A Comparison of measured jet cross-sections with QCD calculations for e+ e- annihilation

The cross sections for 2-, 3- and 4-jet production have been determined with the JADE detector, sited on thee + e −-storage ring PETRA. Data at s√=14 , 22, 35 and 44 GeV were compared to twoO(α s 2) QCD calculations. A first analysis was performed with uncorrected data using theO(α s 2) 3-jet matrix element calculation of Ellis, Ross and Terrano and the Lund String Monte Carlo program. In a second analysis the calculation of Kramer and Lampe was compared to corrected data. Both approaches gave a poor description of the data when the square of the momentum transferQ 2=s was used as the scale of the running coupling constant. The description improved when the renormalization scale was adjusted to the process studied. The data ware used to fix the best renormalization scale

A MEASUREMENT OF THE CHARMED QUARK ASYMMETRY IN e+ e- ANNIHILATION

The charmed quark charge asymmetry has been measured at the average centre of mass energy of 35 GeV with the JADE detector at thee + e − storage ring PETRA. Charmed quarks were identified byD *± tagging using the ΔM technique.D *± mesons were reconstructed through their decay intoD 0 mesons resulting in (Kπ) π and (K π π π) π final states. The measured charge asymmetryA=−0.149±0.067 is in agreement with the expectation from the electroweak interference effect in quantum flavour dynamics (QFD)

Measurement of two photon production of ρ0ωρ^0\omega

The reaction γγ→π+π-π+π-π0 has been studied using the JADE detector at PETRA. The cross sections for γγ→ωπ+- and for γγ→ωρ0- are given. We observe no peak in these cross sections in the regionWγγ=1.9–2.0 GeV