Electron and Photon Performance and Electron p_T Spectrum Measurement with ATLAS in pp Collisions at sqrt(s) = 7 TeV

Scott Snyder, for the ATLAS Collaboration

Published 2010-12-02Version 1

We discuss the early performance of the reconstruction of electrons and photons at ATLAS with a center-of-mass energy of 7 TeV. Using a data sample of about 15 nb^-1, we present a measurement of the transverse momentum distribution of inclusive electrons, as well as an observation of prompt photons and a measurement of the purity of this sample. We also demonstrate the reconstruction of J/psi mesons with a data sample of 78 nb^-1.