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Updated determination of αs(mτ 2) from τ decays

Rodríguez-Sánchez, Antonio LU and Pich, Antonio (2016) In Modern Physics Letters A 31(30).
Abstract

Using the most recent release of the ALEPH τ decay data, we present a very detailed phenomenological update of the αs(mτ 2) determination. We have exploited the sensitivity to the strong coupling in many different ways, exploring several complementary methodologies. All determinations turn out to be in excellent agreement, allowing us to extract a very reliable value of the strong coupling. We find αs (nf=3)(mτ 2) = 0.328 ± 0.012 which implies αs (nf=5)(MZ 2) = 0.1197 ± 0.0014. We critically revise previous work, and point out the problems flawing some recent analyses which claim slightly smaller values.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
QCD, strong coupling, tau decays
in
Modern Physics Letters A
volume
31
issue
30
article number
1630032
publisher
World Scientific
external identifiers
  • scopus:84988452024
ISSN
0217-7323
DOI
10.1142/S0217732316300329
language
English
LU publication?
no
id
2c468bde-ee21-4db7-8a03-35e98216e472
date added to LUP
2019-05-14 14:01:38
date last changed
2019-11-13 05:32:30
@article{2c468bde-ee21-4db7-8a03-35e98216e472,
  abstract     = {<p>Using the most recent release of the ALEPH τ decay data, we present a very detailed phenomenological update of the α<sub>s</sub>(m<sub>τ</sub> <sup>2</sup>) determination. We have exploited the sensitivity to the strong coupling in many different ways, exploring several complementary methodologies. All determinations turn out to be in excellent agreement, allowing us to extract a very reliable value of the strong coupling. We find α<sub>s</sub> <sup>(nf=3)</sup>(m<sub>τ</sub> <sup>2</sup>) = 0.328 ± 0.012 which implies α<sub>s</sub> <sup>(nf=5)</sup>(M<sub>Z</sub> <sup>2</sup>) = 0.1197 ± 0.0014. We critically revise previous work, and point out the problems flawing some recent analyses which claim slightly smaller values.</p>},
  author       = {Rodríguez-Sánchez, Antonio and Pich, Antonio},
  issn         = {0217-7323},
  language     = {eng},
  month        = {09},
  number       = {30},
  publisher    = {World Scientific},
  series       = {Modern Physics Letters A},
  title        = {Updated determination of α<sub>s</sub>(m<sub>τ</sub> <sup>2</sup>) from τ decays},
  url          = {http://dx.doi.org/10.1142/S0217732316300329},
  doi          = {10.1142/S0217732316300329},
  volume       = {31},
  year         = {2016},
}