Model-independent bounds on the standard model effective theory from flavour physics

Publication date: 10 December 2019Source: Physics Letters B, Volume 799Author(s): Luca Silvestrini, Mauro ValliAbstractMeson-antimeson mixing provides the most stringent constraints on baryon- and lepton-number conserving New Physics, probing scales higher than 105 TeV. In the context of the effective theory of weak interactions, these constraints translate into severe bounds on the coefficients of ΔF=2 operators. Generalizing to the effective theory invariant under the Standard Model gauge group, valid above the electroweak scale, the bounds from ΔF=2 processes also affect ΔF=1 and even ΔF=0 operators, due to log-enhanced radiative corrections induced by Yukawa couplings. We systematically analyze the effect of the renormalization group evolution above the electroweak scale and provide for the first time the full set of constraints on all relevant dimension-six operators.

Source: Physics Letters B - November 6, 2019 Category: Physics Source Type: research