[en] In the following recent results from these experiments concerning the gross features of the hadronic final state produced by e⁺e^--annihilation are reported: a) the total cross section for hadron production, b) the energy fractions of charged and neutral hadrons, c) the charged hadron multiplicities, d) inclusive hadron spectra. (orig./HSI)

[en] The central tracking chamber in the JADE detector, the so-called jet chamber, has supplied physicists from the JADE collaboration with a wealth of information on electron-positron collisions at PETRA for more than 6 years. When it was developed by the Heidelberg group, the concept of a 3-dimensional drift chamber which also measured the energy loss of the particles in the chamber gas was a new one. However it has proved its worth and has been copied many times since. (orig.)

No abstract available

[en] In the following recent results from these experiments concerning the gross features of the hadronic final state produced by e⁺e^--annihilation are reported: a) the total cross section for hadron production, b) the energy fractions of charged and neutral hadrons, c) the charged hadron multiplicities, d) inclusive hadron spectra. (orig./HSI)

[en] Recent Results from PEP and PETRA on lepton and hadron production by e⁺e^--annihilation, on the lifetime of bottom hadrons, and on τ-decays are reviewed with special emphasis on tests of the Standard Model

[en] Data on anti p and anti Λ production by e⁺e^--annihilation at CM energies between 30 and 36 GeV are presented. Indication for an angular anticorrelation in events with baryon antibaryon pairs is seen. (orig.)

[en] A search for narrow resonances in e ⁺e^- annihilation between 33.00 and 36.72 GeV is reported. No evidence is found for the existence of such states. The 90% confidence upper limit on the integrated resonance cross section is determined to be 28 nb MeV, a value significantly below that expected for the lowest tanti t bound state. (orig.)

[en] Topological distributions of hadrons from the reaction e⁺e^- → hadrons are studied at center of mass energies of about 33 GeV. The experimental distributions in the parameters acoplanarity and tripodity, both sensitive to events with a four-jet structure, show significant deviations from the expectations for two- and three-jet events. They can be described well by the inclusion of four-jet events. The relative magnitude of the observed effect indicates second order QCD as its probable origin. (orig.)

[en] The processes e⁺ esup(a)nd → e⁺ e^- and μ⁺ μ^- have been studied at PETRA using the JADE detector. The data, which were collected at s values of up to 1300 GeV² have been analysed in terms of an electro-weak extension of QED to obtain values for the weak vector and axial vector couplings in the lepton sector. The values obtained agree with the predictions of the standard Salam-Weinberg model and the data are further analysed in terms of this model to obtain the limits 0.10 < sin²THETAsub(w) 0.40 (68% C.L.). The mass of the neutral weak gauge boson is deduced to be greater than 51 GeVc². (orig.)

[en] Differential 3-jet cross sections have been measured in e⁺e^--annihilation at an average c.m. energy of 33.8 GeV and were compared to 1st and 2nd-order predictions of QCD and of a QED-like Abelian vector theory. QCD provides a good description of the observed distributions. The inclusion of 2nd-order effects reduced the observed quark gluon coupling strength by about 20% to αsub(s) = 0.16 +- 0.015 (stat.) +- 0.03 (system.). The Abelian vector theory is found to be incompatible with the data. (orig.)