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Journal of High Energy Physics 03 (2008) 049
Model-independent constraints on $\delta$ F = 2 operators and the scale of new physics
M. Bona1, M. Ciuchini2, E. Franco2, V. Lubicz2, G. Martinelli2, F. Parodi3, M. Pierini4, P. Roudeau5, C. Schiavi3, L. Silvestrini2, V. Sordini5, A. Stocchi5, V. Vagnoni6
UTfit Collaboration(s)

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.
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2 :  INFN, Sezione di Roma 3 - Istituto Nazionale di Fisica Nucleare, Sezione di Roma 3
3 :  INFN, Sezione di Genova - Istituto Nazionale di Fisica Nucleare, Sezione di Genova
4 :  CERN - European Organization for Nuclear Research
5 :  LAL - Laboratoire de l'Accélérateur Linéaire
6 :  INFN, Sezione di Bologna - Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Physique/Physique des Hautes Energies - Phénoménologie
Beyond Standard Model – Heavy Quark Physics – B-Physics – Kaon Physics
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