[en] The reactions π⁺p → π⁺nπ⁺π⁰ and π⁺p → π⁺pπ⁰π⁰ are selected at 15.7 GeV/c incident π⁺ momentum to isolate and study associated production of Δ⁺/N*⁺ baryons and rho⁺ mesons. The data were acquired at the Stanford Linear Accelerator Center 40 inch hybrid bubble chamber facility. A lead-glass wall was added to detect the photons from π⁰ decays. The data sample consisted of 40K two-prong events taken from a total of 666K pictures representing an untriggered sensitivity of 23 events/μbarn. The Δ⁺rho⁺ production mechanism is studied by fitting the decay angular distributions to the spin density matrix element parameters in the Gottfried-Jackson reference frame. The reaction γp → Δ⁺⁺rho^- is studied using a 20 GeV/c linearly polarized backscattered laser beam at the same SLAC detector facility. The data sample consisted of 130K three-prong events representing a sensitivity of 2.4 events/nanobarn. The photoproduction of Δ⁺⁺rho^- is studied to determine the feasibility of using this reaction in conjunction with π induced Δrho production to measure the radiative width of the rho vector meson. The reactions ^-+p → x⁺pX⁰ and π⁺p → x⁺px⁺x^-X⁰ are studied at 15.7 GeV/c in a search for new, long-lived, neutral, particles. No evidence is found for any new particles and upper limits of 0.53 mbarns and 0.26 mbarns respectively are placed on their production cross sections

[en] The construction and operation of a 2 m long cylindrical drift chamber used as a high-multiplicity charged-particle detector at the Fermilab Tevatron collider is presented. The chamber was constructed of low-mass carbon fibe-epoxy composite material and presents 0.014 interaction lengths of material to particles passing radially through it. A 24-layer 'jet'-type drift cell was used which obtained a spatial resolution of 250 μm and a two-hit separation of 3 mm. The chamber reconstructed events containing more than 100 charged particles over approximately 3.4 units of pseudorapidity. (orig.)

[en] E-735 is designed to study charged particle production in the central region of rapidity in proton-antiproton collisions at √s = 1.8 TeV. Variations in transverse momentum and particle production ratios versus particle density are measured as a possible signature for a quark-gluon-plasma (QGP) phase transition. Preliminary results from the 1987 run are presented. (orig.)

[en] The transverse momentum of charged mesons and anti p's produced within the pseudorapidity range of η=-0.36 to η=+1.0 and azimuthal range of φ=+2deg to φ=+18deg has been measured in anti pp collisions at √s=1.8 TeV. The charged multiplicity of each event was measured by either the 240 element cylindrical hodoscope covering the range -3.25<η<+3.25 or the central drift chamber, which spans a pseudorapidity range of 3.2 units. The average transverse momentum as a function of the pseudorapidity density for mass-identified particles is presented. We have observed pseudorapidity densities as high as 30 particles per unit pseudorapidity. (orig.)

[en] We present a survey of the recent results of E-735 in its search for QGP signals at the Fermilab Collider. The basic data are the inclusive P_t distributions of centrally produced π, K, anti p and Λ⁰ as a function of total charged multiplicity in the collision; the variation of [P_t] and particle ratios are derived. Preliminary results on π-π correlations and inclusive photon production are also presented. (orig.)

[en] Experiment E735 collected data for ∼10⁷ interactions at the C0 intersection of the Fermilab p bar p collider with √s =1.8 TeV. The Bose-Einstein correlations between pairs of identical pions were measured in a limited aperture spectrometer and used to estimate the size and lifetime of the source. The aperture shape limited the sensitivity primarily to the source dimension R along the incident p bar p direction. Both this dimension and the lifetime appear to depend strongly on pion multiplicity. Efforts were also made to obtain some information on the transverse source size, energy density, and the dependence of source size and strength on dipion momentum. Fits to the entire data sample yielded a value R=1.06±0.07 fm for the average source dimension and a value τ=0.74±0.06 fm for the average source lifetime with left-angle dN_c/dη right-angle=14.4