No abstract available

No abstract available

No abstract available

No abstract available

[en] The results of elastic K^-p scattering at 32.1 GeV/c are presented for the t range of 0.045<|t|<1.75 GeV² (where t is the squared four-momentum transfer) with statistics of 6.5 events/microbarn. The diffeKential cross section dσsub(l)/dt has been parametrized with the dependences Aexp(at), Aexp(at+βt²), Aexp(at)+Bexp(ct). The data have been analysed in the impact parameter representation. The overlap functions and mean square interaction distances have been found for elastic and inelastic processes. The results obtained confirm that inelastic processes are greatly pheripheral with respect to elastic ones. The ratio of the total cross sections for head-on pp- and K^-p-collisions is shown to differ very little from 3/2, which coincides with the conclusions of simple additive quark models. However this agreement is broken with growth of peripherality. The decrease of the cross section for K^-p-scattering observed up to s< or approximately 60 GeV (S - total energy squared) takes place mainly due to the decrease of the overlap function at small impact parameters, i.e. due to smaller opaqueness at central collisions. The experimental results contradict the hypothesis of the geometial scaling and eiconal factorization at s< or approximately 60 GeV². In the framework of model predictions the hadronic matter density distribution in proton and K^--meson has been estimated

[en] A brief review of selected directions in medium energy physics is given. Special attention is paid to the propagation of hadrons in the nuclear medium which results in a modification of the free properties of the probe hadron and the nucleus. Such modifications are germane to our understanding of both particles and nuclei. Examples are given involving pion and kaon scattering, absorption and production from nuclei. Some of what has been learned is summarized and some of the hopes for the future are outlined

[en] Production of proton-antiproton pairs by two photon scattering has been observed at the electron-positron storage ring PETRA. A total of eight proton-antiproton pairs have been identified using the time-of-flight technique. We have measured a total cross section of 4.5 +- 1.6 +- 0.8 nb in the photon-photon c.m. energy range 2.0-2.6 GeV. (orig.)

[en] This paper gives a report of a photoproduction experiment of proton-antiproton pairs on hydrogen in the elastic reaction γp → panti pp which was performed at the Deutsches Elektronensynchrotron in Hamburg. The results of our measurements do not show substantial energy dependence in the energy range in our experiment. We obtain an integrated cross section of 79.6 +- 6 nbarn for the investigated reaction. Data accumulations could be observed in the invariant mass distribution of the proton antiproton pairs at 1940 MeV/c² and 2020 MeV/c². The signal at 2020 MeV/c² has a statistical significance of 3.5 standard deviations and is in agreement with a resonance of the panti p-system reported in earlier experiments, a Breit-Wigner fit to the data yielded for mass msub(o) and width GAMMAsub(o) of this signal m₀ = 2.023 +- .005 GeV/c² GAMMA₀ = 27 +- 12 MeV/c². (orig./HSI)

[en] The production of rho⁰, ω and f resonances is studied in multinucleon interactions of π^- mesons with ¹²C at P=40 GeV/c. It has been found, that the cross sections for rho⁰- and ω-meson production are σ(rho⁰)=21.7+-4.6 mb and σ(ω)=19.7+-5.6 mb while σ(f)=7.2+-3.0 mb. Data on average multiplicities of rho⁰-mesons are analysed within the framework of basic diagrams of the additive-quark model. It has been shown that in the π^-2C reaction the contribution of interactions of two quarks of incident π^-mesons is about 20% and 60% in multinucleon interactions, respectively

[en] The aim of this thesis was the measurement of the component Asub(yy) of the spin correlation tensor for proton-proton scattering at a center-of-mass angle intersection(cm) = 90⁰. The mean scattering energy was Esub(Lab) = 9.57 +- 0.11 MeV. From the measurements for the spin correlation coefficient Asub(yy) the value Asub(yy) (90⁰, 9.57 MeV) = -0.978 +- 0.012 was derived. A scattering phase analysis of measurements of the cross sections, the analyzing power, and the value Asub(y) determined in this thesis was performed at the energy 9.92 MeV. (orig./HSI)