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Effects of color reconnection on t(t)over-bar final states at the LHC

Argyropoulos, Spyros and Sjöstrand, Torbjörn LU (2014) In Journal of High Energy Physics
Abstract
The modeling of color reconnection has become one of the dominant sources of systematic uncertainty in the top mass determination at hadron colliders. The uncertainty on the top mass due to color reconnection is conventionally estimated by taking the difference in the predictions of a model with and a model without color reconnection. We show that this procedure underestimates the uncertainty when applied to the existing models in PYTHIA 8. We introduce two new classes of color reconnection models, each containing several variants, which encompass a variety of scenarios that could be realized in nature and we study how they affect the reconstruction of the top mass. After tuning the new models to existing LHC data, the remaining spread of... (More)
The modeling of color reconnection has become one of the dominant sources of systematic uncertainty in the top mass determination at hadron colliders. The uncertainty on the top mass due to color reconnection is conventionally estimated by taking the difference in the predictions of a model with and a model without color reconnection. We show that this procedure underestimates the uncertainty when applied to the existing models in PYTHIA 8. We introduce two new classes of color reconnection models, each containing several variants, which encompass a variety of scenarios that could be realized in nature and we study how they affect the reconstruction of the top mass. After tuning the new models to existing LHC data, the remaining spread of predictions is used to derive a more realistic uncertainty for the top mass, which is found to be around 500 MeV. We also propose how future LHC measurements with t (t) over bar events can be used to further constrain these models and reduce the associated modeling uncertainty. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
QCD Phenomenology, Monte Carlo Simulations
in
Journal of High Energy Physics
issue
11
publisher
Springer
external identifiers
  • wos:000344749600006
  • scopus:84919949072
ISSN
1126-6708
DOI
10.1007/JHEP11(2014)043
language
English
LU publication?
yes
id
1c06f405-a545-443b-aaf5-571f1fc1fa29 (old id 4865188)
date added to LUP
2014-12-18 10:52:44
date last changed
2017-01-01 03:39:09
@article{1c06f405-a545-443b-aaf5-571f1fc1fa29,
  abstract     = {The modeling of color reconnection has become one of the dominant sources of systematic uncertainty in the top mass determination at hadron colliders. The uncertainty on the top mass due to color reconnection is conventionally estimated by taking the difference in the predictions of a model with and a model without color reconnection. We show that this procedure underestimates the uncertainty when applied to the existing models in PYTHIA 8. We introduce two new classes of color reconnection models, each containing several variants, which encompass a variety of scenarios that could be realized in nature and we study how they affect the reconstruction of the top mass. After tuning the new models to existing LHC data, the remaining spread of predictions is used to derive a more realistic uncertainty for the top mass, which is found to be around 500 MeV. We also propose how future LHC measurements with t (t) over bar events can be used to further constrain these models and reduce the associated modeling uncertainty.},
  articleno    = {043},
  author       = {Argyropoulos, Spyros and Sjöstrand, Torbjörn},
  issn         = {1126-6708},
  keyword      = {QCD Phenomenology,Monte Carlo Simulations},
  language     = {eng},
  number       = {11},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Effects of color reconnection on t(t)over-bar final states at the LHC},
  url          = {http://dx.doi.org/10.1007/JHEP11(2014)043},
  year         = {2014},
}