A new measurement of cosmic-ray electrons and positrons with the Large Area Telescope

We present an updated measurement of the cosmic-ray electron and positron spectrum between 7~GeV and 2~TeV, based on 7 years of data collected with the Fermi Large Area Telescope (LAT). The LAT is the first space-based instrument to directly explore the region above 1~TeV. At such high energies, the shape of the spectrum can provide useful information about the origin and propagation of cosmic-ray electrons in the nearby Galactic space. The best fit to the spectrum that we measure is given by a broken power-law, with the break located at 53 $\pm$8~GeV. Such break, however, is not significant when all the systematic uncertainties are taken into account. Above 50 GeV our data are well described by a single power law with a spectral index of 3.07 $\pm$ 0.02 (stat + syst) $\pm$ 0.06 (energy scale). An exponential cut-off lower than 1.7~TeV is excluded at 95\% CL.