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. 306327. ISSN 05503213

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Abstract
We compute the decay constants of the lowest View the MathML sourcestates 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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