A Measurement of the Azimuthal Decorrelation in Di-jet Events in Proton-proton Collisions at √s = 7 TeV at the Large Hadron Collider

• Main Author: Rosenbaum, Gabriel
• Other Authors: Krieger, Peter
• Language: en_ca
• Published: 2011
• Subjects: azimuthal decorrelation; lhc; atlas; qcd; delta phi; 0798
• Online Access: http://hdl.handle.net/1807/29851

A measurement of the azimuthal decorrelation in di-jet events in proton-proton collisions at $\sqrt{s}= 7\,$TeV is presented. Using $19.6\,$nb$^{-1}$ of data collected in the ATLAS detector this measurement uses the angle ($\Delta\phi$) in the transverse plane between the two leading $p_T$ jets to measure the normalized differential cross section $\frac{1}{\sigma_{tot}}\frac{d\sigma}{d(\Delta\phi)}$. An unfolding correction is a applied to give a jet-level result. The unfolded spectrum is compared to the predictions of two Monte Carlo event generators: Pythia and Herwig++.