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

TL;DR

This paper reports on the early performance of electron and photon reconstruction at ATLAS during 7 TeV proton-proton collisions, including measurements of electron p_T spectra, prompt photons, and J/psi mesons, demonstrating detector capabilities.

Contribution

It provides initial performance metrics and measurements of electrons, photons, and J/psi mesons at 7 TeV, showcasing ATLAS detector capabilities in early data.

Findings

Successful reconstruction of electrons and photons at 7 TeV

Measurement of electron transverse momentum spectrum

Observation of prompt photons and J/psi mesons

Abstract

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.