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arxiv: 1312.2858 · v3 · pith:DSZYJ4IRnew · submitted 2013-12-10 · ✦ hep-ph · hep-ex· hep-lat

Lattice QCD and QCD Sum Rule determination of the decay constants of eta_c, J/psi and hc states

Damir Becirevic , Goran Duplancic , Bruno Klajn , Blazenka Melic , Francesco Sanfilippo This is my paper
classification ✦ hep-ph hep-exhep-lat
keywords latticedecayconstantsgammaresultsrulerulesallowing
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We compute the decay constants of the lowest ccbar-states with quantum numbers J(PC)=0(-+) [eta_c], 1(--) [J/psi], and 1(+-) [hc] by using lattice QCD and QCD sum rules. We consider the coupling of J/psi to both the vector and tensor currents. Lattice QCD results are obtained from the unquenched (Nf=2) simulations using twisted mass QCD at four lattice spacings, allowing us to take the continuum limit. On the QCD sum rule side we use the moment sum rules. The results are then used to discuss the rate of eta_c --> gamma gamma decay, and to comment on the factorization in B --> X K decays, with X being either eta_c or J/psi.

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