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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Small-momentum expansion of heavy-quark correlators in the large-beta(0) limit and alpha(s) extractions

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Boito, Diogo [1, 2] ; Mateu, Vicent [3, 4] ; Rodrigues, Marcus V. [1]
Total Authors: 3
[1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Vienna, Fac Phys, Boltzmanngasse 5, A-1090 Vienna - Austria
[3] Univ Salamanca, Dept Fis Fundamental & IUFFyM, E-37008 Salamanca - Spain
[4] UAM CSIC, Inst Fis Teor, E-28049 Madrid - Spain
Total Affiliations: 4
Document type: Journal article
Source: Journal of High Energy Physics; n. 8 AUG 6 2021.
Web of Science Citations: 0

We calculate the small-momentum expansion of vector, axial-vector, scalar, and pseudo-scalar heavy-quark current correlators in the large-beta(0) 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, alpha(s), 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. (AU)

FAPESP's process: 15/20689-9 - Precise determination of fundamental QCD parameters
Grantee:Diogo Rodrigues Boito
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 18/14967-4 - High-precision determination of the charm and bottom quark masses
Grantee:Diogo Rodrigues Boito
Support Opportunities: Regular Research Grants
FAPESP's process: 19/16957-9 - Precise determination of the C quark mass
Grantee:Marcus Vinícius Gonzalez Rodrigues
Support Opportunities: Scholarships in Brazil - Master