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Lattice QCD estimate of the η c (2S) → J/ψγ decay rate
We compute the hadronic matrix element relevant to the physical radiative decay η c (2S) → J/ψγ by means of lattice QCD. We use the (maximally) twisted mass QCD action with N f = 2 light dynamical quarks and from the computations made at four lattice spacings we were able …