Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 7, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP07(2022)016
Keywords
Higher-Order Perturbative Calculations; Specific QCD Phenomenology
Categories
Funding
- FWF Austrian Science Fund [W1252-N27, P32383-N27]
- Erwin-Schrodinger International Institute for Mathematics and Physics
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- Sao Paulo Research Foundation (FAPESP) [2021/06756-6]
- Austrian Science Fund (FWF) [P32383] Funding Source: Austrian Science Fund (FWF)
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We propose a simple and easy-to-implement scheme for a renormalon-free gluon condensate (GC) matrix element, which can be used for any observable where the GC is relevant. We show that the scheme is capable of resolving the discrepancy problem and improving the perturbative behavior of moments used in high-precision determinations of the strong coupling.
We propose a simple and easy-to-implement scheme for a renormalon-free gluon condensate (GC) matrix element, which is analogous to implementations of short-distance heavy-quark mass renormalization schemes existing in the literature already for a long time. Because the scheme is based on a perturbative subtraction at the level of the matrix element, with a freely adaptable infrared factorization scale, it can be implemented with little effort for any observable where the GC is relevant. The scheme depends on the renormalon norm of the GC which has to be supplemented independently. We apply the scheme to the fixed-order (FOPT) and contour-improved (CIPT) perturbative expansions of tau hadronic spectral function moments. These expansions exhibit a long-standing discrepancy for moments used in high-precision determinations of the strong coupling in the commonly used GC scheme that is not renormalon-free. We show that the scheme is capable of resolving the FOPT-CIPT discrepancy problem. At the same time, the perturbative behaviour of the moments that previously showed bad convergence properties and for which the non-perturbative corrections from the GC are sizeable, is substantially improved. The new GC scheme may provide a powerful theoretical tool for future phenomenological applications.
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