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Effects of overlapping strings in pp collisions

Bierlich, Christian LU ; Gustafson, Gösta LU ; Lönnblad, Leif LU and Tarasov, Andrey (2015) In Journal of High Energy Physics
Abstract
In models for hadron collisions based on string hadronization, the strings are usually treated as independent, allowing no interaction between the confined colour fields. In studies of nucleus collisions it has been suggested that strings close in space can fuse to form "colour ropes". Such ropes are expected to give more strange particles and baryons, which also has been suggested as a signal for plasma formation. Overlapping strings can also be expected in pp collisions, where usually no phase transition is expected. In particular at the high LHC energies the expected density of strings is quite high. To investigate possible effects of rope formation, we present a model in which strings are allowed to combine into higher multiplets,... (More)
In models for hadron collisions based on string hadronization, the strings are usually treated as independent, allowing no interaction between the confined colour fields. In studies of nucleus collisions it has been suggested that strings close in space can fuse to form "colour ropes". Such ropes are expected to give more strange particles and baryons, which also has been suggested as a signal for plasma formation. Overlapping strings can also be expected in pp collisions, where usually no phase transition is expected. In particular at the high LHC energies the expected density of strings is quite high. To investigate possible effects of rope formation, we present a model in which strings are allowed to combine into higher multiplets, giving rise to increased production of baryons and strangeness, or recombine into singlet structures and vanish. Also a crude model for strings recombining into junction structures is considered, again giving rise to increased baryon production. The models are implemented in the dipsy MC event generator, using Pythia8 for hadronization, and comparison to pp minimum bias data, reveals improvement in the description of identified particle spectra. (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
3
publisher
Springer
external identifiers
  • wos:000351751200008
  • scopus:84961288122
ISSN
1126-6708
DOI
10.1007/JHEP03(2015)148
language
English
LU publication?
yes
id
c19360ea-36ff-4535-84c2-2db36ae18d59 (old id 5277910)
date added to LUP
2015-04-24 09:57:25
date last changed
2017-11-05 03:20:30
@article{c19360ea-36ff-4535-84c2-2db36ae18d59,
  abstract     = {In models for hadron collisions based on string hadronization, the strings are usually treated as independent, allowing no interaction between the confined colour fields. In studies of nucleus collisions it has been suggested that strings close in space can fuse to form "colour ropes". Such ropes are expected to give more strange particles and baryons, which also has been suggested as a signal for plasma formation. Overlapping strings can also be expected in pp collisions, where usually no phase transition is expected. In particular at the high LHC energies the expected density of strings is quite high. To investigate possible effects of rope formation, we present a model in which strings are allowed to combine into higher multiplets, giving rise to increased production of baryons and strangeness, or recombine into singlet structures and vanish. Also a crude model for strings recombining into junction structures is considered, again giving rise to increased baryon production. The models are implemented in the dipsy MC event generator, using Pythia8 for hadronization, and comparison to pp minimum bias data, reveals improvement in the description of identified particle spectra.},
  articleno    = {148},
  author       = {Bierlich, Christian and Gustafson, Gösta and Lönnblad, Leif and Tarasov, Andrey},
  issn         = {1126-6708},
  keyword      = {QCD Phenomenology,Monte Carlo Simulations},
  language     = {eng},
  number       = {3},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Effects of overlapping strings in pp collisions},
  url          = {http://dx.doi.org/10.1007/JHEP03(2015)148},
  year         = {2015},
}