Nonperturbative corrections to soft drop jet mass

André H. Hoang, Sonny Mantry, Aditya Pathak, Iain W. Stewart

Publications: Contribution to journalArticlePeer Reviewed


We provide a quantum field theory based description of the nonperturbative effects from hadronization for soft drop groomed jet mass distributions using the soft- collinear effective theory and the coherent branching formalism. There are two distinct regions of jet mass mJ where grooming modifies hadronization effects. In a region with intermediate mJ an operator expansion can be used, and the leading power corrections are given by three universal nonperturbative parameters that are independent of all kinematic variables and grooming parameters, and only depend on whether the parton initiating the jet is a quark or gluon. The leading power corrections in this region cannot be described by a standard normalized shape function. These power corrections depend on the kinematics of the subjet that stops soft drop through short distance coefficients, which encode a perturbatively calculable dependence on the jet transverse momentum, jet rapidity, and on the soft drop grooming parameters zcut and β. Determining this dependence requires a resummation of large logarithms, which we carry out at LL order. For smaller mJ there is a nonperturbative region described by a one-dimensional shape function that is unusual because it is not normalized to unity, and has a non-trivial dependence on β.
Original languageEnglish
Article number2
Number of pages81
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - Dec 2019

Austrian Fields of Science 2012

  • 103012 High energy physics


  • Effective Field Theories
  • Nonperturbative Effects
  • Perturbative QCD
  • Re-summation
  • Re- summation

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