Updated determination of αs from hadronic τ decays

Autor:	Matthias Jamin, Diogo Boito, James Osborne, Maarten Golterman, Andisheh Mahdavi, Kim Maltman, Santiago Peris
Rok vydání:	2013
Předmět:	Physics Nuclear and High Energy Physics Particle physics Nonlinear system Hadron Posterior probability Monte Carlo method Duality (optimization) High Energy Physics::Experiment Model parameters Perturbation theory (quantum mechanics) Atomic and Molecular Physics and Optics Mathematical physics
Zdroj:	Nuclear Physics B - Proceedings Supplements. 234:203-206
ISSN:	0920-5632
DOI:	10.1016/j.nuclphysbps.2012.12.014
Popis:	Recently we introduced a new framework to extract αs from the non-strange hadronic τ-decay spectral functions taking into account duality violations and treating nonperturbative effects self-consistently. Using an updated version of the OPAL 1998 data, we obtain αsFO(mτ2)=0.325±0.018 and αsCl(mτ2)=0.347±0.025 in fixed-order and contour-improved perturbation theory, respectively. The results from our multi-parameter nonlinear fits were corroborated by a Markov-Chain Monte Carlo investigation of the posterior probability distributions of the model parameters.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::448efcfa91279549fb784673eee2d366 https://doi.org/10.1016/j.nuclphysbps.2012.12.014 Zobrazit plný text záznamu Full Text from ScienceDirect