Abstract
Experimentally probing the charm-Yukawa coupling in the LHC experiments is important, but very challenging due to an enormous QCD background. We study a new channel that can be used to search for the Higgs decay $H\to c\bar c$, using the vector boson fusion (VBF) mechanism with an associated photon. In addition to suppressing the QCD background, the photon gives an effective trigger handle. We discuss the trigger implications of this final state that can be utilized in ATLAS and CMS. We propose a novel search strategy for $H\to c\bar c$ in association with VBF jets and a photon, where we find a projected sensitivity of about 13 times the SM charm-Yukawa coupling at 95$\%$ $\text{CL}_s$ at High Luminosity LHC (HL-LHC). Our result is comparable and complementary to existing projections at the HL-LHC. We also discuss the implications of increasing the center of mass collision energy to 30 TeV and 100 TeV.
Highlights
Since the discovery of the Higgs boson (H) by the ATLAS [1] and CMS [2] collaborations, determining its properties has become a high priority for the experiments at the LHC
In the Standard Model (SM), fermion mass terms emerge from Higgs boson Yukawa interactions and the Yukawa couplings are proportional to the fermion mass
It is crucial to establish the pattern of the Yukawa couplings to fermions in order to verify the SM and seek hints of Beyond-the-Standard-Model (BSM) physics
Summary
Since the discovery of the Higgs boson (H) by the ATLAS [1] and CMS [2] collaborations, determining its properties has become a high priority for the experiments at the LHC. The LHCb experiment has provided limits using 1.98 fb−1 of data, providing an observed constraint of μ < 6400 [21], with a projection of an upper limit on the μ of 50 after collecting 300 fb−1 of data at 14 TeV assuming no improvements in the detector performance or analysis [22] Another approach does not rely on tagging charm quarks from the Higgs decay, but instead uses the decay of a Higgs boson H → J=ψ þ γ [23,24,25,26,27], a process that has been searched for by ATLAS [28,29] and CMS [30].
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