Proton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (t) and Higgs bosons (H). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb(-1.) No significant excess above the background prediction is observed. Upper limits on the branching fractions (B) of the top quark decaying to a Higgs boson and an up (u) or charm (c) quark are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019% (0.031%) for B(t -> Hu) and 0.073% (0.051%) for B(t -> Hc). These are the strictest upper limits yet determined.

Search for Flavor-Changing Neutral Current Interactions of the Top Quark and Higgs Boson in Final States with Two Photons in Proton-Proton Collisions at sqrt[s]=13  TeV / Tumasyan, A; Adam, W; Andrejkovic, J W; Bergauer, T; Chatterjee, S; Dragicevic, M; Escalante Del Valle, A; Frühwirth, R; Jeitler, M; Krammer, N; Lechner, L; Liko, D; Mikulec, I; Paulitsch, P; Pitters, F M; Schieck, J; Schöfbeck, R; Schwarz, D; Templ, S; Waltenberger, W; Wulz, C-E; Chekhovsky, V; Litomin, A; Makarenko, V; Darwish, M R; De Wolf, E A; Janssen, T; Kello, T; Lelek, A; Rejeb Sfar, H; Van Mechelen, P; Van Putte, S; Van Remortel, N; Blekman, F; Bols, E S; D'Hondt, J; Delcourt, M; El Faham, H; Lowette, S; Moortgat, S; Morton, A; Müller, D; Sahasransu, A R; Tavernier, S; Van Doninck, W; Van Mulders, P; Beghin, D; Bilin, B; Clerbaux, B; De Lentdecker, G; Favart, L; Grebenyuk, A; Kalsi, A K; Lee, K; Mahdavikhorrami, M; Makarenko, I; Moureaux, L; Pétré, L; Popov, A; Postiau, N; Starling, E; Thomas, L; Vanden Bemden, M; 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[10.1103/PhysRevLett.129.032001]

Search for Flavor-Changing Neutral Current Interactions of the Top Quark and Higgs Boson in Final States with Two Photons in Proton-Proton Collisions at sqrt[s]=13  TeV

Ceccarelli, R;Ciulli, V;D'Alessandro, R;Focardi, E;Latino, G;Lenzi, P;Lizzo, M;Seidita, R;
2022

Abstract

Proton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (t) and Higgs bosons (H). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb(-1.) No significant excess above the background prediction is observed. Upper limits on the branching fractions (B) of the top quark decaying to a Higgs boson and an up (u) or charm (c) quark are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019% (0.031%) for B(t -> Hu) and 0.073% (0.051%) for B(t -> Hc). These are the strictest upper limits yet determined.