Global constraints on Yukawa operators in the standard model effective theory

Abstract

CP-violating contributions to Higgs-fermion couplings are absent in the standard model of particle physics (SM), but are motivated by models of electroweak baryogenesis. Here, we employ the framework of the SM effective theory (SMEFT) to parameterise deviations from SM Yukawa couplings. We present the leading contributions of the relevant operators to the fermionic electric dipole moments (EDMs). We obtain constraints on the SMEFT Wilson coefficients from the combination of LHC data and experimental bounds on the electron, neutron, and mercury EDMs. We perform, for the first time, a combined fit to LHC and EDM data allowing the presence of CP-violating contributions from several fermion species simultaneously. Among other results, we find non-trivial correlations between EDM and LHC constraints even in the multi-parameter scans, for instance, when floating the CP-even and CP-odd couplings to all third-generation fermions.

K → μ+μ− as a third kaon golden mode

“…We note that including corrections from CPV in mixing is possible, without harming the extraction of short-distance information, as demonstrated in Ref. [7]. Figure 1 shows the expected time dependence of the K → µ + µ − rate within the SM, illustrating the strength of the interference terms, which are the key to the extraction of Eq.…”

“…Various aspects of K → µ + µ − within the SM have been considered in Refs. [1,2,7,8,10], and implications for physics beyond the SM have been studied in Refs. [17,18,9,19].…”

“…where the non-parametric uncertainties are of the order of ∼ 1%. • Including effects of CPV in mixing results in an additional (parametric) uncertainty of order 3% [7].…”

“…Recent progress has demonstrated that (i) A measurement sensitive to interference effects in the time dependent K → µ + µ − rate can be used to extract the clean short-distance mode, B(K S → µ + µ − ) =0 , which amounts to a clean measurement of the CKM matrix element combination |V ts V td sin(β + β s )| ≈ |A 2 λ 5 η|, with current theory uncertainty of O(1%) [1,2,7].…”

The Low‐Scale Seesaw Solution to the MW$M_W$ and (g−2)μ$(g-2)_\umu$ Anomalies

“…Using these collider data, Ref. [45–47] performed a global fit obtaining a bound on a combination of $$\kappa _\umu$$ and $$\tilde{\kappa }_\umu$$, $$$$\begin{equation} 0.36 \lesssim \kappa ^2_\umu +\tilde{\kappa }^2_\umu \lesssim 1.85\,, \end{equation}$$$$that, given the matching in Equation (), translates into a bound on the ratio $$\widetilde{m}^2_R/\widetilde{M}^2_\psi$$, $$$$\begin{equation} 0.6 \lesssim \kappa _\umu \lesssim 1.36\quad \Longrightarrow \quad \dfrac{\widetilde{m}^2_R}{\widetilde{M}^2_\psi }\lesssim 0.27\,. \end{equation}$$$$…”