TY  - GEN
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/15353/
KW  - dijet angular distributions qcd quantum black holes compositeness quark substructure atlas lhc
A1  - Dietzsch, Thorsten
AV  - public
ID  - heidok15353
N2  - The high-energy proton-proton collisions at the LHC allow to probe hard QCD interactions at the highest momentum transfers and to search for physics beyond the Standard Model. Normalised dijet angular distributions are particularly suited for such searches due to their reduced sensitivity to systematic uncertainties. In this thesis, 4.8 fb-1 of proton-proton collisions at sqrt(s) = 7 TeV, recorded with the ATLAS detector, are used to measure the dijet angular distributions in five bins of the dijet invariant mass. The data are compared to a QCD prediction which is obtained from Monte Carlo simulations and corrected for NLO effects. In the absence of significant deviations from the background prediction, 95% C.L. Bayesian limits are set on the characteristic parameters of two models for new phenomena. In a quark contact interaction scenario with destructive interference, the compositeness scale Lambda is excluded below 7.6 TeV, while the expected limit was 7.7 TeV. A quantum black hole model with six extra dimensions is excluded for values of the reduced Planck scale M_D below 4.1 TeV, with an expected limit at 4.2 TeV.
TI  - Search for New Phenomena in Dijet Angular Distributions Measured with the ATLAS Detector in Proton-Proton Collisions at sqrt(s) = 7 TeV
Y1  - 2013///
ER  -