CERN Accelerating science

ATLAS Note
Report number	ATLAS-CONF-2010-074
Title	High-pT dijet angular distributions in pp interactions at $\sqrt{s}=$7 TeV measured with the ATLAS detector at the LHC
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Imprint	28 Jul 2010. - 14 p.
In:	35th International Conference on High Energy Physics, Paris, France, 22 - 28 Jul 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	EXOTICS
Abstract	Dijet angular distributions from the first proton-proton collisions at center-of-mass energy $\sqrt{s}=$7 TeV have been measured with the ATLAS detector at the LHC. The data set used for this analysis represents an integrated luminosity of 61 ± 7 nb$^{−1}$, collected from March to July 2010. Dijet angular distributions and occupancy ratio distributions have been measured. Comparisons of these distributions with predictions from QCD show good agreement between data and QCD. A search for quark contact interactions has been performed, showing that they are excluded above a distance scale of 2.3 × 10$^{−4}$ fm with the available data. In addition, the data have been compared to QCD distributions summed with a template for physics beyond the Standard Model, allowing generic limits to be set on non-resonant new physics with isotropic dijet final states. For dijet masses between 520 and 680 GeV a ratio of potential signal over QCD background greater than 8% is excluded at the 95% confidence limit.

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