Speaker
Gerhard Immanuel Brandt
(Georg-August-Universitaet Goettingen (DE))
Description
The ATLAS Collaboration is engaged in precision measurement
of fundamental Standard Model parameters, e.g. the weak-mixing angle
and the complete set of coefficients that describe the angular
distributions of Drell-Yan production. A measurement of the
forward-backward asymmetry for the neutral current Drell Yan process
is presented and the results are then used to extract a measurement of
the effective weak mixing angle. This measurement shows significant
sensitivity to the uncertainties of the parton density functions of
the proton. The angular distributions of the Drell-Yan lepton pairs
around the Z-boson mass peak probe the underlying QCD dynamic of the
Z-boson production mechanisms. We present a measurement of the
complete set of angular coefficients describing these distributions
using 8 TeV centre-of-mass energy. The measurement is compared with
the theoretical predictions and shows discrimination power between
different approaches of the QCD modeling.