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Model-independent constraints on $\delta$ F = 2 operators and the scale of new physics

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.
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http://hal.in2p3.fr/in2p3-00272060
Contributor : Sabine Starita <>
Submitted on : Friday, April 11, 2008 - 11:42:17 AM
Last modification on : Wednesday, September 16, 2020 - 4:20:33 PM

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M. Bona, M. Ciuchini, E. Franco, V. Lubicz, G. Martinelli, et al.. Model-independent constraints on $\delta$ F = 2 operators and the scale of new physics. Journal of High Energy Physics, Springer, 2008, 03, pp.049. ⟨10.1088/1126-6708/2008/03/049⟩. ⟨in2p3-00272060⟩

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