A Precise Determination of α_s from the Heavy Jet Mass Distribution

2025/02/17 by Miguel A. Benitez, Arindam Bhattacharya, Benitez, Miguel A. +11
Physics and Astronomy · Earth and Planetary Sciences · Engineering · #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Computational Fluid Dynamics and Aerodynamics

paper · pdf · doi:10.48550/arxiv.2502.12253

Abstract

A global fit for α_s(m_Z) is performed on available e⁺e^- data for the heavy jet mass distribution. The state-of-the-art theory prediction includes O(α_s³) 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 0.1148^{+ 0.0015}_-0.0022, 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.

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