevant to Minimal Flavour Violation as well. In the upquark sector, the recently observed CP violation in D → π+π-, K+K- decays might be accounted for in this generic framework, consistently with any other constraint. © 2012 SISSA.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
