Color matrix element corrections for parton showers
(2018) In Journal of High Energy Physics 2018(11).- Abstract
We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon emission, gluon splitting, initial state branching processes, as well as hadronization. The subleading Nc terms are included as color matrix element corrections to the splitting kernels by evolving an amplitude-level density operator and correcting the radiation pattern for each parton multiplicity, up to a fixed number of full color emissions, after which a standard leading color shower takes over. Our results are compared to data for a wide range of LEP and LHC observables and show that the subleading Nc corrections tend to... (More)
We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon emission, gluon splitting, initial state branching processes, as well as hadronization. The subleading Nc terms are included as color matrix element corrections to the splitting kernels by evolving an amplitude-level density operator and correcting the radiation pattern for each parton multiplicity, up to a fixed number of full color emissions, after which a standard leading color shower takes over. Our results are compared to data for a wide range of LEP and LHC observables and show that the subleading Nc corrections tend to be small for most observables probing hard, perturbative dynamics, for both LEP and LHC. However, for some of these observables they exceed 10%. On soft physics we find signs of significantly larger effects.
(Less)
- author
- Plätzer, Simon LU ; Sjodahl, Malin LU and Thorén, Johan LU
- organization
- publishing date
- 2018-11-05
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- QCD Phenomenology
- in
- Journal of High Energy Physics
- volume
- 2018
- issue
- 11
- article number
- 9
- publisher
- Springer
- external identifiers
-
- scopus:85056136851
- ISSN
- 1029-8479
- DOI
- 10.1007/JHEP11(2018)009
- project
- Innovative Network for Monte Carlo Event Generators for LHC Physics
- language
- English
- LU publication?
- yes
- id
- 886ec6ae-ef2f-432a-a83f-2af1aa8ebce6
- date added to LUP
- 2018-11-22 12:14:58
- date last changed
- 2024-04-01 15:57:53
@article{886ec6ae-ef2f-432a-a83f-2af1aa8ebce6,
abstract = {{<p>We investigate the effects of keeping the full color structure for parton emissions in parton showers for both LEP and LHC. This is done within the Herwig 7 dipole shower, and includes gluon emission, gluon splitting, initial state branching processes, as well as hadronization. The subleading N<sub>c</sub> terms are included as color matrix element corrections to the splitting kernels by evolving an amplitude-level density operator and correcting the radiation pattern for each parton multiplicity, up to a fixed number of full color emissions, after which a standard leading color shower takes over. Our results are compared to data for a wide range of LEP and LHC observables and show that the subleading N<sub>c</sub> corrections tend to be small for most observables probing hard, perturbative dynamics, for both LEP and LHC. However, for some of these observables they exceed 10%. On soft physics we find signs of significantly larger effects.</p>}},
author = {{Plätzer, Simon and Sjodahl, Malin and Thorén, Johan}},
issn = {{1029-8479}},
keywords = {{QCD Phenomenology}},
language = {{eng}},
month = {{11}},
number = {{11}},
publisher = {{Springer}},
series = {{Journal of High Energy Physics}},
title = {{Color matrix element corrections for parton showers}},
url = {{http://dx.doi.org/10.1007/JHEP11(2018)009}},
doi = {{10.1007/JHEP11(2018)009}},
volume = {{2018}},
year = {{2018}},
}