Measurements of event shapes, particle production and their correlations with the ATLAS detector

The evolution of the event shape variables, such as the transverse thrust, thrust minor and transverse sphericity have been studied for minimum bias events as a function of momentum scale. In addition the high-energy pp collisions at the LHC provide unique opportunity to study particle flow and event shapes of the hadronic final state particles. The measurements of production properties of mesons and baryons at sqrt(s)=7 TeV using pp collision data collected with the ATLAS experiment at the LHC are presented and compared to predictions. The measurement of the differential production cross section of the φ(1020)-meson as a function of the transverse momentum and rapidity is presented. In addition the measurement of transverse polarization of Λ and Λ¯ hyperons produced in minimum bias events is presented. The polarization is measured in bins of the transverse momentum and Feynman-x variable and in the experimentally accessible phase space it is found to be consistent with zero, as predicted by the Standard Model. Bose-Einstein correlations provide a unique opportunity for detailed understanding of the space-time geometry of the hadronization region, for determining the size and shape of the source from which particles are emitted and for interpreting of quark confinement effects. The ATLAS collaboration has performed a measurement of Bose-Einstein correlations of the pairs of charged particles in p-p collisions at 900 GeV and 7 TeV up to very high charged-particle multiplicities.