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

(CMS Collaboration) Chekhovsky, Vladimir ; ... ; Giljanović, Duje ; Godinović, Nikola ; Lelas, Damir ; Šćulac, Ana ; Kovač, Marko ; Petković, Andro ; Šćulac, Toni ; Bargassa, Pedrame ; Brigljević, Vuko ; Chitroda, Bhakti Kanulal ; Ferenček, Dinko ; Jakovčić, Krešimir ; Starodumov, Andrey ; Šuša, Tatjana ; ... ; Mishra, Saswat ; ... ; Roguljić, Matej ; ... ; Druzhkin, Dmitry (2025) Search for γH production and constraints on the Yukawa couplings of light quarks to the Higgs boson. Physical Review D - Particles, Fields, Gravitation and Cosmology, 112 (11). ISSN 2470-0010

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Abstract

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 σγH < 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: κu = (0.0 ± 1.5) × 103 , κd = (0.0+6.7 −6.8) × 102 , κs = 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%.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Centre for detectors, sensors and electronics Division of Experimental Physics
Depositing User:	Kristina Ciglar
Date Deposited:	22 Jan 2026 13:08
URI:	http://fulir.irb.hr/id/eprint/11058
DOI:	10.1103/6s8n-pvmy

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