Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1835827 | Nuclear Physics A | 2014 | 8 Pages |
Abstract
The ATLAS experiment at the LHC has measured the centrality dependence of charged-particle pseudorapidity distribution, charged-particle spectra, and two-particle correlations in p+Pb collisions at a nucleon-nucleon centre-of-mass energy of sNN=5.02 TeV. Charged particles were measured over |η|<2.7 using the ATLAS detector tracking system. The p+Pb collision centrality was characterised by the total transverse energy deposited over the interval 3.2<η<4.9 in the direction of the Pb-beam. Three different calculations of the number of participating nucleons have been carried out using a standard Glauber initial-state model as well as two Glauber-Gribov extensions. Charged-particle multiplicities per participant pair, and the normalised charged-particle spectra are found to vary in shape with η and also with the model, pointing to the importance of the fluctuating nature of nucleon-nucleon collisions in the modelling of the initial state of p+Pb collisions. The two-particle correlation exhibits flow-like modulations for all centrality intervals and particle pT.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Alexander Milov, ATLAS Collaboration ATLAS Collaboration,