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Effects of overlapping strings in pp collisions

  • Regular Article - Theoretical Physics
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  • Published: 26 March 2015
  • Volume 2015, article number 148, (2015)
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Effects of overlapping strings in pp collisions
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  • Christian Bierlich1,
  • Gösta Gustafson1,
  • Leif Lönnblad1 &
  • …
  • Andrey Tarasov2 

  • 1032 Accesses

  • 143 Citations

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A preprint version of the article is available at arXiv.

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.

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  1. Dept. of Astronomy and Theoretical Physics, Lund University, Sölvegatan 14A, Lund, Sweden

    Christian Bierlich, Gösta Gustafson & Leif Lönnblad

  2. Theory Center, Jefferson Lab, Newport News, Virginia, U.S.A.

    Andrey Tarasov

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  1. Christian Bierlich
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Correspondence to Christian Bierlich.

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ArXiv ePrint: 1412.6259

Work supported in part by the MCnetITN FP7 Marie Curie Initial Training Network, contract PITNGA-2012-315877, the Swedish Research Council (contracts 621-2012-2283 and 621-2013-4287), and contract DE-AC05-06OR23177 under which the Jefferson Science Associates, LLC operates the Thomas Jefferson National Accelerator Facility.

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Bierlich, C., Gustafson, G., Lönnblad, L. et al. Effects of overlapping strings in pp collisions. J. High Energ. Phys. 2015, 148 (2015). https://doi.org/10.1007/JHEP03(2015)148

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  • Received: 23 December 2014

  • Accepted: 02 March 2015

  • Published: 26 March 2015

  • DOI: https://doi.org/10.1007/JHEP03(2015)148

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Keywords

  • QCD Phenomenology
  • Monte Carlo Simulations
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