Forward-backward correlations and event shapes as probes of minimum-bias event properties

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Measurements of inclusive observables, such as particle multiplicities and momentum spectra, have already delivered important information on soft-inclusive ("minimum-bias") physics at the Large Hadron Collider. In order to gain a more complete understanding, however, it is necessary to include also observables that probe the structure of the studied events. We argue that forward-backward (FB) correlations and event-shape observables may be particulary useful first steps in this respect. We study the sensitivity of several different types of FB correlations and two event shape variables - transverse thrust and transverse thrust minor - to various sources of theoretical uncertainty: multiple parton interactions, parton showers, colour (re)connections, and hadronization. The power of each observable to furnish constraints on Monte Carlo models is illustrated by including comparisons between several recent, and qualitatively different, PYTHIA 6 tunes, for pp collisions at √s = 900 GeV.

Original languageEnglish
Article number1628
Pages (from-to)1-13
Number of pages13
JournalEuropean Physical Journal C
Issue number5
Publication statusPublished - 2011
Externally publishedYes


  • Event generators
  • Forward-backward correlations
  • Inelastic hadron-hadron collisions
  • Minimum bias
  • Multiple parton interactions
  • PYTHIA tunes
  • Transverse thrust

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