Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Accéder directement au contenu
Article Dans Une Revue Physics Letters B Année : 2013

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV

E. Abbas
  • Fonction : Auteur
Laurent Aphecetche
Guillaume Batigne
B. Cheynis
B. Erazmus
  • Fonction : Auteur
  • PersonId : 1178907
  • IdRef : 033726485
Magali Estienne
Marie Germain
Maxime Guilbaud
Gines Martinez Garcia
Philippe Pillot
C. Roy
Alexandre Shabetai
Diego Stocco

Résumé

We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, -5.0 < eta < 5.5, and employing a special analysis technique based on collisions arising from LHC 'satellite' bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles Nch = 17165 +/- 772 for the 0-5% most central collisions). From the measured dNch/deta distribution we derive the rapidity density distribution, dNch/dy, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model, which reproduce data well at RHIC energies. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models.

Dates et versions

in2p3-00806582 , version 1 (02-04-2013)

Identifiants

Citer

E. Abbas, Laurent Aphecetche, A. Baldisseri, Guillaume Batigne, I. Belikov, et al.. Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV. Physics Letters B, 2013, 726, pp.610-622. ⟨10.1016/j.physletb.2013.09.022⟩. ⟨in2p3-00806582⟩
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