Soft evolution of multi-jet final states
We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color ev...
| 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/1721.1/96310 https://orcid.org/0000-0002-9675-7133 |
| _version_ | 1826214501027938304 |
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| author | Gerwick, Erik Schumann, Steffen Höche, Stefan Marzani, Simone |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Gerwick, Erik Schumann, Steffen Höche, Stefan Marzani, Simone |
| author_sort | Gerwick, Erik |
| collection | MIT |
| description | We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color evolution of the soft function at next-to-leading-logarithmic accuracy, namely the selection of the color bases and the projections of color operators and Born amplitudes onto those bases. Explicit results for all QCD processes with up to 2 → 5 partons are given. We also devise a new tree-level matching scheme for resummed calculations which exploits a quasi-local subtraction based on the Catani-Seymour dipole formalism. We implement both resummation and matching in the Sherpa event generator. As a proof of concept, we compute the resummed and matched transverse-thrust distribution for hadronic collisions. |
| first_indexed | 2024-09-23T16:06:45Z |
| format | Article |
| id | mit-1721.1/96310 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:06:45Z |
| publishDate | 2015 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/963102022-10-02T06:22:50Z Soft evolution of multi-jet final states Gerwick, Erik Schumann, Steffen Höche, Stefan Marzani, Simone Massachusetts Institute of Technology. Center for Theoretical Physics Massachusetts Institute of Technology. Department of Physics Marzani, Simone We present a new framework for computing resummed and matched distributions in processes with many hard QCD jets. The intricate color structure of soft gluon emission at large angles renders resummed calculations highly non-trivial in this case. We automate all ingredients necessary for the color evolution of the soft function at next-to-leading-logarithmic accuracy, namely the selection of the color bases and the projections of color operators and Born amplitudes onto those bases. Explicit results for all QCD processes with up to 2 → 5 partons are given. We also devise a new tree-level matching scheme for resummed calculations which exploits a quasi-local subtraction based on the Catani-Seymour dipole formalism. We implement both resummation and matching in the Sherpa event generator. As a proof of concept, we compute the resummed and matched transverse-thrust distribution for hadronic collisions. United States. Dept. of Energy (Contract DE-AC02-76SF00515) United States. Dept. of Energy (Contract DE-SC00012567) National Science Foundation (U.S.) (Grant PHY-0969510) Germany. Federal Ministry of Education and Research (Contract 05H12MG5) European Union. Framework Programme 7 (Marie Curie Training Network. Contract PITN-GA-2012-315877) 2015-04-01T16:37:01Z 2015-04-01T16:37:01Z 2015-02 2014-12 Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/96310 Gerwick, Erik, Steffen Schumann, Stefan Höche, and Simone Marzani. “Soft Evolution of Multi-Jet Final States.” J. High Energ. Phys. 2015, no. 2 (February 2015). https://orcid.org/0000-0002-9675-7133 en_US http://dx.doi.org/10.1007/jhep02(2015)106 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Gerwick, Erik Schumann, Steffen Höche, Stefan Marzani, Simone Soft evolution of multi-jet final states |
| title | Soft evolution of multi-jet final states |
| title_full | Soft evolution of multi-jet final states |
| title_fullStr | Soft evolution of multi-jet final states |
| title_full_unstemmed | Soft evolution of multi-jet final states |
| title_short | Soft evolution of multi-jet final states |
| title_sort | soft evolution of multi jet final states |
| url | http://hdl.handle.net/1721.1/96310 https://orcid.org/0000-0002-9675-7133 |
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