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Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at √s=7 TeV
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ATLAS Collaboration (Including: Jones, G. (Graham)). (2012) Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at √s=7 TeV. European Physical Journal C, Volume 72 (Number 11). Article number 2211 . doi:10.1140/epjc/s10052-013-2676-3 ISSN 1434-6044.
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Official URL: http://dx.doi.org/10.1140/epjc/s10052-012-2211-y
Abstract
A measurement of event shape variables is presented for large momentum transfer proton-proton collisions using the ATLAS detector at the Large Hadron Collider. Six event shape variables calculated using hadronic jets are studied in inclusive multi-jet events in 35 pb−1 of integrated luminosity at a center-of-mass energy of s√=7 TeV . These measurements are compared to predictions by three Monte Carlo event generators containing leading-logarithmic parton showers matched to leading order matrix elements for 2→2 and 2→n (n=2,…,6) scattering. Measurements of the third-jet resolution parameter, aplanarity, thrust, sphericity, and transverse sphericity are generally well described. The mean value of each event shape variable is evaluated as a function of the average momentum of the two leading jets p T,1 and p T,2, with a mean p T approaching 1 TeV.
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