[en] The SU(6) x O(3) classification of baryons is applied to the hyperon production in the framwork of the quark-diquark fusion model. The model predictions are compared with the data measured in pp interactions at various energies. The contribution of the decay of the high-lying hyperon resonances to the observed spectra is estimated and found essential. (orig.)

[en] The SU(6) x o(3) classification of baryons is applied to the hyperon production in the framework of the quark-diquark fusion model. The model predictions are compared with the data measured in pp interactions at various energies. The contribution of the decay of the high-lying hyperon reasonances to the observed spectra is estimated and found essential. (orig.)

[en] Progress in correlation studies makes it obvious that a real understanding of the phenomena responsible for the structure observed in correlations is impossible without precise separation of the production mechanisms playing a dominant role in different regions of the phase space. For this reason the paper is devoted to those results which provide information about the interplay between the correlation and production dynamics. The presented data support the existence of the positive short-range correlations in rapidity space for both like and unlike charge combination. The dependence of the semiinclusive correlation function can be parametrized in the framework of the independent cluster emission model with cluster multiplicity (K)(<=) 2 which means that the resonance can play a dominant role in the longitudinal correlations. The angular correlations observed in the ππ systems are mainly of the kinematical origin. The difference between the like and unlike charge pairs apart from the threshold region where the interference effects could be essential can be explained by the resonance production

[en] The authors determined the energy and coordinate resolution of nonsegmented layered uranium calorimeters with scintillator cross-sections of 40 x 20 and 15 x 15 cm. The experimental data are compared with the results of a computer simulation by the GEANT3.13 program. The results are in good agreement with analytical predictions for a calorimeter with uranium plate thicknesses of 0.5 and 0.2 cm. The energy resolution for electrons with a momentum of 26.6 GeV/c amounts to 4.8 and 3.0 ± 0.05%, respectively; the accuracy of the input-coordinate measurement of a primary particle is better than 1 cm. It was concluded that nonsegmented calorimeters with large cross-sections can be used in physical experiments

[en] This paper describes a hadron calorimeter prototype with cylindrical compressed-gas ionization chambers. The noise characteristics in two modes of analog signal adding are compared. The calorimeter's energy resolution under pion beams with momenta of 312, 43, and 56 GeV/c was measured. The coordinate resolution under the 56-GeV/c pion beam was evaluated. The paper outlines ways to improve the device to suit a collider experiment

[en] A remarkable result has emerged from the first several years of data taking at RHIC--the high temperature and density phase of QCD matter created in heavy ion collisions at RHIC is best described as a near perfect fluid--the strongly interacting Quark-Gluon-Plasma (sQGP). This state is characterized by a small viscosity to entropy ratio, and a high density of color charges which induces huge energy losses of partons transversing the medium. The task for the future is to understand the characteristics of the sQGP, and perhaps more importantly--to gain some insight into how and why such a medium is created. The PHENIX detector has been one of the primary experimental tools at RHIC; in particular the electromagnetic calorimeter has been a critical component of many of the measurements leading to this discovery. The coverage of the present PHENIX electromagnetic calorimeter is rather limited, covering half the azimuth and -0.35< η <0.35 Further progress requires larger coverage of electromagnetic calorimetry, both to increase the rate for low cross section phenomena, and to cover a broader range of pseudorapidity to study the rapidity dependence of the medium. A pair of Nosecone Calorimeters (NCC) has been designed covering both positive and negative rapidity regions 1< |η| <3 of the PHENIX detector. The NCC will make it possible to perform tomographic studies of the jet energy dependence of energy loss and medium response, by using direct photons as trigger particles over a large rapidity range. The technique of correlating trigger hadrons with low momentum hadrons has been powerfully exploited at RHIC to study the evolution of back to back jets [1, 2] and hence the response of the medium. The NCC will make it possible to do such studies using direct photons as the trigger particles. The direct photon in such ''photon-jet'' events tags the transverse momentum of outgoing parton which then fragments into lower energy particles. Together with the Forward Silicon Vertex detector (FVTX), the NCC will make PHENIX a large acceptance spectrometer, capable of detecting photons, electrons, muons, and hadrons. Our prime motivation is to provide precision measurements of direct photons, π⁰s and dielectrons in A+A, p(d)+A, and polarized p+p collisions. The upgrade will provide access to physics observables that are not currently accessible to PHENIX or that are now available only indirectly with very limited accuracy

[en] The data on < nsub(π^-)>, < nsub(π⁺)> associated with a given transverse momentum of a π^- are obtained in pp collisions at 69GeV/c in the 4.5m bubble chamber Mirabelle at Serpukhov. Dependences of < nsub(π^-)>, < nsub(π⁺)> on transverse momentum, azimuthal angle and rapidity separation are studied. The data confirm the difference between the systems π⁺π^- and π^-π^- in the azimuthal correlations

[en] The general features of anti pp interactions at 32 GeV/c are analysed in a bubble chamber experiment with a statistics of 5.2 μb/event. The inclusive production of neutral strange particles and pions is analysed and compared to results at other energies and in pp interactions. Total cross sections are determined for various 4C reactions and the relative contributions of diffractive dissociation and anti ΔΔ production to the reaction anti pp→anti ppπ⁺π^- are estimated. (Auth.)

[en] The inclusive and semi-inclusive production of protons, πsup(+), πsup(-), are presented for the full range of kinematic variables, from 7850 inelastic interactions obtained in the 4.7m liquid-hydrogen bubble chamber Mirabelle at the Serpukhov accelerator and with an incident proton beam of 69 GeV/c. The data are compared with those at other energies, and the results of different phenomenological fits are given

[en] The main features of the reaction pp→ppπ⁺π^- at 69 Gev/c are investigated from data obtained in the Mirabelle bubble chamber at Serpukhov. A search for a double pomeron exchange mechanism contribution leads to an upper limit of approximately equal to 20 μb for M(π⁺π^-) <= 0.7 GeV under reasonable assumptions. The four-body final state is dominated by proton diffractive dissociation p→pπ⁺π^- (mostly Δ⁺⁺π^-). The cross section for this process, as well as the t production slope and the decay distributions (of the Δ⁺⁺) show little variation in comparison with lower energy data. (Auth.)