State-of-the-Art Predictions for C-parameter and a Determination of α <sub>s</sub>
- Autor(en)
- Andre H. Hoang, Daniel W. Kolodrubetz, Vicent Mateu Barreda, Iain W. Stewart
- Abstrakt
The C-parameter event-shape distribution for e
+e
- annihilation into hadrons is computed in the framework of SCET including input from fixed-order perturbation theory. We calculate all missing ingredients for achieving N
3LL resummation accuracy in the cross section, which is then matched onto O(α
s
3) fixed-order results. Hadronization power corrections are incorporated as a convolution with a nonperturbative shape function. Wide-angle soft radiation effects introduce an O(Λ
QCD) renormalon ambiguity in the cross section, which we cure by switching to the Rgap short-distance scheme. We also include hadron mass effects, but find their effect is rather small. Performing fits to the tail of the C-parameter distribution for many center of mass energies we find that the strong coupling constant is α
s(m
Z)=0.1121±0.0015, with χ
2/dof=0.99.
- Organisation(en)
- Teilchenphysik, Forschungsplattform Internationales Erwin Schrödinger Institut für Mathematik und Physik
- Externe Organisation(en)
- Massachusetts Institute of Technology
- Journal
- Nuclear and Particle Physics Proceedings
- Band
- 273-275
- Seiten
- 2015-2021
- Anzahl der Seiten
- 7
- ISSN
- 2405-6014
- DOI
- https://doi.org/10.1016/j.nuclphysbps.2015.09.326
- Publikationsdatum
- 2016
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103012 Hochenergiephysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Nuclear and High Energy Physics
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/stateoftheart-predictions-for-cparameter-and-a-determination-of--s(555d4cc1-0e5c-4376-98a2-b894435ee653).html