Matrix element corrections in the PYTHIA8 parton shower in the context of matched simulations at next-to-leading order
Abstract
We discuss the role of matrix element corrections (MEC) to parton showers in the context of MC@NLO-type matchings for processes that feature unstable resonances, where MEC are liable to result in double-counting issues, and are thus generally not employed. By working with PYTHIA8, we show that disabling all MEC is actually unnecessary in computations based on the narrow-width approximation, and we propose alternative MEC settings which, while still avoiding double counting, allow one to include hard-recoil effects in the simulations of resonance decays. We illustrate our findings by considering $$t\overline{t}$$ production at the LHC, and by comparing MadGraph5-aMC@NLO predictions with those of POWHEG-BOX and standalone PYTHIA8.
- Authors:
-
[2];
- Istituto Nazionale di Fisica Nucleare (INFN) (Italy)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1996950
- Report Number(s):
- FERMILAB-PUB-23-413-CSAID; arXiv:2308.06389
Journal ID: ISSN 1434-6052; oai:inspirehep.net:2687815; TRN: US2405173
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- European Physical Journal. C, Particles and Fields (Online)
- Additional Journal Information:
- Journal Name: European Physical Journal. C, Particles and Fields (Online); Journal Volume: 83; Journal Issue: 10; Journal ID: ISSN 1434-6052
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Frixione, Stefano, Amoroso, Simone, and Mrenna, Stephen. Matrix element corrections in the PYTHIA8 parton shower in the context of matched simulations at next-to-leading order. United States: N. p., 2023.
Web. doi:10.1140/epjc/s10052-023-12154-x.
Frixione, Stefano, Amoroso, Simone, & Mrenna, Stephen. Matrix element corrections in the PYTHIA8 parton shower in the context of matched simulations at next-to-leading order. United States. https://doi.org/10.1140/epjc/s10052-023-12154-x
Frixione, Stefano, Amoroso, Simone, and Mrenna, Stephen. Fri .
"Matrix element corrections in the PYTHIA8 parton shower in the context of matched simulations at next-to-leading order". United States. https://doi.org/10.1140/epjc/s10052-023-12154-x. https://www.osti.gov/servlets/purl/1996950.
@article{osti_1996950,
title = {Matrix element corrections in the PYTHIA8 parton shower in the context of matched simulations at next-to-leading order},
author = {Frixione, Stefano and Amoroso, Simone and Mrenna, Stephen},
abstractNote = {We discuss the role of matrix element corrections (MEC) to parton showers in the context of MC@NLO-type matchings for processes that feature unstable resonances, where MEC are liable to result in double-counting issues, and are thus generally not employed. By working with PYTHIA8, we show that disabling all MEC is actually unnecessary in computations based on the narrow-width approximation, and we propose alternative MEC settings which, while still avoiding double counting, allow one to include hard-recoil effects in the simulations of resonance decays. We illustrate our findings by considering $t\overline{t}$ production at the LHC, and by comparing MadGraph5-aMC@NLO predictions with those of POWHEG-BOX and standalone PYTHIA8.},
doi = {10.1140/epjc/s10052-023-12154-x},
journal = {European Physical Journal. C, Particles and Fields (Online)},
number = 10,
volume = 83,
place = {United States},
year = {Fri Oct 27 00:00:00 EDT 2023},
month = {Fri Oct 27 00:00:00 EDT 2023}
}
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