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EnglishWe update the constraints on new-physics contributions to Delta F = 2 processes from the generalized unitarity triangle analysis, including the most recent experimental developments. Based on these constraints, we derive upper bounds on the coefficients of the most general Delta F = 2 effective Hamiltonian. These upper bounds can be translated into lower bounds on the scale of new physics that contributes to these low-energy effective interactions. We point out that, due to the enhancement in the renormalization group evolution and in the matrix elements, the coefficients of non-standard operators are much more constrained than the coefficient of the operator present in the Standard Model. Therefore, the scale of new physics in models that generate new Delta F = 2 operators, such as next-to-minimal flavour violation, has to be much higher than the scale of minimal flavour violation, and it most probably lies beyond the reach of direct searches at the LHC.
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| Titolo: | Model-independent constraints on Delta F=2 operators and the scale of new physics |
| Autori: | |
| Data di pubblicazione: | 2008 |
| Rivista: | |
| Handle: | http://hdl.handle.net/11573/15953 |
| Appartiene alla tipologia: | 01a Articolo in rivista |
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http://hdl.handle.net/11573/15953
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