Abstract
We review recent studies of the operator product expansion of the plaquette and of the associated determination of the gluon condensate. One first needs the perturbative expansion to orders high enough to reach the asymptotic regime where the renormalon behavior sets in. The divergent perturbative series is formally regulated using the principal value prescription for its Borel integral. Subtracting the perturbative series truncated at the minimal term, we obtain the leading non-perturbative correction of the operator product expansion, i.e., the gluon condensate, with superasymptotic accuracy. It is then explored how to increase such precision within the context of the hyperasymptotic expansion. The results fully confirm expectations from renormalons and the operator product expansion.
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Notes
We define the \(\beta \)-function as \(\beta (\alpha )=d\alpha /d\ln \mu =-\beta _0/(2\pi )\alpha ^2-\beta _1/(8\pi ^2)\alpha ^3-\cdots \), i.e. \(\beta _0=11\).
In the last equality, we approximate the Wilson coefficients by their perturbative expansions, neglecting the possibility of non-perturbative contributions associated to the hard scale 1/a. These would be suppressed by factors \(\sim \exp (-2\pi /\alpha )\) and, therefore, would be sub-leading relative to the gluon condensate.
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Acknowledgements
I thank C. Ayala, G.S. Bali, C. Bauer, X. Lobregat for collaboration in the work reviewed here. This work was supported in part by the Spanish grants FPA2017-86989-P and SEV-2016-0588 from the ministerio de Ciencia, Innovación y Universidades, and the grant 2017SGR1069 from the Generalitat de Catalunya. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 824093. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya.
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Pineda, A. Theoretical description of the plaquette with exponential accuracy. Eur. Phys. J. Spec. Top. 230, 2601–2608 (2021). https://doi.org/10.1140/epjs/s11734-021-00263-1
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DOI: https://doi.org/10.1140/epjs/s11734-021-00263-1