Rare top decays as probes of flavorful Higgs bosons

Abstract

We study a version of Two Higgs Doublet Models with non-standard flavor violation in the up quark sector. We find branching ratios for the rare top decays t → hc and t → hu that are within reach of current and future colliders, while other flavor constraints from rare B decays and neutral D meson mixing, as well as constraints from Higgs signal strength measurements remain under control. The most prominent collider signature of the considered setup is pp → tH → ttc, providing continued motivation to search for same-sign tops at the LHC as well as a simple framework to interpret these searches. As a byproduct of our study, we provide updated SM predictions for the rare top decays BR(t → hc) SM = (4.19 +1.08 −0.80 ± 0.16) × 10 −15 and BR(t → hu) SM = (3.66 +0.94 −0.70 ± 0.67) × 10 −17 with the main uncertainties coming from higher order QCD and CKM matrix elements. *

Probes of the Standard Model effective field theory extended with a right-handed neutrino

“…Similar expressions hold of course for second generation quarks. The sensitivity of measurements at colliders is expected to be similar in both cases, just as in other flavourviolating top decays [33][34][35][36][37][38].…”

Explaining (g − 2)μ with multi-TeV sleptons

“…There are several possible future directions to further explore the FSSM. The rank-1 ansatz for the Yukawa couplings has been successfully implemented in the quark sector in non-supersymmetric versions of the model [5,11,[112][113][114]. It has been shown that in the considered scenarios quark flavor changing neutral currents can be relatively easily in agreement with experimental bounds.…”

Explaining $(g-2)_μ$ with Multi-TeV Sleptons

“…There are several possible future directions to further explore the FSSM. The rank-1 ansatz for the Yukawa couplings has been successfully implemented in the quark sector in non-supersymmetric versions of the model [5,11,[70][71][72]. It has been shown that in the considered scenarios quark flavor changing neutral currents can be relatively easily in agreement with experimental bounds.…”