Precise determination of αs from the C-parameter distribution
- Author(s)
- Andre H. Hoang, Daniel W. Kolodrubetz, Vicent Mateu, Iain W. Stewart
- Abstract
We present a global fit for αs(mZ), analyzing the available C-parameter data measured at center-of-mass energies between Q=35 and 207 GeV. The experimental data is compared to a N3LL'+O(αs3)+Ω1 theoretical prediction (up to the missing four-loop cusp anomalous dimension), which includes power corrections coming from a field-theoretical nonperturbative soft function. The dominant hadronic parameter is its first moment Ω1, which is defined in a scheme which eliminates the O(ΛQCD) renormalon ambiguity. The resummation region plays a dominant role in the C-parameter spectrum, and in this region a fit for αs(mZ) and Ω1 is sufficient. We find αs(mZ)=0.1123±0.0015 and Ω1=0.421±0.063 GeV with χ2/d.o.f.=0.988 for 404 bins of data. These results agree with the prediction of universality for Ω1 between thrust and C-parameter within 1-σ.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Massachusetts Institute of Technology
- Journal
- Physical Review D
- Volume
- 91
- No. of pages
- 24
- ISSN
- 1550-7998
- Publication date
- 05-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- Keywords
- ASJC Scopus subject areas
- Nuclear and High Energy Physics, Physics and Astronomy (miscellaneous)
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/precise-determination-of-s-from-the-cparameter-distribution(560acb2c-bf3a-4b6d-a46f-4cc5d6395a23).html