On the use of the operator product expansion in finite-energy sum rules for light-quark correlators

Boito, Diogo; Golterman, Maarten; Maltman, Kim; Peris, Santiago

doi:10.21468/SciPostPhysProc.16.006

SciPost Physics Proceedings

On the use of the operator product expansion in finite-energy sum rules for light-quark correlators

Diogo Boito, Maarten Golterman, Kim Maltman, Santiago Peris

SciPost Phys. Proc. 16, 006 (2025) · published 14 July 2025

doi: 10.21468/SciPostPhysProc.16.006
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16th International Workshop on Tau Lepton Physics

Abstract

Tau-based finite-energy sum-rule (FESR) analyses often assume that scales $s_0\sim m_\tau^2$ are large enough that (i) integrated duality violations (DVs) can be neglected, and (ii) contributions from non-perturbative OPE condensates of dimension $D$ scale as $(\Lambda_{QCD}/m_\tau )^D$, allowing the OPE series to be truncated at low dimension. The latter assumption is not necessarily valid since the OPE series is not convergent, while the former is open to question given experimental results for the electromagnetic, $I=1$ vector ($V$), $I=1$ axial vector ($A$) and $I=1$ $V+A$ current spectral functions, which show DV oscillations with amplitudes comparable in size to the corresponding $\alpha_s$-dependent perturbative contributions at $s\sim2-3$ GeV$^2$. Here, we discuss recently introduced new tools for assessing the numerical relevance of omitted higher-$D$ OPE contributions. Applying these to the "truncated OPE" strategy used in Refs. [M. Davier et al., Eur. Phys. J. C 74, 2803 (2014); A. Pich and A. Rodríguez-Sánchez, Phys. Rev. D 94, 034027 (2016)] and earlier work by the same authors, we find that this strategy fails to yield reliable results for the strong coupling from hadronic $\tau$ decays.

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.16.006
TI  - On the use of the operator product expansion in finite-energy sum rules for light-quark correlators
PY  - 2025/07/14
UR  - https://scipost.org/SciPostPhysProc.16.006
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 16
SP  - 006
A1  - Boito, Diogo
AU  - Golterman, Maarten
AU  - Maltman, Kim
AU  - Peris, Santiago
AB  - Tau-based finite-energy sum-rule (FESR) analyses often assume that scales $s_0\sim m_\tau^2$ are large enough that (i) integrated duality violations (DVs) can be neglected, and (ii) contributions from non-perturbative OPE condensates of dimension $D$ scale as $(\Lambda_{QCD}/m_\tau )^D$, allowing the OPE series to be truncated at low dimension. The latter assumption is not necessarily valid since the OPE series is not convergent, while the former is open to question given experimental results for the electromagnetic, $I=1$ vector ($V$), $I=1$ axial vector ($A$) and $I=1$ $V+A$ current spectral functions, which show DV oscillations with amplitudes comparable in size to the corresponding $\alpha_s$-dependent perturbative contributions at $s\sim2-3$ GeV$^2$. Here, we discuss recently introduced new tools for assessing the numerical relevance of omitted higher-$D$ OPE contributions. Applying these to the "truncated OPE" strategy used in Refs. [M. Davier et al., Eur. Phys. J. C 74, 2803 (2014); A. Pich and A. Rodríguez-Sánchez, Phys. Rev. D 94, 034027 (2016)] and earlier work by the same authors, we find that this strategy fails to yield reliable results for the strong coupling from hadronic $\tau$ decays.
ER  -

@Article{10.21468/SciPostPhysProc.16.006,
	title={{On the use of the operator product expansion in finite-energy sum rules for light-quark correlators}},
	author={Diogo Boito and Maarten Golterman and Kim Maltman and Santiago Peris},
	journal={SciPost Phys. Proc.},
	pages={006},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.16.006},
	url={https://scipost.org/10.21468/SciPostPhysProc.16.006},
}

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