First lattice QCD calculation of the J/psi to gamma plus axion-like-particle form factor, with under 2% uncertainty, used to update ALP constraints.
Studying Hadronic Structure of the Photon in Lattice QCD
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abstract
We show that the matrix element of a local quark-gluon operator in the photon state, $<\gamma(k\lambda)|\hat O| \gamma(k\lambda)>$, can be calculated in lattice QCD. The result is generalized to other quantities involving space-like photons, including the transition form factor $\gamma\gamma^*\to \pi^0$ and the virtual-photon-nucleon Compton amplitude $<\gamma^*N |\gamma^*N>$ which can be used to define the generalized Drell-Hearn-Gerasimov and Bjorken sum rules.
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Constraints on axion-like particles using lattice QCD calculations of the rate for $J/\psi \to \gamma a$
First lattice QCD calculation of the J/psi to gamma plus axion-like-particle form factor, with under 2% uncertainty, used to update ALP constraints.