Hamilton, K;
Medves, R;
Salam, GP;
Scyboz, L;
Soyez, G;
(2021)
Colour and logarithmic accuracy in final-state parton showers.
Journal of High Energy Physics
, Article 41. 10.1007/JHEP03(2021)041.
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Abstract
Standard dipole parton showers are known to yield incorrect subleading-colour contributions to the leading (double) logarithmic terms for a variety of observables. In this work, concentrating on final-state showers, we present two simple, computationally efficient prescriptions to correct this problem, exploiting a Lund-diagram type classification of emission regions. We study the resulting effective multiple-emission matrix elements generated by the shower, and discuss their impact on subleading colour contributions to leading and next-to-leading logarithms (NLL) for a range of observables. In particular we show that the new schemes give the correct full colour NLL terms for global observables and multiplicities. Subleading colour issues remain at NLL (single logarithms) for non-global observables, though one of our two schemes reproduces the correct full-colour matrix-element for any number of energy-ordered commensurate-angle pairs of emissions. While we carry out our tests within the PanScales shower framework, the schemes are sufficiently simple that it should be straightforward to implement them also in other shower frameworks.
| Type: | Article |
|---|---|
| Title: | Colour and logarithmic accuracy in final-state parton showers |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP03(2021)041 |
| Publisher version: | https://doi.org/10.1007/JHEP03(2021)041 |
| Language: | English |
| Additional information: | © 2021 Springer Nature Switzerland AG. This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10119021 |
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