Regular Article - Theoretical Physics
Groomed jet mass as a direct probe of collinear parton dynamics
Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, 510006, Guangzhou, China
2 Department of Physics and Astronomy, University of California, 90095, Los Angeles, CA, USA
3 Consortium for Fundamental Physics, Department of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK
4 Department of Physics, Kennesaw State University, 30144, Kennesaw, GA, USA
Accepted: 26 August 2020
Published online: 5 September 2020
We study the link between parton dynamics in the collinear limit and the logarithmically enhanced terms of the groomed jet mass distribution, for jets groomed with the modified mass-drop tagger (mMDT). While the leading-logarithmic (LL) result is linked to collinear evolution with leading-order splitting kernels, here we derive the NLL structure directly from triple-collinear splitting kernels. The calculation we present is a fixed-order calculation in the triple-collinear limit, independent of resummation ingredients and methods. It therefore constitutes a powerful cross-check of the NLL results previously derived using the SCET formalism and provides much of the insight needed for resummation within the traditional QCD approach.
© The Author(s) 2020
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