Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at root s=7 TeV
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CitationAad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A.A., Abdinov O. ... ATLAS Collaboration. (2012). Measurement of event shapes at large momentum transfer with the ATLAS detector in pp collisions at root s=7 TeV. European Physical Journal C, 72 (11), 22p. http://dx.doi.org/10.1140/epjc/s10052-012-2211-y.
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 root 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.