Photon isolation and jet substructure
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 featu...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-09-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP09(2018)164 |
| _version_ | 1818297233448108032 |
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| author | Zachary Hall Jesse Thaler |
| author_facet | Zachary Hall Jesse Thaler |
| author_sort | Zachary Hall |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-13T04:16:11Z |
| format | Article |
| id | doaj.art-03b9207b95394223859637307d143932 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-13T04:16:11Z |
| publishDate | 2018-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-03b9207b95394223859637307d1439322022-12-21T23:59:52ZengSpringerOpenJournal of High Energy Physics1029-84792018-09-012018912410.1007/JHEP09(2018)164Photon isolation and jet substructureZachary Hall0Jesse Thaler1Center for Theoretical Physics, Massachusetts Institute of TechnologyCenter for Theoretical Physics, Massachusetts Institute of TechnologyAbstract 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.http://link.springer.com/article/10.1007/JHEP09(2018)164JetsQCD Phenomenology |
| spellingShingle | Zachary Hall Jesse Thaler Photon isolation and jet substructure Journal of High Energy Physics Jets QCD Phenomenology |
| title | Photon isolation and jet substructure |
| title_full | Photon isolation and jet substructure |
| title_fullStr | Photon isolation and jet substructure |
| title_full_unstemmed | Photon isolation and jet substructure |
| title_short | Photon isolation and jet substructure |
| title_sort | photon isolation and jet substructure |
| topic | Jets QCD Phenomenology |
| url | http://link.springer.com/article/10.1007/JHEP09(2018)164 |
| work_keys_str_mv | AT zacharyhall photonisolationandjetsubstructure AT jessethaler photonisolationandjetsubstructure |