Showing papers by "Wolfgang Wagner published in 1985"
TL;DR: Schmidt, R and Wagner, W, 1985 A new form of the equation of state for pure substances and its application to oxygen Fluid Phase Equilibria was presented and expressed analytically in the form of free energy as a function of density and temperature This fundamental equation contains, in addition to pure polynomial and BWR-terms, new exponential functions especially convenient for the critical region.
249 citations
TL;DR: In this paper, the authors studied the decay branching ratios of τ pair events in the reactione+e−→τ+ τ− at a c.m. energy of 34.6 GeV.
Abstract: We have studied 419 τ pair events produced in the reactione+e−→τ+ τ− at a c.m. energy of 34.6 GeV. We measure the cross section and angular distribution, as well as the decay branching ratios. The production characteristics are consistent with the Standard Electroweak Model predictions of γ andZ0 interference. The branching ratios are generally consistent with the τ decaying according to standard weak interaction principles, but we observe somewhat more decays resulting in single charged hadrons plus neutrals than are predicted by present theory.
29 citations
TL;DR: In this paper, the authors measured the differential cross section of the reactione+e−→e−− at a c.m. energy of 34.7 GeV and obtained for the weak neutral current couplings the valuesgv2=0.09×0.06,ga2= 0.038× 0.08.
Abstract: The differential cross section of the reactione+e−→e+e− at a c.m. energy of 34.7 GeV has been measured. The result, together with our previously measurede+e−→α+α− data, are compared with the standard model predictions. We obtain for the weak neutral current couplings the valuesgv2=0.09×0.06,ga2=0.38×0.08. A fit of the Weinberg mixing angle gives the valuegv2=0.09×0.06,ga2=0.038×0.08. The data are also used to set limits on possible deviations from the pointlike structure of leptons. An upper limit for thee+e− coupling to a heavy spin 0 boson is also given.
18 citations
TL;DR: In this paper, high statistics measurements of the energy-energy correlation and its related asymmetry (AEEC) ine+e− annihilation at a c.m. energy of 34.6 GeV were presented.
Abstract: We present high statistics measurements of the energy-energy correlation (EEC) and its related asymmetry (AEEC) ine+e− annihilation at a c.m. energy of 34.6 GeV. We find that the energy dependence as well as the large angle behaviour of the latter are well described by perturbative QCD calculations toOα(s2). Non-perturbative effects are estimated with the help of fragmentation models in which different jet topologies are separated using (ɛ, δ) cuts, and found to be small. The extracted values of\(\Lambda _{\overline {MS} }\) lie between 100 and 300 MeV.
15 citations
TL;DR: In this paper, the PLUTO detector at PETRA has been used to study the leptonic structure function of the real photon using the deep inelastice-γ scattering formalism.
Abstract: The processe
+
e
−→e
+
e
− μ+μ− has been studied using the PLUTO detector at PETRA. The data agree well with QED calculations to order α4. Comparison is also made with the predicted leptonic structure function of the real photon using the deep inelastice-γ scattering formalism.
14 citations
TL;DR: In this paper, a search for the reactionsγγ→ωω and γγ→ρ0ω has been carried out at an averagee+e− CM energy of 34.6 GeV with an integrated luminosity of 45 pb−1.
Abstract: A search for the reactionsγγ→ωω andγγ→ρ0ω has been carried out at an averagee+e− CM energy of 34.6 GeV with an integrated luminosity of 45 pb−1. Upper limits are set for these two channels over the γγ CM Energy range of 1.6 to 2.5 GeV. The cross section is determined for the exclusive channelγγ→π+2π−π0.
10 citations
7 citations
TL;DR: In this article, an experimental study of two jet production by interactions of two quasi-real photons is presented, and the data for production of jets with high transverse momentum squared, p T 2 ≥ 10GeV2, are found to be consistent with the fractionally charged quark-parton model.
Abstract: An experimental study of two jet production by interactions of two quasi-real photons is presented. The data for production of jets with high transverse momentum squared, p
T
2
>10GeV2, are found to be consistent with the fractionally charged quark-parton model. If gauge integer charged quark models are considered, then the gluon mass is less than 5 MeV at the 95% confidence level.
6 citations
Patent•
30 Jul 1985
TL;DR: In this article, an apparatus for the contactless coupling of a suspended part 9, provided with a magnet 12 and located in a housing 6 to a force measuring device outside housing 6 and which is provided with controllable electromagnet 1.
Abstract: The invention relates to an apparatus for the contactless coupling of a suspended part 9, provided with a magnet 12 and located in a housing 6 to a force measuring device outside housing 6 and which is provided with a controllable electromagnet 1. Unlike in known apparatuses of this type, the position change of the suspended part 9 is recorded in absolute terms with respect to housing 6 and used for controlling electromagnet 1. This gives greater freedom in the design of housing 6, which can now be designed for a wider temperature and pressure range than hitherto, because no longer is it necessary to take account of a distance measurement through the housing wall.
3 citations
TL;DR: In this paper, the Sterman-Weinberg 2-jet cross section was measured from the hadron energy flow using the thrust axis to define the axis of the jet cone.
Abstract: The Sterman-Weinberg 2-jet cross section is measured from the hadron energy flow using the thrust axis to define the axis of the jet cone. The results are compared with first order QCD predictions. Deviations due to fragmentation are observed which decrease with increasing center of mass energy. We obtain an upper limit of Λmax≈523 MeV for the QCD scale parameter using a method which is insensitive to the details of the fragmentation. Moments of energy flow are also studied.
2 citations