CMS Collaboration, Adair, A., Akgun, B., et al.. "Study of hadronic event-shape variables in multijet final states in pp collisions at √s=7 TeV." Journal of High Energy Physics, (2014) http://dx.doi.org/10.1007/JHEP10(2014)087.
Event-shape variables, which are sensitive to perturbative and nonperturbative aspects of quantum chromodynamic (QCD) interactions, are studied in multijet events recorded in proton-proton collisions at √s=7 TeV. Events are selected with at least one jet with transverse momentum p T > 110 GeV and pseudorapidity |η| < 2.4, in a data sample corresponding to integrated luminosities of up to 5 fb−1. The distributions of five event-shape variables in various leading jet p T ranges are compared to predictions from different QCD Monte Carlo event generators.
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