Speaker
Summary
Several aspects of the jet and photon production in pp collisions have
been measured by the ATLAS collaboration. The measurements of the
production cross sections of inclusive, di- and tri-jets, together
with inclusive and di-photons probe the dynamics of QCD and can
constrain the parton proton structure. Ratios of inclusive cross
sections measured at different centre-of-mass energies allow for
reduced experimental and/or theoretical uncertainties.
The cross section for photons produced in association with jets is
also measured as a function of various kinematic variables describing
the photon+jet system. The cross sections are measured and compared to
expectations based on next-to-leading order QCD calculations, as well
as to next-to-leading order Monte Carlo simulations. The measurement
of the dijet azimuthal decorrelations is sensitive to the strong
coupling constant. Measurement of splitting scales in the kt
clustering algorithm using jets from W+jet events provide a way to
investigate jet clustering at different resolution scales. These
measurements constitute precision tests of QCD in a new energy regime
