Hamilton, Keith;
Karlberg, Alexander;
Salam, Gavin PP;
Scyboz, Ludovic;
Verheyen, Rob;
(2023)
Matching and event-shape NNDL accuracy in parton showers.
Journal of High Energy Physics
, 2023
, Article 224. 10.1007/JHEP03(2023)224.
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Abstract
To explore the interplay of NLO matching and next-to-leading logarithmic (NLL) parton showers, we consider the simplest case of γ* and Higgs-boson decays to qq¯¯and gg respectively. Not only should shower NLL accuracy be retained across observables after matching, but for global event-shape observables and the two-jet rate, matching can augment the shower in such a way that it additionally achieves next-to-next-to-double-logarithmic (NNDL) accuracy, a first step on the route towards general NNLL. As a proof-of-concept exploration of this question, we consider direct application of multiplicative matrix-element corrections, as well as simple implementations of MC@NLO and POWHEG-style matching. We find that the first two straightforwardly bring NNDL accuracy, and that this can also be achieved with POWHEG, although particular care is needed in the handover between POWHEG and the shower. Our study involves both analytic and numerical components and we also touch on some phenomenological considerations.
| Type: | Article |
|---|---|
| Title: | Matching and event-shape NNDL accuracy in parton showers |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP03(2023)224 |
| Publisher version: | https://doi.org/10.1007/JHEP03(2023)224 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
| Keywords: | Science & Technology, Physical Sciences, Physics, Particles & Fields, Physics, Higher-Order Perturbative Calculations, Parton Shower, Resummation, CROSS-SECTIONS, JETS |
| 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-pp.ucl.ac.uk/id/eprint/10169933 |
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