J. Murata

Optical alignment system for the PHENIX muon tracking chambers

Abstract A micron-precision optical alignment system (OASys) for the PHENIX muon tracking chambers is developed. To ensure the required mass resolution of vector meson detection, the relative alignment between three tracking station chambers must be monitored with a precision of 25 μm . The OASys is a straightness monitoring system comprised of a light source, lens and CCD camera, used for determining the initial placement as well as for monitoring the time dependent movement of the chambers on a micron scale.

Construction of the PHENIX south muon arm

Installation of the south PHENIX muon arm was completed in January 2001. The role of the muon arm is to track and identify muons, providing good rejection of pions and kaons. In order to accomplish this, we employ a radial field magnetic spectrometer with precision tracking (muon tracker) followed by a stack of absorber/low resolution tracking layers (muon identifier). We report the design, construction and performance of the muon tracker and the muon identifier.

Beyond the standard model physics at RHIC in polarized pp collision

An polarized hadron collider experiment must have a great discovery potential for a search of physics beyond the standard model. Experimental data of various symmetry tests at RHIC are going to be obtained within a few years. The author developed a simulation tool, studying a sensitivity of hunting contact interaction at RHIC by measuring parity violating spin asymmetries.

Experimental sensitivity of contact interaction at RHIC

One of the most vital tasks of an experiment using a polarized hadron collider in a new energy must be a study of physics beyond standard model(SM). In the past few years, several theoretical articles have been devoted showing that RHIC can reach a similar sensitivity of contact interaction for the TEVATRON, due to its polarized beam. The purpose of the present study is to explore the discovery potential for physics beyond SM, from the experimental perspective. A contact interaction (CI), which originates in interactions between quark- and lepton-sub constituents, is included in PYTHIA. The autor developed a plug-in program “POLBEYOND” for PYTHIA by which helicity-dependent matrix elements and spin asymmetries for Drell-Yan and quark scattering process can be examined. The results on the expected single spin asymmetries at RHIC (s=500u200aGeV with 800u200apb−1) in μ± pair production were obtained for various Λ, a model-independent scale parameter of the CI.