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String effects on Fermi-Dirac correlation measurements

Delgado, R. M. Duran; Gustafson, Gösta LU and Lönnblad, Leif LU (2007) In European Physical Journal C. Particles and Fields 52(1). p.113-119
Abstract
We investigate some recent measurements of Fermi-Dirac correlations by the LEP collaborations indicating surprisingly small source radii for the production of baryons in e(+)e(-) annihilation at the Z(0) peak. In hadronization models there is besides the Fermi-Dirac correlation effect also a strong dynamical (anti-) correlation. We demonstrate that the extraction of the pure FD effect is highly dependent on a realistic Monte Carlo event generator, both for separation of those dynamical correlations that are not related to Fermi-Dirac statistics, and for corrections of the data and background subtractions. Although the model can be tuned to well reproduce single particle distributions, there are large model uncertainties when it comes to... (More)
We investigate some recent measurements of Fermi-Dirac correlations by the LEP collaborations indicating surprisingly small source radii for the production of baryons in e(+)e(-) annihilation at the Z(0) peak. In hadronization models there is besides the Fermi-Dirac correlation effect also a strong dynamical (anti-) correlation. We demonstrate that the extraction of the pure FD effect is highly dependent on a realistic Monte Carlo event generator, both for separation of those dynamical correlations that are not related to Fermi-Dirac statistics, and for corrections of the data and background subtractions. Although the model can be tuned to well reproduce single particle distributions, there are large model uncertainties when it comes to correlations between identical baryons. We therefore, unfortunately, have to conclude that it is at present not possible to draw any firm conclusion about the source radii relevant for baryon production at LEP. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
52
issue
1
pages
113 - 119
publisher
Springer
external identifiers
  • wos:000249019600008
  • scopus:34548217282
ISSN
1434-6044
DOI
10.1140/epjc/s10052-007-0358-8
language
English
LU publication?
yes
id
18a9757c-81f8-4bcd-a30a-519b23a8bcef (old id 689470)
date added to LUP
2007-12-07 11:50:22
date last changed
2017-01-01 07:19:29
@article{18a9757c-81f8-4bcd-a30a-519b23a8bcef,
  abstract     = {We investigate some recent measurements of Fermi-Dirac correlations by the LEP collaborations indicating surprisingly small source radii for the production of baryons in e(+)e(-) annihilation at the Z(0) peak. In hadronization models there is besides the Fermi-Dirac correlation effect also a strong dynamical (anti-) correlation. We demonstrate that the extraction of the pure FD effect is highly dependent on a realistic Monte Carlo event generator, both for separation of those dynamical correlations that are not related to Fermi-Dirac statistics, and for corrections of the data and background subtractions. Although the model can be tuned to well reproduce single particle distributions, there are large model uncertainties when it comes to correlations between identical baryons. We therefore, unfortunately, have to conclude that it is at present not possible to draw any firm conclusion about the source radii relevant for baryon production at LEP.},
  author       = {Delgado, R. M. Duran and Gustafson, Gösta and Lönnblad, Leif},
  issn         = {1434-6044},
  language     = {eng},
  number       = {1},
  pages        = {113--119},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {String effects on Fermi-Dirac correlation measurements},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-007-0358-8},
  volume       = {52},
  year         = {2007},
}