Photon isolation and jet substructure
Name
1082867284-MIT.pdf
Description
Full printable version
Size
10.53 MB
Format
Adobe PDF
Checksum (MD5)
be70eb6e4421a90cbf6d0a42e614ccdd
Author(s)
Hall, Zachary (Zachary H.)
Advisor(s)
Jesse Thaler.
Date Issued
2018
Publisher
Massachusetts Institute of Technology
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 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.
Description
Thesis: S.B., Massachusetts Institute of Technology, Department of Physics, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 41-45).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
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