Direct γ and γ-jet measurement capability of ATLAS for Pb+Pb collisions Original Research Article

The ATLAS detector at the LHC is capable of efficiently separating photons and neutral hadrons based on their shower shapes over a wide range in η, ϕ, and ET, either in addition to or instead of isolation cuts. This provides ATLAS with a unique strength for direct photon and γ-jet physics as well as access to the unique capability to measure non-isolated photons from fragmentation or from the medium. We present a first look at the ATLAS direct photon measurement capabilities in Pb+Pb and, for reference, p+p collisions at View the MathML source over the region |η|<2.4