Flavor Changing Heavy Higgs Interactions at the LHC

Abstract

A general two Higgs doublet model (2HDM) is adopted to study the signature of flavor changing neutral Higgs (FCNH) decay ${\varphi }^0\to t\bar{c}+\bar{t}c$, where ${\varphi }^0$ could be a CP-even scalar ($H^0$) or a CP-odd pseudoscalar ($A^0$). Measurement of the light 125 GeV neutral Higgs boson ($h^0$) couplings at the Large Hadron Collider (LHC) favor the decoupling limit or the alignment limit of a 2HDM, in which gauge boson and diagonal fermion couplings of $h^0$ approach Standard Model values. In such limit, FCNH couplings of $h^0$ are naturally suppressed by a small mixing parameter $\cos (\beta -\alpha )$, while the off-diagonal couplings of heavier neutral scalars ${\varphi }^0$ are sustained by $\sin (\beta -\alpha )\sim 1$. We study physics background from dominant processes with realistic acceptance cuts and tagging efficiencies. Promising results are found for the LHC running at 13 or 14 TeV collision energies.

arXiv comment14 pages, 5 figures, to be published in Phys. Lett. B

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