CMS-PAS-HIG-23-011

CMS-PAS-HIG-23-011
Search for $\gamma$ H production in pp collisions at $\sqrt{s} =$ 13 TeV and constraintson the Yukawa couplings of light quarks to the Higgs boson using data from the CMS detector
CMS Collaboration
24 September 2024

Abstract: A search for $\gamma$ H production is performed with the 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 $\to{\text b}\bar{\text b}$ and 4 $\ell$ are analyzed. This study examines effective HZ $\gamma$ and H $\gamma\gamma$ anomalous couplings within the context of Effective Field Theory. In this approach, the production cross section for $\gamma$ H is constrained to be $\sigma_{\gamma\mathrm{H}} <$ 15.7 fb at 95% CL. Additionally, simultaneous constraints on four anomalous couplings involving HZ $\gamma$ and H $\gamma\gamma$ are provided. The production rate for H $\to4\ell$ is also examined to assess potential enhancements in the Yukawa couplings between light quarks and the Higgs boson. Assuming the standard model Yukawa couplings for the bottom and top quarks, the following simultaneous constraints are obtained: $\kappa_\mathrm{u}=$ (0.0 $\pm$ 1.5 ) $\times$ 10 $^{3}$ , $\kappa_\mathrm{d}=$ (0.0 $\pm$ 7.1) $\times$ 10 $^{2}$ , $\kappa_\mathrm{s}=$ 0 $^{+33}_{-34}$ , and $\kappa_\mathrm{c}=$ 0.0 $^{+2.7}_{-3.0}$ , ruling out the hypothesis that up-type and 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%.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRD. The superseded preliminary plots can be found here.

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