Behavior of the effective QCD coupling α τ(s) at low scales
(2003) In Physical Review D 67(5).- Abstract
The hadronic decays of the τ lepton can be used to determine the effective charge ατ(m τ 2,) for a hypothetical τ lepton with a mass in the range 0<m τ,<mτ. This definition provides a fundamental definition of the QCD coupling at low mass scales. We study the behavior of α τ at low mass scales directly from first principles and without any renormalization-scheme dependence by looking at the experimental data from the OPAL Collaboration. The results are consistent with the freezing of the physical coupling at mass scales s = m τ 2, of order 1 GeV 2 with a magnitude α τ ∼0.9 ±0.1.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5e57a71b-d420-4677-8df9-5d33ecb0efa0
- author
- Brodsky, Stanley J. ; Menke, Sven ; Merino, Carlos and Rathsman, Johan LU
- publishing date
- 2003-12-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review D
- volume
- 67
- issue
- 5
- article number
- 055008
- publisher
- American Physical Society
- external identifiers
-
- scopus:0037368488
- ISSN
- 0556-2821
- DOI
- 10.1103/PhysRevD.67.055008
- language
- English
- LU publication?
- no
- id
- 5e57a71b-d420-4677-8df9-5d33ecb0efa0
- date added to LUP
- 2019-05-14 13:46:35
- date last changed
- 2022-02-23 02:18:57
@article{5e57a71b-d420-4677-8df9-5d33ecb0efa0, abstract = {{<p>The hadronic decays of the τ lepton can be used to determine the effective charge ατ(m <sub>τ</sub> <sup>2</sup>,) for a hypothetical τ lepton with a mass in the range 0<m <sub>τ</sub>,<mτ. This definition provides a fundamental definition of the QCD coupling at low mass scales. We study the behavior of α <sub>τ</sub> at low mass scales directly from first principles and without any renormalization-scheme dependence by looking at the experimental data from the OPAL Collaboration. The results are consistent with the freezing of the physical coupling at mass scales s = m <sub>τ</sub> <sup>2</sup>, of order 1 GeV <sup>2</sup> with a magnitude α <sub>τ</sub> ∼0.9 ±0.1.</p>}}, author = {{Brodsky, Stanley J. and Menke, Sven and Merino, Carlos and Rathsman, Johan}}, issn = {{0556-2821}}, language = {{eng}}, month = {{12}}, number = {{5}}, publisher = {{American Physical Society}}, series = {{Physical Review D}}, title = {{Behavior of the effective QCD coupling α <sub>τ</sub>(s) at low scales}}, url = {{http://dx.doi.org/10.1103/PhysRevD.67.055008}}, doi = {{10.1103/PhysRevD.67.055008}}, volume = {{67}}, year = {{2003}}, }