R. Ely

Intermediate silicon layers detector for the CDF experiment

Abstract The Intermediate Silicon Layers (ISL) detector is currently being built as part of the CDF II detector upgrade project. The ISL detector will significantly improve tracking in the central region and, together with the Silicon Vertex detector, provide stand-alone 3D track information in the forward/backward regions. In this article, we present the quality of the production sensors manufactured by Hamamatsu Photonics, which account for roughly half of the silicon sensors used in the ISL detector.

The SVX3D integrated circuit for dead-timeless silicon strip readout

Abstract The revision D of the SVX3 readout IC has been fabricated in the Honeywell radiation-hard 0.8 μm bulk CMOS process, for instrumenting 712,704 silicon strips in the upgrade to the Collider Detector at Fermilab. This final revision incorporates new features and changes to the original architecture that were added to meet the goal of dead-timeless operation. This paper describes the features central to dead-timeless operation, and presents test data for un-irradiated and irradiated SVX3D chips.

Search for highly-interacting, fractionally-charged particles in electron-positron annihilation at 29 GeV☆

Abstract We have searched for relativistic, highly-interacting fractionally-charged particles using the free-quark detector at the e + e − storage ring PEP. No convincing events were seen. For an assumed interaction cross section with matter of 100 times geometric, 90% confidence level upper limits on their production relative to e + e − → μ + μ − are between 0.025 and 0.49 depending on quark mass (up to 13 GeV/ c 2 ) and reaction type. These are the first published limits on the production of fractionally charged particles with interaction cross sections of 100 times geometric or larger.

The CDF silicon vertex detector: an overview and test results

The final design and construction of a 46080 channel silicon microstrip vertex detector (SVX) for the Collider Detector Facility (CDF) experiment at the Tevatron collider are described. The system performance of the front end electronics employing a custom VLSI readout chip and the mechanical support and cooling systems for the 0.7 m/sup 2/ silicon detector are discussed. The authors present performance results from initial testing of individual components through final testing of the full system of detectors, readout, cooling, and data acquisition. Preliminary results from cosmic ray triggered data are also described.<<ETX>>

An inclusive search for free quarks at PEP

Abstract We report the results of a search for fractionally charged particles in e + e − reactions at a center of mass energy of 29 GeV. We find no evidence for such particles and present upper limitts on R q = σ q q X/σ μμ for change 1 3 e and 2 3 e which range from 1 to 8 × 10 −2 for mass up to 12 GeV/ c 2 .

INCLUSIVE PRODUCTION OF D AND K MESONS IN e-e+ ANNIHILATION

Abstract We present measurements of the cross section for inclusive D and K meson production in e+e− annihilation in the center of mass energy range 3.6 to 5.8 GeV. D production accounts for most of the increase in the total cross section for hadron production in e+e− annihilation at energies above 4 GeV.

The CDF intermediate silicon layers detector

The Intermediate Silicon Layers detector (ISL) was proposed as a part of the upgraded CDF detector at the RUN-II of the Tevatron pp Collider at Fermilab, scheduled to start in year 2000. The ISL is a large-radius (20–30 cm) silicon tracker with a total active area of about 3.5 m2. Locatedin the region between the Silicon Vertex Detector (SVX II) andthe Central Outer Tracker, the ISL will allow tracking in the forwardregion andsignificantly improve it in the central area. Together with the SVX II the ISL forms a standalone, 3D silicon tracker. The challenge is to build a low-cost device which provides precise 3D tracking in a = 2 m long area with a minimal amount of material for the supporting structure. The conceptual design and the status of the project are reviewed.

Two-jet invariant 0 mass distribution at √s=1.8 TeV

We present the dijet invariant-mass distribution in the region between 60 and 500 GeV, measured in 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. Jets are restricted to the pseudorapidity interval {vert bar}{eta}{vert bar}{lt}0.7. Data are compared with QCD calculations; axigluons are excluded with 95% confidence in the region 120{lt}{ital M}{sub {ital A}}{lt}210 GeV for axigluon width {Gamma}{sub {ital A}}={ital N}{alpha}{sub s}{ital M}{sub {ital A}}/6, with {ital N}=5.