Abstract
Underlying event studies and charged particle multiplicities with the ATLAS detector in inelastic p– p collisions at center of mass energy of 900 GeV and 7 TeV are presented. The charged particle density, its dependence on pseudo-rapidity and transverse momentum and its correlation with the average transverse momentum are measured for events with at least two charged particles in the kinematic range | η | < 2.5 and p T > 100 MeV . For Underlying Event studies, the transverse momentum of charged tracks is required to be greater than 500 MeV. The measurements are compared with different Monte Carlo model predictions.
Highlights
The spectrum of charged particles created in proton-proton collisions is an important observable, that provides information about the production mechanism as well as the energy density
The main technique to evaluate the size of their contribution to hard interaction relies on comparisons between the data and predictions from different phenomenological models, usually implemented in Monte Carlo (MC) event generators
The data are compared to various particle level MC predictions
Summary
The spectrum of charged particles created in proton-proton collisions is an important observable, that provides information about the production mechanism as well as the energy density. Thi√s at paper discusses the latest charged particle s = 900 GeV and about 190 μb−1 data at m√ultiplicity measurements done s = 7 TeV [2]. Similar measurements were previously done by ATLAS [3, 4] for events with at least one charged particle with pT > 500 MeV and |η| < 2.5. The track with highest pT in the event (referred to as the “leading” track) is taken as representative of the alignment of the energy flow from the hardest scattering process. This direction is used to isolate regions of η − φ space that are sensitive to different aspects of the UE. The same event, track selection (except pT > 500 MeV) and correction procedure are used for both studies
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