F. Turkot

Experimental study of the reactions K− +p → π− + Ω+ and K− +p → π− + Y∗ + (1385) at 8 and 16 GeV/c

Abstract Differential cross sections have been measured for K − + p → π − + Ω and K − + p → π − + Y ∗ + (1385) at 8 and 16 GeV/c and at small momentum transfer, using the missing mass spectrometer technique. The cross sections continue to be a factor of two higher than those for the corresponding associated production reactions obtained by line reversal, in disagreement with exchange degeneracy.

Low mass cylindrical multiwire proportional chamber with unambiguous dual coordinate readout

Abstract We have built and tested a cylindrical multiwire proportional chamber with dual coordinate readout from the anode wires. The azimuthal coordinate is obtained in the conventional way, the axial one by charge division with a resolution of Δl / l = 0.4% fwhm. The prototype chamber is 75 cm in diameter and 100 cm high and consists of two thin foil cathodes, two Mylar gas windows and a central anode wire plane with a total mass of 21 mg/cm 2 .

Magnetic multiparticle spectrometer using digitized cylindrical spark chambers

Abstract We describe the construction and performance of the vertex spectrometer in the Multiparticle Argo Spectrometer System (MASS) used at Brookhaven. Nine digitized cylindrical wire spark chambers, surrounding a hydrogen target and operating in a 10 kG magnetic field, detected most charged particles with high efficiency up to multiplicities of 12.

Structure in the differential cross section of the reaction p + p → p + M (M < 2.1 GeV) for ∣t∣ < 0.8 (GeV/c)2 at 29 GeV/c)

Abstract Bubble chamber and spectrometer data are combined to study the differential cross section, d σ d t , of the reaction p + p → p + M for ∣t∣

Search for the Z∗ in π− + p → K− + Z∗ at 6 and 8 GeV/c☆

Abstract We have looked for strangeness +1 baryons, Z ∗ s, in the reaction π − + p → K − + Z ∗ . Peaks at missing masses of about 1590 MeV and 1950 MeV are interpreted as reflections of boson decays and upper limits have been assigned for Z ∗ production.

Design and performance of an on-line wire spark chamber spectrometer for 5 to 30 GeV/c particles☆

Abstract This paper describes the design and performance of a wire spark chamber spectrometer system connected on-line to a PDP-6 computer. The system analyzes particles of 5 to 30 GeV/ c momentum scattered at angles from 0 to 15° with a momentum resolution of 0.5% and an angular resolution of 0.5 mrad. The chambers can be sparked every 1.25 msec and the computer can analyze up to 150 events in the 2 sec between AGS beam spills.

Upper limits on rare two-body processes in K−−p and p̄−p scattering at high energies☆

Abstract A missing mass spectrometer search was made for several two-body, double charge exchange reactions, including backward K −p and pp elastic scattering at 8 and 16 GeV/ c and small momentum transfer. No examples of any of these processes were observed.

Design and performance of the multiparticle argo spectrometer system

Abstract The Multiparticle Argo Spectrometer System, MASS, consists of a magnetic vertex spectrometer, two external trigger spectrometers, an on-line monitoring system and an off-line data analysis chain. The performance of MASS has been evaluated from physics data taken in a study of 28.5 GeV/ c pp collisions covering a large range of transverse momentum.

The on-line satellite/central computer facility of the Multiparticle Argo Spectrometer System

Abstract An on-line satellite/central computer facility has been developed at Brookhaven National Laboratory as part of the Multiparticle Argo Spectrometer System (MASS). This facility, consisting of a PDP-9 and a CDC-6600, has been successfully used in a study of proton-proton interactions at 28.5 GeV/ c .

Charged Multiplicity Associated with Transverse Momentum of a Leading Proton in pp at 28.5 GEV/C

We have measured the mean charged multiplicity nCH as a function of transverse momentum p⊥ of the forward proton in the reaction p + p ⇒ p + MM for five intervals of missing mass MM using our Multiparticle Argo Spectrometer System. We observe an increase of nCH for p⊥ > 1 GeV/c.