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String formation beyond leading colour

Christiansen, Jesper Roy LU and Skands, Peter Z. (2015) In Journal of High Energy Physics
Abstract
We present a new model for the hadronisation of multi-parton systems, in which colour correlations beyond leading N-C are allowed to influence the formation of confining potentials (strings). The multiplet structure of SU(3) is combined with a minimisation of the string potential energy, to decide between which partons strings should form, allowing also for "baryonic" configurations (e.g., two colours can combine coherently to form an anticolour). In e(+)e (-) collisions, modifications to the leading-colour picture are small, suppressed by both colour and kinematics factors. But in pp collisions, multi-parton interactions increase the number of possible subleading connections, counteracting their naive 1/N-C(2) suppression. Moreover, those... (More)
We present a new model for the hadronisation of multi-parton systems, in which colour correlations beyond leading N-C are allowed to influence the formation of confining potentials (strings). The multiplet structure of SU(3) is combined with a minimisation of the string potential energy, to decide between which partons strings should form, allowing also for "baryonic" configurations (e.g., two colours can combine coherently to form an anticolour). In e(+)e (-) collisions, modifications to the leading-colour picture are small, suppressed by both colour and kinematics factors. But in pp collisions, multi-parton interactions increase the number of possible subleading connections, counteracting their naive 1/N-C(2) suppression. Moreover, those that reduce the overall string lengths are kine-matically favoured. The model, which we have implemented in the PYTHIA 8 generator, is capable of reaching agreement not only with the important < p perpendicular to >(n(charged)) distribution but also with measured rates (and ratios) of kaons and hyperons, in both ee and pp collisions. Nonetheless, the shape of their p perpendicular to spectra remains challenging to explain. (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
8
publisher
Springer
external identifiers
  • wos:000359049900001
  • scopus:84938584429
ISSN
1126-6708
DOI
10.1007/JHEP08(2015)003
language
English
LU publication?
yes
id
8315e88d-becf-4d20-bcee-9bc9f5fb804f (old id 7975901)
date added to LUP
2015-09-24 14:31:06
date last changed
2017-08-06 03:04:45
@article{8315e88d-becf-4d20-bcee-9bc9f5fb804f,
  abstract     = {We present a new model for the hadronisation of multi-parton systems, in which colour correlations beyond leading N-C are allowed to influence the formation of confining potentials (strings). The multiplet structure of SU(3) is combined with a minimisation of the string potential energy, to decide between which partons strings should form, allowing also for "baryonic" configurations (e.g., two colours can combine coherently to form an anticolour). In e(+)e (-) collisions, modifications to the leading-colour picture are small, suppressed by both colour and kinematics factors. But in pp collisions, multi-parton interactions increase the number of possible subleading connections, counteracting their naive 1/N-C(2) suppression. Moreover, those that reduce the overall string lengths are kine-matically favoured. The model, which we have implemented in the PYTHIA 8 generator, is capable of reaching agreement not only with the important &lt; p perpendicular to &gt;(n(charged)) distribution but also with measured rates (and ratios) of kaons and hyperons, in both ee and pp collisions. Nonetheless, the shape of their p perpendicular to spectra remains challenging to explain.},
  articleno    = {003},
  author       = {Christiansen, Jesper Roy and Skands, Peter Z.},
  issn         = {1126-6708},
  keyword      = {QCD Phenomenology,Monte Carlo Simulations},
  language     = {eng},
  number       = {8},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {String formation beyond leading colour},
  url          = {http://dx.doi.org/10.1007/JHEP08(2015)003},
  year         = {2015},
}