QCD and Final State Results from ATLAS

# Inclusive charged particle production with the ATLAS detector The first measurements with the ATLAS detector at the LHC on the properties of proton-proton interactions are presented. The charged-particle density, its dependence on transverse momentum and pseudorapidity, and the relationship between transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range abs(eta)< 2.5 and pT > 500 MeV. The measurements are compared to minimum bias Monte Carlo models and to results from other experiments. # Jet studies with charged particles with the ATLAS detector The precise measurements of reconstructed tracks in inelastic pp interactions as measured with the ATLAS detectorat the LHC allows the study of so called 'track jets'. This analysis makes use of the ATLAS inner tracking detector with a coverage in pseudorapidity of abs(eta)<2.5. This approach is completely independent on information from the calorimeters and thus complements jet measurements using calorimetry. It allows to study the production of jets down to small transverse momenta, probing the emergence of jets in inelastic pp interactions. The status of the reconstruction of jets from tracks and first information on kinematic distributions will be shown. # Jet production with the ATLAS detector The calorimeters of the ATLAS experiments cover the pseudo-rapidity range abs(eta)<4.9 and allow the reconstruction of jets over a wide kinematic range. Using the initial low energy pp inelastic collisions from LHC, this contribution will describe the response of the detector to jets and the observed kinematic distributions. The procedure to calibrate the jet response will be described, as an important step towards cross-section measurements of jet production.