A Precise Determination of \(\alpha_s\) From LEP Thrust Data Using Effective Field Theory
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A Precise Determination of \(\alpha_s\) From LEP Thrust Data Using Effective Field Theory
| Title: | A Precise Determination of \(\alpha_s\) From LEP Thrust Data Using Effective Field Theory |
| Author: |
Becher, Thomas; Schwartz, Matthew D
Note: Order does not necessarily reflect citation order of authors. |
| Citation: | Becher, Thomas, and Matthew Schwartz. 2008. A precise determination of \(\alpha_s\) from LEP thrust data using effective field theory. Journal of High Energy Physics 2008(07): 034. |
| Full Text & Related Files: |
0803.0342v2.pdf (696.3Kb; PDF) 
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| Abstract: | Starting from a factorization theorem in Soft-Collinear Effective Theory, the thrust distribution in e\(^+\)e\(^-\) collisions is calculated including resummation of the next-to-next-to-next-to leading logarithms. This is a significant improvement over previous calculations which were only valid to next-to-leading logarithmic order. The fixed-order expansion of the resummed result approaches the exact fixed-order distribution towards the kinematic endpoint. This close agreement provides a verification of both the effective field theory expression and recently completed next-to-next-to-leading fixed order event shapes. The resummed distribution is then matched to fixed order, resulting in a distribution valid over a large range of thrust. A fit to ALEPH and OPAL data from LEP 1 and LEP 2 produces \(\alpha_s(m_Z\))= 0.1172 \(\pm\) 0.0010 \(\pm\) 0.0008 \(\pm\) 0.0012 \(\pm\) 0.0012, where the uncertainties are respectively statistical, systematic, hadronic, and perturbative. This is one of the world's most precise extractions of \(\alpha_s\) to date. |
| Published Version: | doi:10.1088/1126-6708/2008/07/034 |
| Other Sources: | http://arxiv.org/abs/0803.0342v2 |
| Terms of Use: | This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP |
| Citable link to this page: | http://nrs.harvard.edu/urn-3:HUL.InstRepos:7473202 |
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