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Small-momentum expansion of heavy-quark correlators in the large-β0 limit and αs extractions
- Source :
- Journal of High Energy Physics, Journal of High Energy Physics, Vol 2021, Iss 8, Pp 1-28 (2021)
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- 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.<br />Comment: 27 pages, 7 figures. References added. Version to appear in JHEP
- Subjects :
- Quark
Quantum chromodynamics
Physics
Nuclear and High Energy Physics
Particle physics
High Energy Physics::Lattice
Computer Science::Information Retrieval
High Energy Physics::Phenomenology
Scalar (mathematics)
QC770-798
QCD Phenomenology
Quarkonium
Renormalon
Momentum
High Energy Physics - Phenomenology
Lattice (module)
High Energy Physics - Lattice
NLO Computations
Nuclear and particle physics. Atomic energy. Radioactivity
Limit (mathematics)
Subjects
Details
- ISSN :
- 10298479
- Volume :
- 2021
- Database :
- OpenAIRE
- Journal :
- Journal of High Energy Physics
- Accession number :
- edsair.doi.dedup.....33bba34589bba6a933d88afbab6b8474