Probing the $H\gamma \gamma$ coupling via Higgs exclusive decay into quarkonia plus a photon at the HL-LHC

Abstract

It is well know that the precise measurement of $H\to \gamma \gamma$ can generate two degenerate parameter spaces of $H\gamma \gamma$ anomalous coupling. We propose to utilize the exclusive Higgs rare decays $H\to {\rm Y}(ns)+\gamma$ to break above mentioned degeneracy and further to constrain the $H\gamma \gamma$ anomalous coupling at the HL-LHC. We demonstrate that the branching ratios of $H\to {\rm Y}(ns)+\gamma$ can be significantly enhanced in the non-SM-like parameter space from $H\to \gamma \gamma$ measurement, due to the destructive interference between the direct and indirect production of ${\rm Y}(ns)$ in the SM. By applying the NRQCD factorization formalism, we calculate the partial decay widths of $H\to {\rm Y}(ns)+\gamma$ at the NLO accuracy of ${\alpha }_s$. We show that it is hopeful to break such degenerate parameter space at the HL-LHC if we can further highly suppress the background and enhance the signal efficiency compared to the ATLAS preliminary simulation.

6 pages, 3 figures, published version

References in corpus (11)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
• An Exclusive Window onto Higgs Yukawa Couplings
• Relativistic corrections to Higgs boson decays to quarkonia
• Jet Charge: A new tool to probe the anomalous $Zb\bar{b}$ couplings at the EIC
• The anomalous $Zb\bar{b}$ couplings at the HERA and EIC
• Constraining wrong-sign $hbb$ couplings with $h\to {\rm Y}\gamma$
• Next-to-leading-order QCD corrections to $e^{+}{e}^{-}\to H+\gamma$
• Probing the $Zb\bar{b}$ anomalous couplings via exclusive $Z$ boson decay
• Next-to-leading order QCD corrections to Higgs boson decay to quarkonium plus a photon

Cited by in corpus (3)

• Rare and exclusive few-body decays of the Higgs, Z, W bosons, and the top quark
• Investigation of the scalar unparticle and anomalous couplings at muon colliders in final states with multiple photons in the Randall- Sundrum model
• Rare few-body decays of the Standard Model Higgs boson