A Precise Determination of alphas from the Heavy Jet Mass Distribution
- Author(s)
- Miguel Angel Benitez-Rathgeb, Arindam Bhattacharya, André H. Hoang, Vicent Mateu, Matthew D. Schwartz, Iain W. Stewart, Xiaoyuan Zhang
- Abstract
A global fit for alphas(Mz) is performed on available e+e- data for the heavy jet mass distribution. The state-of-the-art theory prediction includes O(as^3) fixed-order results, N3LL' dijet resummation, N2LL Sudakov shoulder resummation, and a first-principles treatment of power corrections in the dijet region. Theoretical correlations are incorporated through a flat random-scan covariance matrix. The global fit results in 0.1145+0.0021-0.0019, compatible with similar determinations from thrust and C-parameter. Dijet resummation is essential for a robust fit, as it engenders insensitivity to the fit-range lower cutoff; without resummation the fit-range sensitivity is overwhelming. In addition, we find evidence for a negative power correction in the trijet region if and only if Sudakov shoulder resummation is included.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Universidad de Salamanca, Harvard University, Cambridge, Harvard University, Massachusetts Institute of Technology, University of Vienna
- DOI
- https://doi.org/10.48550/arXiv.2502.12253
- Publication date
- 02-2025
- Austrian Fields of Science 2012
- 103012 High energy physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/7fd9d9fa-2839-4c95-8301-d1d67d4decf5