Measurements of charged particle spectra and nuclear modification factor in p+Pb collisions with the ATLAS detector
2014
Abstract
The ATLAS detector at the LHC obtained the sample of p+Pb data at SQUARE ROOTsNN=5.02TeVwith integrated luminosity of 25nbMINUS SIGN 1, which can be compared to the ppdata obtained by interpolating ppmeasurements at SQUARE ROOTs=2.76TeVand 7TeV. Due to the excellent capabilities of the ATLAS detector, and its stable operation in heavy ion as well as proton-proton physics runs, the data allow measurements of the nuclear modification factor, ratio of heavy ion charged particle spectra divided by ppreference, in different centrality classes over a wide range of rapidity.
The charged particle nuclear modification factor is found to vary significantly as a function of transverse momentum with a stronger dependence in more peripheral collisions.