K.J. Foley

The forward time projection chamber in STAR

Two cylindrical forward TPC detectors are described which were constructed to extend the phase space coverage of the STAR experiment to the region 2.5 < |�| < 4.0. For optimal use of the available space and in order to cope with the high track density of central Au+Au collisions at RHIC, a novel design was developed using radial drift in a low diffusion gas. From prototype measurements a 2-track resolution of 1 - 2 mm is expected.

Λ production by 11.6 A GeV/c Au beam on Au target

Abstract We present the first measurement at AGS energies of the rapidity and transverse mass distributions for Λ production with Au beam on Au target. The measurements cover the rapidity region of 2.0–3.2 and transverse momenta of 0.0–1.4 GeV/c. The results are compared with the predictions of two models.

Lambda production by 11.6-A/GeV/c Au beam on Au target

Abstract We present the first measurement at AGS energies of the rapidity and transverse mass distributions for Λ production with Au beam on Au target. The measurements cover the rapidity region of 2.0–3.2 and transverse momenta of 0.0–1.4 GeV/c. The results are compared with the predictions of two models.

Observation of three 2++ resonances in the glueball-enhanced channel π-p → φφn☆

Abstract We present data on 3652 analyzed events of the reaction π - p → φφn at 22 GeV/ c . A partial wave analysis has been performed on the φφ system. The results are well represented by three resonances all with quantum numbers I G J PC = 0 + 2 ++ . The absence of the Okubo-Zweig-Iizuka suppression observed in this reaction, the selection of only three J PC =2 ++ states ( g T , g T′ , and g T ″ ) which comprise virtually all of the cross section, and the large φφn signal over a very different φK + K - n background are all well explained if these states are produced by 1–3 glueballs (i.e. multigluon resonances).

The STAR detector magnet subsystem

We describe the specification and design, construction and mapping of the STAR magnet. Measurements demonstrate that field quality exceeds specifications for uniformity and agrees with design values.

The MPS II drift chamber system

Abstract A description is given of a drift chamber system that has very good resolution and beam rate capabilities in a compact and reasonably priced package.

Rapidity distributions of Ks0's and Λ's produced by 14.6×A GeV/cSi beams on Si and Pb targets

Abstract We present the first measurement at AGS energies of rapidity distributions of K s 0 and Λ production with silicon beams on silicon and lead targets. The measurements cover the rapidity region of 2.0 y K s 0 s and 1.4 y Λ s.

Modular TPCs for relativistic heavy-ion experiments☆

Abstract A description is given of a TPC system that operates in a relativistic heavy-ion beam and yields good track reconstruction efficiency in very-high-multiplicity events. The mechanical construction of the chamber is discussed. A set of custom hybrid circuits are used to build a very compact, cost-effective electronics system mounted directly on the chamber. Results from running in test beams and from preliminary experimental runs are given.

Neutral V production with 14.6 ×A GeV/c silicon beams

Abstract We present the results of a measurement of neutral V production with 14.6 × A GeV/ c Si beams on Au and Cu targets. The Λ and K s 0 yields were measured as a function of negative particle multiplicity. Effective temperatures were determined from an exponential fit to the transverse mass distributions.

Programmable combinational logic trigger system for high energy particle physics experiments

Abstract A fast logic system designed to select predetermined combinations of three hits in three detectors is described. Central to this system is a random access memory IC that was especially designed for this application.