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Lattice QCD study of the $\chi_{c1}\to J/\psi \, \gamma$ decay
D. Be\v{c}irevi\'c, R. Di Palma, R. Frezzotti, G. Gagliardi, V. Lubicz, F. Sanfilippo, N. Tantalo
https://arxiv.org/abs/2506.17030

Lattice QCD study of the $χ_{c1}\to J/ψ\, γ$ decay
We present the results of our lattice QCD computation of the electric ($E_{1}$) and magnetic $(M_{2})$ form factors relevant to the $χ_{c1}\to J/ψ\,γ$ decay by using the gauge field configurations produced by the Extended Twisted Mass Collaboration with $N_{f}=2+1+1$ dynamical Wilson-Clover twisted mass fermions at four different lattice spacings with physical dynamical $u$ , $d$, $s$ and $c$ quark masses (except for the coarsest lattice for which the lightest sea quark corresponds to a pion…

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