[en] Violations of the Feynman scaling are calculated for the inclusive processes π⁺A→π +- X in the projectile pion fragmentation region for the target nucle ¹H and ¹⁴N in the 5x10³-5x10⁹ GeV energy range. The inclusive spectra at high energies are approximated by linear combinations of the nuclear inclusive spectra obtained for accelerator energies. The scaling violation is due to an energy dependence (at high E) of the n-pomeron jet production probabilities for nucleus A, as predicted by the supercritical pomeron theory

[en] The author discusses a variety of phenomelogical issues related to the possible compositeness of quarks, leptons, Higgs particles and W and Z bosons. Some of the main topics are: Experimental test of compositeness; scales of compositeness; and colored leptons

[en] It is assumed that the E₈ gauge group of the E₈xE₈ heterotic superstring can be broken into SO(10). A model to give the mass relation m_u/m_d = m_c/m_s = m_t/m_b is presented and Kobayashi-Maskawa mixing is discussed. (orig.)

[en] We examine the left-right and azimuthal polarization asymmetries of lepton pairs produced in e⁺e^- and e^-e^- interactions as probes of new physics resulting from E₆ theories. The asymmetries are calculated and compared for the processes e⁺e^- → μ⁺μ^-, e⁺e^- → e⁺e^-, e^-e^- → e^-e^-, and e⁺e^- → L⁺L^- where L is either an E₆ exotic, mirror, or fourth generation heavy lepton. Our results show that lepton polarization asymmetries can be used to easily distinguish different E₆ models among possible new heavy leptons L. (orig.)

[en] The authors consider experimental signatures of models with composite W/sup +-/, Z/sup 0/ and composite quarks and leptons. Properties of the composite Z/sup 0/ are discussed in detail. In addition to the W/sup +-/ and Z/sup 0/, many new composite bosons are expected to appear as distinct, narrow resonances in pp, p-bar p, ep and e-bar e interactions. It is possible that the bosons responsible for the weak interactions are composite. In this report the authors consider the experimental signatures of models of this type. Much of the analysis is model independent, however when a specific model is considered they will use the realistic example. In this model the known fermions are correctly described in terms of light bound states, and the weak interactions are the result of residual strong interactions between their constituents. (The gluons and the photon are elementary particles.) The low-energy (E << G/sub F//sup -1/2/) properties of this composite model agree with those of the standard model, but at higher energies new and different phenomena are predicted. The authors discuss how the predictions of the standard model are modified in models with composite W's and Z and analyze the new physics which can be investigated at present and future accelerators. There are three main topics: modification of mass, and production and decay properties for a composite Z/sup 0/; deviations from the standard model in e/sup +/e/sup -/ collisions below the Z mass; and predictions of a rich spectrum of new heavy particles

[en] This paper gives a presentation of the High Energy Physics research activities in which the experimental group of the National Technical University in Athens is involved. The research activities of the group are concentrated mainly on two experiments: The photoproduction experiment NA14 at the SPS accelerator and the DELPHI experiment at LEP

[en] We report on the Λ_C properties observed with the LEBC-EHS set-up at CERN SPS with 360 GeV/c π^- and 400 GeV/c p beams. The lifetime is (1.2^+0.5_-0.3)x10^-13 s and the mass (2284.7±2.3±0.5) MeV/c². (orig.)

[en] We examine the production and decay of a supersymmetric scalar top t₁ at e⁺e^- colliders such as TRISTAN at KEK, the Stanford Linear Collider, and LEP at CERN, based on supersymmetric models with soft breaking. Existing bounds for supersymmetric particles imply that t₁ in the energy range of these colliders would be lighter than other scalar quarks and than the top quark. We make a careful study of available t₁ decay modes in this scenario. The flavor-changing decay t₁→cgamma is found to proceed through the misalignment of the scalar-quark and quark mixing matrices. If the three-body decay t₁→bl⁺nu is kinematically accessible it dominates the two-body decay. The decay t₁→bνl⁺ is even larger due to different chirality structure, but is likely to suffer from a large phase-space suppression. Four-body decays are negligible. The t₁ pair production cross section including the γ and Z contribution and the left-right mixing is presented

[en] Results of inverse beta-decay ν-bare+p → e⁺+n investigation, conducted at the Rovno NPP reactor, are presented. Absolute cross sections and positron spectrum of this reaction are measured at the distance of 18 m from the reactor center for the first time. Relative measurements of cross sections and stectra are also performed at the distances of 18 and 25 m from the reactor center. Positron spectrum from the reverse beta-decay investigated reaction is presented. Limitations on neutrino oscillation parameters are considered. It is stressed, that neigther cross sections and spectra, measured at the distance of 18 m from the reactor center, nor the relative measurements at the distances of 18 and 25 m demonstrate statistically meaningful neutrino oscillation effect manifestation

[en] Muon-electron universality in prompt neutrino experiments is verified to a confidence level of only 1.5 x 10/sup -4/. If this result is ascribed to the existence of ν/sub e/ to ν/sub x/ (x not equal to μ) oscillations, a fit to the experimental data yields the results Δm/sup 2/ = (364 +- 33) eV/sup 2/ sin/sup 2/(2α) = 0.52 +- 0.10 with a 85% confidence level. The present data are consistent with the identification of ν/sub x/ with the tau neutrino