[en] Published in summary form only

[en] We present a detailed analysis of the effect of the gravitational field generated by a small rotating quadrupole on a gravitational wave antenna and we report on the preliminary measurement of this effect on the Explorer 2270 kg cryogenic gravitational wave antenna of the Rome group. The induced signal had an amplitude twenty times larger than the detector noise when the antenna was equipped with an FET amplifier and was easily detected without requiring integration in time. We remark that with this method we were able to make an absolute calibration of a gravitational wave antenna. (orig.)

[en] We extend the superspace treatment of higher derivative supersymmetric Yang-Mills theories, emphasizing the role played by manifest D=10 Lorentz covariance and supersymmetry invariance. As an example, the superspace formulation of the effective action is considered for the massless fields in the open superstring, as well as in the SO(32) and E₈xE₈ superstring theories. We show that there exists a unique modification of the f-tensor supercurrent which can provide the embedding of the O(α'³) string corrections in the slope parameter expansion for the Yang-Mills sector in D=10 superspace. The new correction term is relevant for the understanding of nonperturbative effects. (orig.)

[en] We describe how to apply the unitary approximation to high energy scattering processes which involve the radiation of arbitrarily many photons. We compare our results to calculations of inclusive quantities using leading log resummation techniques well known from QCD. In contrast to the latter method the unitary approximation is also appropriate for differential cross sections. The Monte Carlo implementation of the method is discussed and detailed results are given for the case of radiative Bhabha scattering. (orig.)

[en] We reanalyse the pionic form factor by using perturbative QCD theory and contributions from endpoint regions. We find that the perturbative QCD can be applied to the pionic form factor as Q²>4 GeV² and they become unreliable as Q²≤4 GeV². Therefore the applicability of perturbative QCD to the form factor is questionable only as Q²≤4 GeV². (orig.)

[en] This paper presents an analysis of the multiplicity distributions of charged particles produced in Z⁰ hadronic decays in the DELPHI detector. It is based on a sample of 25 364 events. The average multiplicity is < n_ch>=20.71±0.04(stat)±0.77(syst) and the dispersion D=6.28±0.03(stat)±0.43(syst). The data are compared with the results at lower energies and with the predictions of phenomenological models. The Lund parton shower model describes the data reasonably well. The multiplicity distributions show approximate KNO-scaling. They also show positive forward-backward correlations that are strongest in the central region of rapidity and for particles of opposite charge. (orig.)

[en] Radiative corrections to W pair production in e⁺e^--annihilation are investigated. In an earlier work we discussed only the weak corrections to this process. Here we present the complete calculation including QED corrections. Full agreement with other authors is achieved. We use the helicity formalism for the projection of the S-matrix into invariant amplitudes and study the dependence of cross sections on the Higgs and top masses. Effects due to the choice of the renormalization scheme are considered. (orig.)

[en] The operator-product expansion will be employed to obtain the lowest-order, quark condensate component of both the gluon self-energy and the ρ meson correlation function to all orders in the quark mass parameter. Field-theoretic aspects of the self-energy and correlation function will be considered, and physical effects to the quark condensate upon gluon mass generation will be examined. (orig.)

[en] From a model independent analysis of the panti p differential elastic cross section at √s=53 and 546 GeV we have tried to extract the semi-hard QCD component in the eikonal. Our conclusions are: 1) The hadronic form factor for semi-hard interaction has a radius slightly smaller than the electromagnetic radius, < r²>_SH^1/2=0.66 fm; 2) the total inelastic semi-hard cross section at 546 GeV is σ_SH≅15 mb, not very different from the minijet cross section measured by the UA1 Collaboration. (orig.)

[en] In this paper the BKS kernels of BRST bosonic strings are given. And from the kernels the relationships between geometric quantization and path integral quantization of bosonic strings with BRST symmetry are established. At the classical level, we also prove that the symplectic form in the phase space of bosonic strings is BRST invariant and non-degenerate. (orig.)