... FinlandV. Azzolini, P. Eerola, G. Fedi, M. VoutilainenHelsinki Institute of Physics, Helsinki, FinlandS. Czellar, J. Härkönen, A. Heikkinen, V. Karimäki, R. Kinnunen, M.J. Kortelainen, T. Lampén, ... out UE measurements atcenter -of- mass energies (√s) of 0.9 TeV and 7 TeV us-ing hadronic events (minimum-bias and single-jet triggered)containing a leading track-jet [5, 6] or a leading track[7, ... density [34]inthecalorimeter and tracker originating from additional inelasticpp interactions (pile-up) in the same bunch crossing as theDY interaction.The calculation of ρ takes into account...