A Precise Determination of from the Heavy Jet Mass Distribution
Miguel A. Benitez🇪🇸 · Arindam Bhattacharya🇺🇸 · Andre H. Hoang🇦🇹 · Vicent Mateu🇪🇸 · Matthew D. Schwartz🇺🇸 · Iain W. Stewart🇦🇹 · Xiaoyuan Zhang🇺🇸
A global fit for is performed on available data for the heavy jet mass distribution. The state-of-the-art theory prediction includes fixed-order results, NLL dijet resummation, NLL 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 , compatible with similar determinations from thrust and -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.