On Determining αs(mZ) from Dijets in e+e− Thrust

Autor(en)

Miguel Angel Benitez-Rathgeb, André H. Hoang, Vicent Mateu, Iain W. Stewart, Gherardo Vita

Abstrakt

We update a previous N3LL′+(α3s) determination of the strong coupling from a global fit to thrust data by including newly available perturbative ingredients, upgrading the renormalization scales to include a fully canonical scaling region, and implementing the log resummation in a way which ensures the integrated cross section is unaffected by the the leading 1/Q hadronization power corrections. Detailed discussions are provided concerning the stability of the results under variations of the fit range and the importance of summing up higher-order logarithmic terms for convergence and stability. We show that high-precision results can be achieved even when carrying out a more conservative fit by restricting the dataset to a region which is more clearly dominated by dijet events. This leads to αs(mZ)=0.1136±0.0012 with χ2/dof=0.86, fully compatible with earlier results using a larger fit range. We also demonstrate that a number of additional effects associated to power corrections have a small impact on this fit result, including modifications to the renormalon substraction scheme for dijet power corrections and the inclusion of three-jet power correction models. The fit is also shown to provide very good agreement with data outside the fit range.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Universidad de Salamanca, Massachusetts Institute of Technology, European Organization for Nuclear Research (CERN)

DOI

https://doi.org/10.48550/arXiv.2412.15164

Publikationsdatum

12-2024

ÖFOS 2012

103012 Hochenergiephysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2d4aad0d-f3e4-42d1-8009-8ae529b7ac0c