| Document(s) |
Web Page
Phys. Rev. D 83, 112007 (2011)
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| Contact(s) |
Andrey Korytov, Sergo Jindariani, and Lester Pinera
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| Abstract |
We present a study of event shape variables in p p-bar collisions at center-of-mass energy 1.96 TeV.
The observables studied are the transverse thrust and thrust minor, both defined over final state
momenta perpendicular to the beam direction. The observables are measured using unclustered calorimeter
energy. In addition to studies of the differential distributions, we present the evolution of event
shape mean values as a function of the leading jet transverse energy. Data is compared to theoretical
predictions and to PYTHIA Monte Carlo with and without multiple parton interactions. We find that the
presence of an underlying event significantly biases the observables in comparison to the predictions
of pure perturbative QCD. As a result, we construct an auxiliary quantity, a weighted difference of
the mean values of the thrust and thrust minor, which is independent of the underlying event and study
its evolution as a function of the leading jet energy.
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| Comments |
Last Update: June 2010 Dataset: 2 fb-1
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