Speaker
Dr
Frederik Ruehr
(Heidelberg KIP)
Description
Making use of the excellent calorimetry of the ATLAS experiment, measurements of the
cross-section for jet production and of jet properties in proton-proton interactions
at sqrt(s) = 7 TeV will be presented. The corrected and unfolded inclusive cross-section
for high-pT jets will be described, together with the cross-section as a function of the
invariant di-jet mass. Special emphasis will be given to the discussion of the initial
understanding of the jet energy scale. Furthermore, the corrected distribution of the angular
difference between the two leading jets will be shown, both for the azimuthal as well as
for the polar angle. Also studies of the shape of the observed jets will be presented.
All results will be compared to theoretical predictions.
The dijet angular distributions in bins of dijet invariant mass are analyzed with the first $7$~TeV $pp$ collisions recorded with the ATLAS detector.
The data are confronted with Standard Model predictions with the goal of searching for new phenomena: contact interactions and gravitationally mediated
effects and extra dimension models
The measurement of the properties of proton-proton interactions at center-of-mass
energies ranging from 900 GeV (injection energy) to 7 TeV in the ATLAS detector are
presented for a well defined kinematic region. Using charged particles (unfolded and
corrected from observed tracks for detector effects), spectra in transverse momentum,
pseudo-rapidity and particle density are studied both in an inclusive manner as well
as for identified particles, such as Ks and Lambda. In addition, the momentum flow with
respect to a high pT reference track is investigated to study the transition to the
underlying event in high pT collisions. Using charged particles allows also to study
the kinematic properties of jets built from tracks. The results are compared to Monte
Carlo models and have been used to derive Monte Carlo tunes using the first ATLAS
measurements from LHC to constrain model parameters.
Primary author
Dr
Frederik Ruehr
(Heidelberg KIP)
