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- W2143483224 abstract "The gluon condensate, $$ leftlangle frac{alpha_s}{pi }{G}^2rightrangle $$ , i.e. the leading order power correction in the operator product expansion of current correlators in QCD at short distances, is determined from e+e− annihilation data in the charm-quark region. This determination is based on finite energy QCD sum rules, weighted by a suitable integration kernel to (i) account for potential quark-hadron duality violations, (ii) enhance the contribution of the well known first two narrow resonances, the J/ψ and the ψ(2S), while quenching substantially the data region beyond, and (iii) reinforce the role of the gluon condensate in the sum rules. By using a kernel exhibiting a singularity at the origin, the gluon condensate enters the Cauchy residue at the pole through the low energy QCD expansion of the vector current correlator. These features allow for a reasonably precise determination of the condensate, i.e. $$ leftlangle frac{alpha_s}{pi }{G}^2rightrangle =0.037pm 0.015 $$ GeV4." @default.
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- W2143483224 date "2015-07-01" @default.
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- W2143483224 title "Determination of the gluon condensate from data in the charm-quark region" @default.
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- W2143483224 doi "https://doi.org/10.1007/jhep07(2015)110" @default.
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