Measuring rare and exclusive Higgs boson decays into light resonances

Abstract

We evaluate the LHC's potential of observing Higgs boson decays into light elementary or composite resonances through their hadronic decay channels. We focus on the Higgs boson production processes with the largest cross sections, $pp\to h$ and $pp\to h+\mathrm{jet}$, with subsequent decays $h\to ZA$ or $h\to Z{\eta }_c$, and comment on the production process $pp\to hZ$. By exploiting track-based jet substructure observables and extrapolating to $3000{\mathrm{fb}}^{-1}$ we find $\mathcal{B}\mathcal{R}(h\to ZA)\simeq \mathcal{B}\mathcal{R}(h\to Z{\eta }_c)\lesssim 0.02$ at 95% CL. We interpret this limit in terms of the 2HDM Type 1. We find that searches for $h\to ZA$ are complementary to existing measurements and can constrain large parts of the currently allowed parameter space.

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Cited by in corpus (6)

• Search for Higgs boson decays into a $Z$ boson and a light hadronically decaying resonance using 13 TeV $pp$ collision data from the ATLAS detector
• Thrust distribution in Higgs decays at the next-to-leading order and beyond
• Double-charming Higgs identification using machine-learning assisted jet shapes
• Seeking the CP-odd Higgs via $h\to {\eta }_{c,b}{\ell }^{+}{\ell }^{-}$
• Angularity in Higgs boson decays via $\mathbf{H}\to \mathbf{gg}$ at NNLL${}^{\prime }$ accuracy
• Probing light-quark Yukawa couplings via hadronic event shapes at lepton colliders