Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Using neural networks to identify jets

Lönnblad, Leif LU orcid ; Peterson, Carsten LU and Rögnvaldsson, Thorsteinn (1991) In Nuclear Physics, Section B 349(3). p.675-702
Abstract

A neural network method for identifying the ancestor of a hadron jet is presented. The idea is to find an efficient mapping between certain observed hadronic kinematical variables and the quark-gluon identity. This is done with a neuronic expansion in terms of a network of sigmoidal functions using a gradient descent procedure, where the errors are back-propagated through the network. With this method we are able to separate gluon from quark jets originating from Monte Carlo generated e+e- events with ≈85% approach. The result is independent of the MC model used. This approach for isolating the gluon jet is then used to study the so-called string effect. In addition, heavy quarks (b and c) in... (More)

A neural network method for identifying the ancestor of a hadron jet is presented. The idea is to find an efficient mapping between certain observed hadronic kinematical variables and the quark-gluon identity. This is done with a neuronic expansion in terms of a network of sigmoidal functions using a gradient descent procedure, where the errors are back-propagated through the network. With this method we are able to separate gluon from quark jets originating from Monte Carlo generated e+e- events with ≈85% approach. The result is independent of the MC model used. This approach for isolating the gluon jet is then used to study the so-called string effect. In addition, heavy quarks (b and c) in e+e- reactions can be identified on the 50% level by just observing the hadrons. In particular we are able to separate b-quarks with an efficiency and purity, which is comparable with what is expected from vertex detectors. We also speculate on how the neutral network method can be used to disentangle different hadronization schemes by compressing the dimensionality of the state space of hadrons.

(Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nuclear Physics, Section B
volume
349
issue
3
pages
28 pages
publisher
North-Holland
external identifiers
  • scopus:0041834419
ISSN
0550-3213
DOI
10.1016/0550-3213(91)90392-B
language
English
LU publication?
yes
id
821fbd3e-e4c5-4013-95f3-b45da15dab63
date added to LUP
2019-05-15 07:55:53
date last changed
2024-01-01 04:41:00
@article{821fbd3e-e4c5-4013-95f3-b45da15dab63,
  abstract     = {{<p>A neural network method for identifying the ancestor of a hadron jet is presented. The idea is to find an efficient mapping between certain observed hadronic kinematical variables and the quark-gluon identity. This is done with a neuronic expansion in terms of a network of sigmoidal functions using a gradient descent procedure, where the errors are back-propagated through the network. With this method we are able to separate gluon from quark jets originating from Monte Carlo generated e<sup>+</sup>e<sup>-</sup> events with ≈85% approach. The result is independent of the MC model used. This approach for isolating the gluon jet is then used to study the so-called string effect. In addition, heavy quarks (b and c) in e<sup>+</sup>e<sup>-</sup> reactions can be identified on the 50% level by just observing the hadrons. In particular we are able to separate b-quarks with an efficiency and purity, which is comparable with what is expected from vertex detectors. We also speculate on how the neutral network method can be used to disentangle different hadronization schemes by compressing the dimensionality of the state space of hadrons.</p>}},
  author       = {{Lönnblad, Leif and Peterson, Carsten and Rögnvaldsson, Thorsteinn}},
  issn         = {{0550-3213}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{3}},
  pages        = {{675--702}},
  publisher    = {{North-Holland}},
  series       = {{Nuclear Physics, Section B}},
  title        = {{Using neural networks to identify jets}},
  url          = {{http://dx.doi.org/10.1016/0550-3213(91)90392-B}},
  doi          = {{10.1016/0550-3213(91)90392-B}},
  volume       = {{349}},
  year         = {{1991}},
}