Small-momentum expansion of heavy-quark correlators in the large-ß0 limit and as extractions. BOITO, Diogo Rodrigues; MATEU, Vicent; RODRIGUES, Marcus Vinícius Gonzalez.
Abstract: We calculate the small-momentum expansion of vector, axial-vector, scalar, and pseudo-scalar heavy-quark current correlators in the large-ß0 limit of QCD, extending the analysis of Grozin and Sturm beyond the vector current. Our results are used to study the higher-order behaviour of dimensionless ratios of vector and pseudo-scalar moments used for the precise extraction of the strong coupling, as, from relativistic quarkonium sum rules and lattice data, respectively. We show that these ratios benefit from a partial cancellation of the leading renormalon singularities. Our results can guide the design of combinations of moments with improved perturbative behaviour.
Journal of High Energy Physics
v. 2021, n. 8, p. 027-1-027-27 - Ano: 2021
Fator de Impacto: 5,810
@article={003039481,author = {BOITO, Diogo Rodrigues; MATEU, Vicent; RODRIGUES, Marcus Vinícius Gonzalez.},title={Small-momentum expansion of heavy-quark correlators in the large-ß0 limit and as extractions},journal={Journal of High Energy Physics},note={v. 2021, n. 8, p. 027-1-027-27},year={2021}}
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Abstract: We calculate the small-momentum expansion of vector, axial-vector, scalar, and pseudo-scalar heavy-quark current correlators in the large-ß0 limit of QCD, extending the analysis of Grozin and Sturm beyond the vector current. Our results are used to study the higher-order behaviour of dimensionless ratios of vector and pseudo-scalar moments used for the precise extraction of the strong coupling, as, from relativistic quarkonium sum rules and lattice data, respectively. We show that these ratios benefit from a partial cancellation of the leading renormalon singularities. Our results can guide the design of combinations of moments with improved perturbative behaviour.
@article={003039481,author = {BOITO, Diogo Rodrigues; MATEU, Vicent; RODRIGUES, Marcus Vinícius Gonzalez.},title={Small-momentum expansion of heavy-quark correlators in the large-ß0 limit and as extractions},journal={Journal of High Energy Physics},note={v. 2021, n. 8, p. 027-1-027-27},year={2021}}