Merging parton showers and matrix elements -- back to basics
Lavesson, Nils LU and Lönnblad, Leif LU
(2008)
In Journal of High Energy Physics
4(85).
- Abstract
- We make a thorough comparison between different schemes of merging fixed-order tree-level matrix element generators with parton-shower models. We use the most basic benchmark of the O(alpha_S) correction to e+e- -> jets, where the simple kinematics allows us to study in detail the transition between the matrix-element and parton-shower regions. We find that the CKKW-based schemes give a reasonably smooth transition between these regions, although problems may occur if the parton shower used is not ordered in transverse momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have potentially serious problems due to different scale definitions in different regions of phase space, and due to sensitivity to the details in... (More)
- We make a thorough comparison between different schemes of merging fixed-order tree-level matrix element generators with parton-shower models. We use the most basic benchmark of the O(alpha_S) correction to e+e- -> jets, where the simple kinematics allows us to study in detail the transition between the matrix-element and parton-shower regions. We find that the CKKW-based schemes give a reasonably smooth transition between these regions, although problems may occur if the parton shower used is not ordered in transverse momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have potentially serious problems due to different scale definitions in different regions of phase space, and due to sensitivity to the details in the initial conditions of the parton shower programs used. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/773444
- author
- Lavesson, Nils
LU
and Lönnblad, Leif
LU
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Phenomenological Models, Jets, Parton Model, QCD
- in
- Journal of High Energy Physics
- volume
- 4
- issue
- 85
- publisher
- Springer
- external identifiers
-
- wos:000255662900085
- scopus:44449083999
- ISSN
- 1029-8479
- DOI
- 10.1088/1126-6708/2008/04/085
- language
- English
- LU publication?
- yes
- id
- f13d24e4-5bd0-4a41-b189-d5bf9ba06dd1 (old id 773444)
- alternative location
- http://arxiv.org/pdf/0712.2966
- date added to LUP
- 2016-04-01 12:06:36
- date last changed
- 2024-02-06 21:14:41
@article{f13d24e4-5bd0-4a41-b189-d5bf9ba06dd1,
abstract = {{We make a thorough comparison between different schemes of merging fixed-order tree-level matrix element generators with parton-shower models. We use the most basic benchmark of the O(alpha_S) correction to e+e- -> jets, where the simple kinematics allows us to study in detail the transition between the matrix-element and parton-shower regions. We find that the CKKW-based schemes give a reasonably smooth transition between these regions, although problems may occur if the parton shower used is not ordered in transverse momentum. However, the so-called Pseudo-Shower and MLM schemes turn out to have potentially serious problems due to different scale definitions in different regions of phase space, and due to sensitivity to the details in the initial conditions of the parton shower programs used.}},
author = {{Lavesson, Nils and Lönnblad, Leif}},
issn = {{1029-8479}},
keywords = {{Phenomenological Models; Jets; Parton Model; QCD}},
language = {{eng}},
number = {{85}},
publisher = {{Springer}},
series = {{Journal of High Energy Physics}},
title = {{Merging parton showers and matrix elements -- back to basics}},
url = {{http://dx.doi.org/10.1088/1126-6708/2008/04/085}},
doi = {{10.1088/1126-6708/2008/04/085}},
volume = {{4}},
year = {{2008}},
}