Speaker
Summary
Particle distributions sensitive to the underlying event in
proton-proton collisions have been measured with the ATLAS detector
at the LHC at 7 TeV centre-of-mass energy and compared to theoretical
models. 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. The ATLAS
collaboration has also performed a measurement of Bose-Einstein
correlations of the pairs of charged particles at 900 GeV and 7 TeV pp
collisions. Bose-Einstein correlation parameters are investigated up
to very high charged-particle multiplicities. In addition, the
measurements with the ALFA detector of the elastic, inelastic and
total p-p cross sections sqrt(s)= 7 TeV are presented and compared to
theoretical models.
