Updated determination of α<inf>s</inf> from hadronic τ decays

Diogo Boito; Maarten Golterman; Matthias Jamin; Andisheh Mahdavi; Kim Maltman; James Osborne; Santiago Peris

doi:10.1016/j.nuclphysbps.2012.12.014

Updated determination of α<inf>s</inf> from hadronic τ decays

Diogo Boito, Maarten Golterman, Matthias Jamin, Andisheh Mahdavi, Kim Maltman, James Osborne, Santiago Peris

Department of Physics

Research output: Contribution to journal › Article › Research › peer-review

1 Citation (Scopus)

Abstract

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. © 2013 Elsevier B.V.

Original language	English
Pages (from-to)	203-206
Journal	Nuclear Physics B - Proceedings Supplements
Volume	234
DOIs	https://doi.org/10.1016/j.nuclphysbps.2012.12.014
Publication status	Published - 1 Jan 2013

Keywords

α s
Duality violations
Tau decay

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title = "Updated determination of αs from hadronic τ decays",

abstract = "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. {\textcopyright} 2013 Elsevier B.V.",

keywords = "α s, Duality violations, Tau decay",

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T1 - Updated determination of αs from hadronic τ decays

AU - Boito, Diogo

AU - Golterman, Maarten

AU - Jamin, Matthias

AU - Mahdavi, Andisheh

AU - Maltman, Kim

AU - Osborne, James

AU - Peris, Santiago

PY - 2013/1/1

Y1 - 2013/1/1

N2 - 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. © 2013 Elsevier B.V.

AB - 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. © 2013 Elsevier B.V.

KW - α s

KW - Duality violations

KW - Tau decay

U2 - 10.1016/j.nuclphysbps.2012.12.014

DO - 10.1016/j.nuclphysbps.2012.12.014

M3 - Article

VL - 234

SP - 203

EP - 206

ER -