Direct and indirect constraints on CP-violating Higgs-quark and Higgs-gluon interactions

Abstract

Abstract:We investigate direct and indirect constraints on the complete set of anomalous CP-violating Higgs couplings to quarks and gluons originating from dimension-6 operators, by studying their signatures at the LHC and in electric dipole moments (EDMs). We show that existing uncertainties in hadronic and nuclear matrix elements have a significant impact on the interpretation of EDM experiments, and we quantify the improvements needed to fully exploit the power of EDM searches. Currently, the best bounds on the anomalous CP-violating Higgs interactions come from a combination of EDM measurements and the data from LHC Run 1. We argue that Higgs production cross section and branching ratios measurements at the LHC Run 2 will not improve the constraints significantly. On the other hand, the bounds on the couplings scale roughly linearly with EDM limits, so that future theoretical and experimental EDM developments can have a major impact in pinning down interactions of the Higgs.

Modeling BSM effects on the Higgs transverse-momentum spectrum in an EFT approach

“…The contribution of the chromomagnetic operator to the function F (τ ) has been addressed in the literature with contradicting results [116,117] (see also ref. [118]). In ref.…”

Is there room forCPviolation in the top-Higgs sector?

“…Despite the vast literature on top-gluon [5][6][7][8][9][10][11][12][13][14][15][16], top-photon [17][18][19][20][21], top-W [22][23][24][25][26][27][28], top Yukawa [29][30][31][32][33][34][35][36] couplings, and global analyses [37][38][39][40][41][42], the impact of electric dipole moments (EDMs) has received comparatively little attention [17,29,37,43,44]. The central new element of our work is the systematic inclusion of EDM constraints.…”

“…The central new element of our work is the systematic inclusion of EDM constraints. Even after properly taking into account the hadronic and nuclear uncertainties [44], EDMs dominate the bounds on all the CPV top couplings. Our major finding is that bounds on the top EDM (weak EDM) are improved by three (two) orders of magnitude over the previous literature.…”

“…The strongest constraints arise again from the two-step path: C W t → C ϕW ,ϕB,ϕW B,lequ,quqd → C The gluonic dipole coupling C g mixes at one loop with the top electromagnetic dipole C γ , the non-standard Yukawa C Y , and non-standard Higgs-gluon couplings C ϕG,ϕG [44,49,65,69,70]. Moreover, C g generates the light chromo-EDMs through the two-step mechanism, C g → C (1), (8) quqd → C (q) g , and induces OG at the top threshold.…”

High- and low-energy constraints on top-Higgs couplings

“…Here we will employ the EDM measurements of the neutron, ThO, and mercury [34][35][36]. We briefly comment on the impact of theory errors in section 6, see [14,37] for details. To generate d n , d ThO and d Hg one first has to induce the operators in Eq.…”