676 research outputs found
From the ISR to RHIC--measurements of hard-scattering and jets using inclusive single particle production and 2-particle correlations
Hard scattering in p-p collisions, discovered at the CERN ISR in 1972 by the
method of leading particles, proved that the partons of Deeply Inelastic
Scattering strongly interacted with each other. Further ISR measurements
utilizing inclusive single or pairs of hadrons established that high pT
particles are produced from states with two roughly back-to-back jets which are
the result of scattering of constituents of the nucleons as desribed by Quantum
Chromodynamics (QCD), which was developed during the course of these
measurements. These techniques, which are the only practical method to study
hard-scattering and jet phenomena in Au+Au central collisions at RHIC energies,
are reviewed, as an introduction to present RHIC measurements.Comment: To appear in the proceedings of the workshop on Correlations and
Fluctuations in Relativistic Nuclear Collisions, MIT, Cambridge, MA, April
21-23, 2005, 10 pages, 9 figures, Journal of Physics: Conference Proceeding
Charge Particle Multiplicity and Transverse Energy Measurements in Au-Au collisions in PHENIX at RHIC
We present results on charged particle and transverse energy densities
measured at mid-rapidity in Au-Au collisions at sqrt(s_{NN})=200 GeV. The mean
transverse energy per charged particle is derived. The results are presented as
a function of centrality, which is defined by the number of participating
nucleons, and compared to results obtained in Au-Au collisions at
sqrt{s_{NN})=130 GeV. A comparison with calculations from various theoretical
models is performed.Comment: 4 pages, 5 figures. Talk presented at Quark Matter 2002, Nantes,
France, July 18-24, 2002. To appear in the proceedings (Nucl. Phys. A
Event Reconstruction in the PHENIX Central Arm Spectrometers
The central arm spectrometers for the PHENIX experiment at the Relativistic
Heavy Ion Collider have been designed for the optimization of particle
identification in relativistic heavy ion collisions. The spectrometers present
a challenging environment for event reconstruction due to a very high track
multiplicity in a complicated, focusing, magnetic field. In order to meet this
challenge, nine distinct detector types are integrated for charged particle
tracking, momentum reconstruction, and particle identification. The techniques
which have been developed for the task of event reconstruction are described.Comment: Accepted for publication in Nucl. Instrum. A. 34 pages, 23 figure
RHIC polarimetry
Polarimeters were developed to measure the polarization of the proton beam at RHIC in relative scale through the asymmetry measurement of the elastic proton-carbon scattering. Recoil carbon ions with kinetic energy of 400 ≤ E ≤ 900 keV were detected by silicon strip detectors installed at 90° with respect to the beam. The absolute polarization is given by normalizing against another polarimeter implemented at RHIC, namely a polarized hydrogen gas jet polarimeter. In this report, the details of polarization measurements, data analysis, and systematic uncertainties are discussed based on the data taken during ∫s = 200 GeV operation of Run 05 at RHIC
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