Photon isolation and jet substructure
Name
13130_2018_Article_9092.pdf
Size
800.81 KB
Format
Adobe PDF
Checksum (MD5)
fe547d4c4dba098f36048cc40868a38f
Author(s)
Hall, Zachary
Thaler, Jesse
Date Issued
September 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Hall, Zachary, and Jesse Thaler. “Photon Isolation and Jet Substructure.” Journal of High Energy Physics, vol. 2018, no. 9, Sept. 2018. © 2018 The Authors
Version
Final published version
Abstract
We introduce soft drop isolation, a new photon isolation criterion inspired by jet substructure techniques. Soft drop isolation is collinear safe and is equivalent to Frixione isolation at leading non-trivial order in the small R limit. However, soft drop isolation has the interesting feature of being democratic, meaning that photons can be treated equivalently to hadrons for initial jet clustering. Taking advantage of this democratic property, we define an isolated photon subjet: a photon that is not isolated from its parent jet but is isolated within its parent subjet after soft drop declustering. The kinematics of this isolated photon subjet can be used to expose the QED splitting function, in which a quark radiates a photon, and we verify this behavior using both a parton shower generator and a perturbative calculation in the collinear limit. Keywords: Jets, QCD Phenomenology
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP09(2018)164
