Nonperturbative corrections to soft drop jet mass

Author(s)
André H. Hoang, Sonny Mantry, Aditya Pathak, Iain W. Stewart
Abstract

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.

Organisation(s)
Particle Physics, Research Platform Erwin Schrödinger International Institute for Mathematics and Physics
External organisation(s)
University of North Georgia, Massachusetts Institute of Technology
Journal
Journal of High Energy Physics
Volume
2019
No. of pages
81
ISSN
1029-8479
DOI
https://doi.org/10.1007/JHEP12(2019)002
Publication date
12-2019
Peer reviewed
Yes
Austrian Fields of Science 2012
103012 High energy physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/nonperturbative-corrections-to-soft-drop-jet-mass(8957bc12-4fd7-4584-9ffb-3aefe6d35599).html