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http://hdl.handle.net/2307/386
Title: | Model-independent Constraints on ΔF=2 Operators and the Scale of New Physics | Authors: | UTfit Collaboration Bona, M. Ciuchini, Marco Franco, E. Lubicz, V. Martinelli, G. Parodi, F. Pierini, M. Roudeau, P. Schiavi, C. Silvestrini, L. Sordini, V. Stocchi, A. Vagnoni, V. |
Keywords: | Beyond Standard Model Heavy Quark Physics B-Physics Kaon Physics |
Issue Date: | Mar-2008 | Abstract: | We update the constraints on new-physics contributions to ΔF = 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 ΔF = 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 ΔF = 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. | URI: | http://hdl.handle.net/2307/386 | DOI: | 10.1088/1126-6708/2008/03/049 |
Appears in Collections: | A - Articolo su rivista X_Dipartimento di Fisica 'Edoardo Amaldi' |
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