We 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.
Model-independent constraints on Delta F=2 operators and the scale of new physics / M., Bona; M., Ciuchini; E., Franco; V., Lubicz; Martinelli, Guido; F., Parodi; M., Pierini; P., Roudeau; C., Schiavi; L., Silvestrini; V., Sordini; A., Stocchi; V., Vagnoni; Utfit, Collaboration. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 0803:(2008), pp. 13-28. [10.1088/1126-6708/2008/03/049]
Scheda prodotto non validato
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
Titolo: | Model-independent constraints on Delta F=2 operators and the scale of new physics | |
Autori: | ||
Data di pubblicazione: | 2008 | |
Rivista: | ||
Citazione: | Model-independent constraints on Delta F=2 operators and the scale of new physics / M., Bona; M., Ciuchini; E., Franco; V., Lubicz; Martinelli, Guido; F., Parodi; M., Pierini; P., Roudeau; C., Schiavi; L., Silvestrini; V., Sordini; A., Stocchi; V., Vagnoni; Utfit, Collaboration. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 0803:(2008), pp. 13-28. [10.1088/1126-6708/2008/03/049] | |
Handle: | http://hdl.handle.net/11573/15953 | |
Appartiene alla tipologia: | 01a Articolo in rivista |