Modified Glauber Model and a new interpretation of collective effects in AA and pA at LHC

Andrey Seryakov, Grigory Feofilov

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

1 Scopus citations


The Monte Carlo version of the Modified Glauber Model (MGM) [1] is updated and applied to the analysis of the total multiplicity yields of charged particles in mucleus-nucleus and proton-nucleus collisions in a broad energy range. The MGM takes into account the energy conservation and momentum loss for particle production in each nucleon-nucleon inelastic collision. This is done by introducing a mean fraction of the initial nucleon momentum which is allowed to be lost in each inelastic interaction between nucleons of colliding nuclei. Therefore, the next nucleon-nucleon inelastic collision takes place at a lower energy √s and with the relevant cross-section sinel(√s). Comparison of theMGMcalculations to the available experimental data on mean total multiplicity <Nch > in central nucleus-nucleus collisions from AGS to RHIC energies allows to fit a single model parameter k = 0.35. The same value of k is found to be valid for successful description of the scaling of < Nch > /2Npart with the number of nucleon-participants Npart in Pb-Pb collisions observed in ALICE at the LHC [2]. A considerable reduction of Ncoll is obtained in MGM for the case of nucleus-nucleus collisions at the LHC energy in comparison with the standard Glauber approach, while the number of participants Npart is practically unchanged. In the MGM approach the nucleon stopping phenomenon is observed, that has dramatic effect in case of proton-nucleus collisions. The MGM predicts considerable decrease (by a factor of about 3 for central collisions in comparison with the standard Glauber-based estimates) of the number of participants < Npart >=< Ncoll > +1 in case of pA interactions at the LHC.

Original languageEnglish
Title of host publicationXIth Conference on Quark Confinement and Hadron Spectrum
EditorsNora Brambilla, Sergei Kolevatov, Alexander Andrianov, Victor Kim
PublisherAmerican Institute of Physics
ISBN (Electronic)9780735413481
StatePublished - 22 Jan 2016
Event11th Conference on Quark Confinement and Hadron Spectrum - Saint Petersburg, Russian Federation
Duration: 8 Sep 201412 Sep 2014

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference11th Conference on Quark Confinement and Hadron Spectrum
Country/TerritoryRussian Federation
CitySaint Petersburg

Scopus subject areas

  • Physics and Astronomy(all)


  • Energy loss
  • Glauber model
  • Long-range correlations
  • Monte Carlo model
  • Nucleus-nucleus collisions
  • Proton-nucleus collisions
  • Quark-gluon strings interaction


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