A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H -> c (c) over bar, produced in association with a top quark-antiquark pair (t (t) over barH) is presented. The search is performed with data from proton-proton collisions at root s = 13 TeV, corresponding to an integrated luminosity of 138 fb(-1). Advanced machine learning techniques are employed for jet flavor identification and event classification. The Higgs boson decay to a bottom quark-antiquark pair is measured simultaneously and the observed t (t) over barH(H -> b (b) over bar) event rate relative to the standard model expectation is 0.91(+0.26)(-0.22). The observed (expected) upper limit on the product of production cross section and branching fraction sigma(t (t) over barH) B(H -> c (c) over bar) is 0.11 (0.13) pb at 95% confidence level, corresponding to 7.8 (8.7) times the standard model prediction. When combined with the previous search for H -> c (c) over bar via associated production with a W or Z boson, the observed (expected) 95% confidence interval on the Higgs-charm Yukawa coupling modifier, kappa(c), is vertical bar kappa(c)vertical bar < 3.5 (2.7), the most stringent constraint to date.

Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Andrejkovic, J.W., Benato, L., et al. (2026). Simultaneous Probe of the Charm and Bottom Quark Yukawa Couplings Using t(t)over-barH Events. PHYSICAL REVIEW LETTERS, 136(1) [10.1103/9nwb-splk].

Simultaneous Probe of the Charm and Bottom Quark Yukawa Couplings Using t(t)over-barH Events

Ciocci, M. A.;Turini, N.;
2026-01-01

Abstract

A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, H -> c (c) over bar, produced in association with a top quark-antiquark pair (t (t) over barH) is presented. The search is performed with data from proton-proton collisions at root s = 13 TeV, corresponding to an integrated luminosity of 138 fb(-1). Advanced machine learning techniques are employed for jet flavor identification and event classification. The Higgs boson decay to a bottom quark-antiquark pair is measured simultaneously and the observed t (t) over barH(H -> b (b) over bar) event rate relative to the standard model expectation is 0.91(+0.26)(-0.22). The observed (expected) upper limit on the product of production cross section and branching fraction sigma(t (t) over barH) B(H -> c (c) over bar) is 0.11 (0.13) pb at 95% confidence level, corresponding to 7.8 (8.7) times the standard model prediction. When combined with the previous search for H -> c (c) over bar via associated production with a W or Z boson, the observed (expected) 95% confidence interval on the Higgs-charm Yukawa coupling modifier, kappa(c), is vertical bar kappa(c)vertical bar < 3.5 (2.7), the most stringent constraint to date.
2026
Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Andrejkovic, J.W., Benato, L., et al. (2026). Simultaneous Probe of the Charm and Bottom Quark Yukawa Couplings Using t(t)over-barH Events. PHYSICAL REVIEW LETTERS, 136(1) [10.1103/9nwb-splk].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1324435