Measurement of the Longitudinal Cross-Section using the Direction of the Thrust Axis in Hadronic Events at LEP

Details Measurement of the Longitudinal Cross-Section using the Direction of the Thrust Axis in Hadronic Events at LEP Measurement of the Longitudinal Cross-Section using the Direction of the Thrust Axis in Hadronic Events at LEP

1998-08-30

arxiv.org/abs/hep-ex/9808035v1

Phys.Lett.B440:393-402,1998

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, LaTeX, 4 eps figures and 3 colour eps figs included, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(98)01172-1

In the process e+e- to hadrons, one of the effects of gluon emission is to modify the 1+cos(theta)**2 form of the angular distribution of the thrust axis, an effect which may be quantified by the longitudinal cross-section. Using the OPAL detector at LEP, we have determined the longitudinal to total cross-section ratio to be 0.0127+-0.0016+-0.0013 at the parton level, in good agreement with the expectation of QCD computed to Order(alpha_s**2) Comparisions at the hadron level with Monte Carlo models are presented. The dependence of the longitudinal cross-section on the value of thrust has also been studied, and provides a new test of QCD.

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