On Determining αs(mZ) from Dijets in e+e− Thrust
- Author(s)
- Miguel Angel Benitez-Rathgeb, André H. Hoang, Vicent Mateu, Iain W. Stewart, Gherardo Vita
- Abstract
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(s)
- Particle Physics
- External organisation(s)
- Universidad de Salamanca, Massachusetts Institute of Technology, European Organization for Nuclear Research (CERN)
- DOI
- https://doi.org/10.48550/arXiv.2412.15164
- Publication date
- 12-2024
- Austrian Fields of Science 2012
- 103012 High energy physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/2d4aad0d-f3e4-42d1-8009-8ae529b7ac0c