Lattice QCD and QCD sum rule determination of the decay constants of ηc, J/ψ and hc states

Bečirević, Damir; Duplančić, Goran; Klajn, Bruno; Melić, Blaženka; Sanfilippo, Francesco (2014) Lattice QCD and QCD sum rule determination of the decay constants of ηc, J/ψ and hc states. Nuclear Physics B, 883 . pp. 306-327. ISSN 0550-3213

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Abstract

We compute the decay constants of the lowest View the MathML source-states with quantum numbers JPC=0−+ (ηc), 1−− (J/ψ), and 1+− (hc) by using lattice QCD and QCD sum rules. We consider the coupling of J/ψ 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 ηc→γγ decay, and to comment on the factorization in View the MathML source decays, with View the MathML source being either ηc or J/ψ.

Item Type:	Article
Uncontrolled Keywords:	lattice QCD
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Depositing User:	Goran Duplančić
Date Deposited:	24 Apr 2014 15:49
URI:	http://fulir.irb.hr/id/eprint/1343
DOI:	dx.doi.org/10.1016/j.nuclphysb.2014.03.024

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