9906994
Electroweak Measurements on the Z Resonance
Almost all precision electroweak measurements from the Z resonance made at the LEP storage ring by the ALEPH, DELPHI, L3 and OPAL experiments and those made using a polarized electron beam at the SLC by the SLD experiment are now nal and have been published. Changes in the measurements since the last RADCOR meeting are discussed. The internal consistency of the measurements is considered. The impact of remaining theoretical uncertainties in the QCD sector are examined as well as the impact of experimental and theoretical uncertainties on the value of QED(mZ).
5931713
Fine grained silicon-tungsten calorimetry for a linear collider detector
A fine grained silicon-tungsten calorimeter is ideal for use as the electromagnetic calorimeter in a linear collider detector optimized for particle-flow reconstruction. We are designing a calorimeter that is based on readout chips which are bump bonded to the silicon wafers that serve as the active medium in the calorimeter. By using integrated electronics we plan to demonstrate that fine granularity can be achieved at a reasonable price. Our design minimizes the gap between tungsten layers leading to a small Moliere radius, an important figure of merit for particle-flow detectors. Tests of the silicon detectors to be used in a test beam prototype as well as timing measurements based on similar silicon detectors are discussed.
118911509
Measurement of the Ratio of the Invisible to Leptonic Widths of the Z0 Using the OPAL Detector at LEP
110121625
A prototype silicon preradiator for the SSC
The authors describe the design of and first results from the test of a prototype of a preradiator detector. Such a detector could be used to enhance the identification of photons and electrons at the Superconducting Super Collider (SSC). Specifically, it may be used by the GEM detector to distinguish between single photons from Higgs decay and background photon pairs from pi /sup 0/ decay. The prototype consists of a tungsten radiator followed by silicon strip detectors. Two silicon detectors, oriented in X and Y, consists of 48 strips, each of length 48 mm. The pitch is 1 mm. The readout is achieved by low-noise, low-power custom preamplifier chips mounted directly on the detectors via custom circuit boards. This preradiator was tested in a beam at Brookhaven in July 1992. A lead glass array placed behind the silicon was used to determine energy resolution effects. The results from the test on spatial distributions and energy resolution, including correction of the energy deposited in the preradiator, are presented, along with comparisons to EGS simulations. >
53508605
Development of Readout Interconnections for the Si-W Calorimeter of SiD
The SiD collaboration is developing a Si-W sampling electromagnetic calorimeter, with anticipated application for the International Linear Collider. Assembling the modules for such a detector will involve special bonding technologies for the interconnections, especially for attaching a silicon detector wafer to a flex cable readout bus. We review the interconnect technologies involved, including oxidation removal processes, pad surface preparation, solder ball selection and placement, and bond quality assurance. Our results show that solder ball bonding is a promising technique for the Si-W ECAL, and unresolved issues are being addressed.
118291226
Chronopixel Vertex Detectors for Future Linear Colliders
Over the past few years we have developed, in collaboration with the SARNOFF Corporation, a design of a Monolithic CMOS Pixel Detector for ILC Vertex Detectors. The unique feature of this design is that each hit is accompanied by a time tag with sufficient precision to assign each hit to a particular bunch crossing of the ILC (thus the name Chronopixel). This reduces the occupancy even in the innermost Vertex Detector layer to negligible levels, allowing a robust Vertex Detector even in the case that the backgrounds in the ILC are higher than presently estimated.
117171754
The new D0 layer 0 silicaon detector