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 1029-8479. - 3(2008), pp. 13-28. [10.1088/1126-6708/2008/03/049]

Model-independent constraints on Delta F=2 operators and the scale of new physics

Martinelli, Guido;
2008-01-01

Abstract

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.
2008
3
13
28
049
http://www.scopus.com/inward/record.url?eid=2-s2.0-43049148058∂nerID=65&md5=fe8008de7e17cf9871480d50c3b1f7e5
M., Bona; M., Ciuchini; E., Franco; V., Lubicz; Martinelli, Guido; F., Parodi; M., Pierini; P., Roudeau; C., Schiavi; L., Silvestrini; V., Sordini; A....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/33082
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