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 $t\to hc$ and $t\to hu$ 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 $pp\to tH\to tt\bar{c}$, 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$(t\to hc{)}_{\text{SM}}=(4.19_{-0.80}^{+1.08}\pm 0.16)\times 10^{-15}$ and BR$(t\to hu{)}_{\text{SM}}=(3.66_{-0.70}^{+0.94}\pm 0.67)\times 10^{-17}$ with the main uncertainties coming from higher order QCD and CKM matrix elements.

27 pages, 3 Tables, 5 Figures

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• Flavor Changing Neutral Currents in the Higgs Sector
• A Final Word on FCNC-Baryogenesis from Two Higgs Doublets
• The Charged Higgs from the Bottom-Up: Probing Flavor at the LHC
• Rare top-quark decays $t\to cg(g)$ in the aligned two-Higgs-doublet model
• Prospect and implications of $cg\to b{H}^{+}\to bA{W}^{+}$ production at the LHC