Year: 2025
Type: conference-paper
Abstract: We discuss recent progress in radiative decays of heavy quarkonium from $2+1+1$ flavour lattice QCD using the Highly Improved Staggered Quark formalism for all quarks. In particular, we summarise our recent calculations of the decay of heavyonium mesons to on-shell photons. Our calculation of the form factor for the decay $\eta_c\to\gamma\gamma$ and the determination of its decay width has changed the theoretical picture of the process. By calculating the decay width for the process $\eta_b\to\gamma\gamma$ we have provided a robust and timely prediction for experimental searches possible at, for example, Belle II. We then explore Beyond the Standard Model physics by studying $J/\psi\to\gamma a$ where $a$ is an axion-like particle. Our fully relativistic calculation using lattice QCD leads to precise branching fractions and exclusion limits that can now be used in place of nonrelativistic perturbative expansion results that do not fully take nonperturbative effects of hadron decays into account.
DOI: 10.22323/1.483.0120
Authors: Brian Colquhoun, Laurence Cooper, Christine Davies, G. Peter Lepage, Sophie Renner
Institution: University of Glasgow
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
OpenAlex ID: W4415516698
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