2024/12/19 by Miguel A. Benitez, André H. Hoang, Benitez, Miguel A. +7
Engineering · Mathematics · #Advanced Numerical Analysis Techniques #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Mathematical Approximation and Integration #Nuclear Theory (nucl-th)
paper · pdf · doi:10.48550/arxiv.2412.15164
openalex publication_date 2024/12/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We update a previous N3LL^′+\cal O(αs3) 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/\rm 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.