Charged particle production in central S-S collisions at 200 GeV/
c per nucleon has been studied by the WA94 experiment at the CERN-SPS. Particle identification has been provided by the Omega RICH, ...while a silicon telescope in the Omega spectrometer and an array of MultiWire Proportional Chambers have been used to trace particles through the RICH detector. Production ratios and transverse mass spectra for
π
±, K
± and
p(
p)
at central rapidity and
p
T
> 1.3 GeV/
c are presented.
Studies on a 300 k pixel detector telescope Middelkamp, Peter; Antinori, F.; Barberis, D. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1996, Letnik:
377, Številka:
2
Journal Article
Recenzirano
Four silicon pixel detector planes are combined to form a tracking telescope in the lead ion experiment WA97 at CERN with 290 304 sensitive elements each of 75 μm by 500 μm area. An electronic pulse ...processing circuit is associated with each individual sensing element and the response for ionizing particles is binary with an adjustable threshold. The noise rate for a threshold of 6000e
− has been measured to be less than 10
−10. The inefficient area due to malfunctioning pixels is 2.8% of the 120 cm
2. Detector overlaps within one plane have been used to determine the alignment of the components of the plane itself, without need for track reconstruction using external detectors. It is the first time that such a big surface covered with active pixels has been used in a physics experiment. Some aspects concerning inclined particle tracks and time walk have been measured separately in a beam test at the CERN SPS H6 beam.
The WA94 experiment is designed to study the production of strange and multistrange baryons and antibaryons at central rapidity in sulphur-sulphur interactions at 200 GeV/c per nucleon. Particle ...production ratios have been obtained in the kinematic region 1.2 ≤
p
T
≤ 3.0 GeV/
c and 2.5 ≤
y
lab
≤ 3.0, and
m
T
spectra for Λ,
Λ
,
Ξ
− and
Ξ
−
particles are presented. Preliminary results on charged kaon production are also discussed, together with the status of charged particle identification using the Omega RICH.
A silicon pixel telescope, consisting of seven planes for a total of about 0.5 M sensor elements with size of 75
μm × 500
μm, was successfully employed in the WA97 experiment at CERN. We describe ...here the overall performance of the detector; we also report some early results from PbPb and p-Pb runs, showing the powerful capability to measure particle momenta and the effective mass of hyperons with a good resolution.
