Soft drop
We introduce a new jet substructure technique called “soft drop declustering”, which recursively removes soft wide-angle radiation from a jet. The soft drop algorithm depends on two parameters — a soft threshold z [subscript cut] and an angular exponent β — with the β = 0 limit corresponding roughly...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2015
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| Online Access: | http://hdl.handle.net/1721.1/96319 https://orcid.org/0000-0002-3181-4301 https://orcid.org/0000-0002-2406-8160 |
| _version_ | 1826201351478050816 |
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| author | Marzani, Simone Soyez, Gregory Thaler, Jesse Larkoski, Andrew |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Marzani, Simone Soyez, Gregory Thaler, Jesse Larkoski, Andrew |
| author_sort | Marzani, Simone |
| collection | MIT |
| description | We introduce a new jet substructure technique called “soft drop declustering”, which recursively removes soft wide-angle radiation from a jet. The soft drop algorithm depends on two parameters — a soft threshold z [subscript cut] and an angular exponent β — with the β = 0 limit corresponding roughly to the (modified) mass drop procedure. To gain an analytic understanding of soft drop and highlight the β dependence, we perform resummed calculations for three observables on soft-dropped jets: the energy correlation functions, the groomed jet radius, and the energy loss due to soft drop. The β = 0 limit of the energy loss is particularly interesting, since it is not only “Sudakov safe” but also largely insensitive to the value of the strong coupling constant. While our calculations are strictly accurate only to modified leading-logarithmic order, we also include a discussion of higher-order effects such as multiple emissions and (the absence of) non-global logarithms. We compare our analytic results to parton shower simulations and find good agreement, and we also estimate the impact of non-perturbative effects such as hadronization and the underlying event. Finally, we demonstrate how soft drop can be used for tagging boosted W bosons, and we speculate on the potential advantages of using soft drop for pileup mitigation. |
| first_indexed | 2024-09-23T11:50:34Z |
| format | Article |
| id | mit-1721.1/96319 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:50:34Z |
| publishDate | 2015 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/963192022-09-27T22:16:17Z Soft drop Marzani, Simone Soyez, Gregory Thaler, Jesse Larkoski, Andrew Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Larkoski, Andrew Thaler, Jesse We introduce a new jet substructure technique called “soft drop declustering”, which recursively removes soft wide-angle radiation from a jet. The soft drop algorithm depends on two parameters — a soft threshold z [subscript cut] and an angular exponent β — with the β = 0 limit corresponding roughly to the (modified) mass drop procedure. To gain an analytic understanding of soft drop and highlight the β dependence, we perform resummed calculations for three observables on soft-dropped jets: the energy correlation functions, the groomed jet radius, and the energy loss due to soft drop. The β = 0 limit of the energy loss is particularly interesting, since it is not only “Sudakov safe” but also largely insensitive to the value of the strong coupling constant. While our calculations are strictly accurate only to modified leading-logarithmic order, we also include a discussion of higher-order effects such as multiple emissions and (the absence of) non-global logarithms. We compare our analytic results to parton shower simulations and find good agreement, and we also estimate the impact of non-perturbative effects such as hadronization and the underlying event. Finally, we demonstrate how soft drop can be used for tagging boosted W bosons, and we speculate on the potential advantages of using soft drop for pileup mitigation. 2015-04-01T18:14:35Z 2015-04-01T18:14:35Z 2014-05 2014-02 Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/96319 Larkoski, Andrew J., Simone Marzani, Gregory Soyez, and Jesse Thaler. “Soft Drop.” J. High Energ. Phys. 2014, no. 5 (May 2014). https://orcid.org/0000-0002-3181-4301 https://orcid.org/0000-0002-2406-8160 en_US http://dx.doi.org/10.1007/JHEP05(2014)146 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Marzani, Simone Soyez, Gregory Thaler, Jesse Larkoski, Andrew Soft drop |
| title | Soft drop |
| title_full | Soft drop |
| title_fullStr | Soft drop |
| title_full_unstemmed | Soft drop |
| title_short | Soft drop |
| title_sort | soft drop |
| url | http://hdl.handle.net/1721.1/96319 https://orcid.org/0000-0002-3181-4301 https://orcid.org/0000-0002-2406-8160 |
| work_keys_str_mv | AT marzanisimone softdrop AT soyezgregory softdrop AT thalerjesse softdrop AT larkoskiandrew softdrop |