Probing Higgs Width and Top Quark Yukawa Coupling from $t\bar{t}H$ and $t\bar{t}t\bar{t}$ Productions

Abstract

We demonstrate that four top-quark production is a powerful tool to constrain the top Yukawa coupling. The constraint is robust in the sense that it does not rely on the Higgs boson decay. Taking into account the projection of the $t\bar{t}H$ production by the ATLAS collaobration, we obtain a bound on Higgs boson width, ${\Gamma }_H\le 3.1{\Gamma }_H^{\mathrm{SM}}$, at the 14 TeV LHC with an integrated luminosity of $300{\mathrm{fb}}^{-1}$. Increasing the luminosity to $500{\mathrm{fb}}^{-1}$ yields ${\Gamma }_H\le 2.1{\Gamma }_H^{\mathrm{SM}}$.

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Cited by in corpus (30)

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• Constraining $qqtt$ operators from four-top production: a case for enhanced EFT sensitivity
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• Resolving the degeneracy in top quark Yukawa coupling with Higgs pair production
• Search for standard model production of four top quarks in proton-proton collisions at sqrt(s) = 13 TeV
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