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Energy and virtuality scale dependence in quark and gluon jets

Gustafson, Gösta LU and Edén, Patrik LU (1998) In Journal of High Energy Physics 1998(JHEP09(1998)).
Abstract
We discuss some important issues concerning multiplicities in quark and gluon jets in e+e- annihilation. In QCD the properties of a jet in general depend on two scales, the energy and virtuality of the jet. Frequently theoretical predictions apply to a situation where these scales coincide, while for experimental data they are often different. Thus an analysis to extract e.g. the asymptotic multiplicity ratio CF/CA between quark and gluon jets, needs a carefully specified jet definition, together with a calculation of nonleading corrections to the multiplicity evolution. We propose methods to systematically study the separate dependence upon the two scales in experimental data and compare the results with theory. We present jet finding... (More)
We discuss some important issues concerning multiplicities in quark and gluon jets in e+e- annihilation. In QCD the properties of a jet in general depend on two scales, the energy and virtuality of the jet. Frequently theoretical predictions apply to a situation where these scales coincide, while for experimental data they are often different. Thus an analysis to extract e.g. the asymptotic multiplicity ratio CF/CA between quark and gluon jets, needs a carefully specified jet definition, together with a calculation of nonleading corrections to the multiplicity evolution. We propose methods to systematically study the separate dependence upon the two scales in experimental data and compare the results with theory. We present jet finding algorithms which corresponds well to the theoretically considered jets. We also show that recoil effects add corrections to the modified leading log approximation which are quantitatively important, though formally suppressed at high energies. (Less)
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author
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type
Contribution to journal
publication status
published
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in
Journal of High Energy Physics
volume
1998
issue
JHEP09(1998)
article number
015
publisher
Springer
external identifiers
  • scopus:84865925172
ISSN
1029-8479
DOI
10.1088/1126-6708/1998/09/015
language
English
LU publication?
yes
id
efc2f472-cda9-4d8c-af92-3773e7a34940
date added to LUP
2019-05-21 14:24:40
date last changed
2024-01-01 05:57:57
@article{efc2f472-cda9-4d8c-af92-3773e7a34940,
  abstract     = {{We discuss some important issues concerning multiplicities in quark and gluon jets in e+e- annihilation. In QCD the properties of a jet in general depend on two scales, the energy and virtuality of the jet. Frequently theoretical predictions apply to a situation where these scales coincide, while for experimental data they are often different. Thus an analysis to extract e.g. the asymptotic multiplicity ratio CF/CA between quark and gluon jets, needs a carefully specified jet definition, together with a calculation of nonleading corrections to the multiplicity evolution. We propose methods to systematically study the separate dependence upon the two scales in experimental data and compare the results with theory. We present jet finding algorithms which corresponds well to the theoretically considered jets. We also show that recoil effects add corrections to the modified leading log approximation which are quantitatively important, though formally suppressed at high energies.}},
  author       = {{Gustafson, Gösta and Edén, Patrik}},
  issn         = {{1029-8479}},
  language     = {{eng}},
  number       = {{JHEP09(1998)}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Energy and virtuality scale dependence in quark and gluon jets}},
  url          = {{http://dx.doi.org/10.1088/1126-6708/1998/09/015}},
  doi          = {{10.1088/1126-6708/1998/09/015}},
  volume       = {{1998}},
  year         = {{1998}},
}