Search for Flavor Changing Neutral Currents in $t\to Hc,H\to \tau \tau$ Decay at the LHC

Abstract

The prospects of searching for the flavor changing neutral current effect in the decay of $t\to Hc,H\to \tau \tau$ are investigated with the simulated $p-p$ collision data for the ATLAS detector at the LHC, where the Higgs mass is assumed to be 125~GeV. A fit based on the constraints from the Higgs mass and the tau decay kinematics is performed for each event, which improves significantly the Higgs and top mass reconstruction and helps the signal-background separation. Boosted Decision Trees discriminants are developed to achieve an optimal sensitivity of searching for the FCNC signal. An expected upper limit of the branching ratio $\mathcal{B}(t\to Hc)$ at $95\%$ confidence level of 0.25\% is obtained with a data set of 100~fb${}^{-1}$ at $\sqrt{s}=13$ TeV during the LHC Run-2 period.

revised, references added, accepted for publication in Physical Review D

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Cited by in corpus (5)

• Search for top-quark decays $t\to Hq$ with 36 fb${}^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV with the ATLAS detector
• Probing the top-Higgs boson FCNC couplings via the $h\to \gamma \gamma$ channel at the HE-LHC and FCC-hh
• Flavor changing top decays to charm and Higgs with $\tau \tau$ at the LHC
• Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of $\tau$-leptons in pp collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Probing anomalous top-Higgs couplings at the HL-LHC via $H\to W{W}^{\ast }$ decay channels