Measurement of photon plus jets production and identification of boosted top quarks in pp collisions at the LHC using the ATLAS detector

In this dissertation, two analyses, involving photons, jets and top quarks and performed using data collected by the ATLAS detector, are described. These analyses provide stringent tests of the SM using prompt photons in association with jets and a novel method to identify and reconstruct top quarks with large transverse momentum (boosted tops).