Measurement of the longitudinal and transverse cross-section in e+e- annihilation at sqrt(s)=35-44 GeV
Abstract
An investigation of the polar angle distribution of charged hadrons is presented using data taken by the JADE experiment at the PETRA e+e- collider at centre-of-mass energies of 35 and 44 GeV. From fits to the polar angle distribution the longitudinal, sigmaL, and transverse, sigmaT, cross-section relative to the total hadronic are determined at an average energy scale of 36.6 GeV. The results are sigmaL/sigmatot = 0.067 +/- 0.013, sigmaT/sigmatot = 0.933 -/+ 0.013 where total errors are given and the results are exactly anti-correlated. Using the next-to-leading order QCD prediction for the longitudinal cross-section, the value alphaS(36.6 GeV) = 0.150 +/- 0.025 of the strong coupling constant is obtained in agreement with the world average value of alphaS evolved to an energy scale of 36.6 GeV.
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