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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
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.
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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