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| Home > Publications database > Measurement of the centrality dependence of the charged particle pseudorapidity distribution in proton-lead collisions at $\sqrt{s_{NN}} = 5.02$ TeV with the ATLAS detector |
| Home > Publications database > Measurement of the centrality dependence of the charged particle pseudorapidity distribution in proton-lead collisions at $\sqrt{s_{NN}} = 5.02$ TeV with the ATLAS detector |
| Preprint/Internal Report | DESY-2013-00780 |
2013
Report No.: ATLAS-CONF-2013-096
Abstract: The ATLAS experiment at the LHC has measured the centrality dependence of chargedparticle pseudorapidity distributions, dNch=d, in p+Pb collisions at a nucleon-nucleoncentre-of-mass energy of psNN = 5:02 TeV. Charged particles were reconstructed overjj < 2:7 using the ATLAS pixel detector. The proton-lead collision centrality was characterizedby the total transverse energy measured over the pseudorapidity interval 3:2 < < 4:9in the direction of the lead beam. The dNch=d distributions are found to vary strongly withcentrality, with an increasing asymmetry between the proton-going and Pb-going directionsas the collisions become more central. Three dierent calculations of the number of participants,Npart, have been carried out using a standard Glauber model as well as two Glauber-Gribov extensions. Charged particle multiplicities per participant pair, dNch=d=(hNparti=2),are found to vary dierently with Npart for these three models, pointing to the importanceof the fluctuating nature of nucleon-nucleon collisions in the modeling of the initial state ofp+Pb collisions.c
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