Charm-quark mass effects in NRQCD matching coefficients and the leptonic decay of the ϒ(1S) meson

Autor:	K. Schönwald, Matthias Steinhauser, Manuel Egner, Matteo Fael, Jan Piclum
Rok vydání:	2021
Předmět:	Quark Physics Particle physics Muon Current (mathematics) Meson High Energy Physics::Phenomenology Order (ring theory) High Energy Physics::Experiment Electron Perturbation theory Charm quark
Zdroj:	Physical Review
ISSN:	2470-0029 2470-0010
Popis:	We compute two-loop corrections to the vector current matching coefficient involving two heavy quark masses. The result is applied to the computation of the ϒ(1S) decay width into an electron or muon pair. We complement the next-to-next-to-next-to-leading order corrections of M. Beneke, et al. [Phys. Rev. Lett. 112, 151801 (2014)] by charm quark mass effects up to second order in perturbation theory. Furthermore, we apply the formalism to Γ(J/Ψ→ℓ+ℓ−) and compare to the experimental data.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abad00b3fc2e5d04978b3cde32411709 https://doi.org/10.1103/physrevd.104.054033 Zobrazit plný text záznamu