Search for γH production and constraints on the Yukawa couplings of light quarks to the Higgs boson

Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Klyukhin, V.; Kodolova, O.; Perfilov, M.; Petrushanko, S.; Savrin, V.; Snigirev, A.; Vorotnikov, G.A.; CMS, C.

Авторы: Boos E., Bunichev V., Dubinin M., Dudko L., Klyukhin V., Kodolova O., Perfilov M., Petrushanko S., Savrin V., Snigirev A., Vorotnikov G.A., CMS Collaboration
Журнал: Physical Review D
Том: 112
Номер: 11
Год издания: 2025
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 112001
DOI: 10.1103/6s8n-pvmy
Аннотация: A search for γH production is performed with data from the CMS experiment at the LHC corresponding to an integrated luminosity of 138 fb−1 at a proton-proton center-of-mass collision energy of 13 TeV. The analysis focuses on the topology of a boosted Higgs boson recoiling against a high-energy photon. The final states of H → bb¯ and H → 4l are analyzed. This study examines effective HZγ and Hγγ anomalous couplings within the context of an effective field theory. In this approach, the production cross section is constrained to be σ_γH < 16.4 fb at 95% confidence level (CL). Simultaneous constraints on four anomalous couplings involving HZγ and Hγγ are provided. Additionally, the production rate for H → 4l is examined to assess potential enhancements in the Yukawa couplings between light quarks and the Higgs boson. Assuming the standard model values for the Yukawa couplings of the bottom and top quarks, the following simultaneous constraints are obtained: κ_u = (0.0 +- 1.5) × 10^3, κ_d = (0.0+6.7−6.8) × 10^2, κ_s = 0+30−32 , and κc = 0.0+2.3−2.8. This rules out the hypothesis that up- or down-type quarks in the first or second generation have the same Yukawa couplings as those in the third generation, with a CL greater than 95%.
Добавил в систему: Клюхин Вячеслав Иванович

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