Speaker
Claire Gwenlan
(Oxford)
Description
We present fits to determine parton distribution functions (PDFs) using top-antitop, inclusive W/Z-boson,
as well as W+ and W− boson production measurements in association with jets from ATLAS, in combination
with deep-inelastic scattering data from HERA. The ATLAS W and Z boson data exhibit sensitivity to
the valence quark distributions and the light quark sea composition, whereas the top-quark pair production
data have sensitivity to the gluon distribution. The impact of the top-antitop production data is
increased by fitting several distributions simultaneously, with the full information on the systematic
and statistical correlations between data points. The parton distribution functions extracted using
W+jets data show an improved determination of the high-x sea-quark densities, while confirming the
unsuppressed strange-quark density at lower x<0.02 found by previous ATLAS analyses.
We also present a measurement of the rapidity and transverse momentum dependence of dijet azimuthal
decorrelations, using the quantity RΔϕ. This quantity specifies the fraction of the inclusive dijet
events in which the azimuthal opening angle of the two jets with the highest transverse momenta is
less than a given value of the parameter Δϕmax. RΔϕ is measured in proton-proton collisions at √s=8 TeV
as a function of the dijet rapidity interval, the event total scalar transverse momentum, and Δϕmax.
The data are used to determine the strong coupling αS and to study its running for momentum transfers
from 260 GeV to above 1.6 Te
Primary author
Claire Gwenlan
(Oxford)