Measurement of C-Parameter and Determinations of alphas from C-Parameter and Jet Broadening at PETRA Energies
P. A. Movilla Fernández, O. Biebel, S. Bethke, the JADE Collaboration
Abstract
e+e- annihilation data recorded by the JADE detector at PETRA were used to measure the C-parameter for the first time at sqrts= 35 and 44 GeV. The distributions were compared to a resummed QCD calculation which recently became available for this observable. % In addition, we applied extended resummed calculations to the heavy and wide jet broadening variables, BT and BW, which now include a proper treatment of the quark recoil against multi-gluon emission with single-logarithmic accuracy. % We further investigated power corrections to the mean values of the observables mentioned above. In this study, we considered all available e+e- data between sqrts= 35 and 172 GeV.
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