Properties and internal structure of jets produced in soft proton-proton collisions at √s = 900 GeV

Preliminary results are presented on the study of charged tracks in jets and the internal jet structure using a sample of proton-proton collisions at a center-of-mass energy of √s = 900 GeV collected by the ATLAS detector. Jets with low transverse momenta ( p jet T ) are constructed using the anti−kt jet algorithm with R = 0.6, and selected with uncorrected transverse momentum p jet T > 7 GeV. The track multiplicity and momentum distribution within jets can be exploited to improve jet calibration and is found to be in good agreement with predictions from Monte Carlo simulations. Jet shape measurements are also reasonably well described by the Monte Carlo simulation.