L.S. Osborne

DESIGN AND PERFORMANCE OF THE SLD VERTEX DETECTOR : A 307 MPIXEL TRACKING SYSTEM

This paper describes the design, construction, and initial operation of SLDs upgraded vertex detector which comprises 96 two-dimensional charge-coupled devices (CCDs) with a total of 307 Mpixel. Each pixel functions as an independent particle detecting element, providing space point measurements of charged particle tracks with a typical precision of 4 μm in each co-ordinate. The CCDs are arranged in three concentric cylinders just outside the beam-pipe which surrounds the e+e− collision point of the SLAC Linear Collider (SLC). The detector is a powerful tool for distinguishing displaced vertex tracks, produced by decay in flight of heavy flavour hadrons or tau leptons, from tracks produced at the primary event vertex. The requirements for this detector include a very low mass structure (to minimize multiple scattering) both for mechanical support and to provide signal paths for the CCDs; operation at low temperature with a high degree of mechanical stability; and high speed CCD readout, signal processing, and data sparsification. The lessons learned in achieving these goals should be useful for the construction of large arrays of CCDs or active pixel devices in the future in a number of areas of science and technology.

Shadowing in inelastic scattering of muons on carbon, calcium and lead at low x(Bj)

Nuclear shadowing is observed in the per-nucleon cross sections of positive muons on carbon, calcium and lead as compared to deuterium. The data were taken by Fermilab experiment E665 using inelastically scattered muons of mean incident momentum 470 GeV/c. Cross-section ratios are presented in the kinematic region 0.0001<xBj<0.56 and 0.1<Q2<80 GeV2. The data are consistent with no significant ν orQ2 dependence at fixedxBj. AsxBj decreases, the size of the shadowing effect, as well as itsA dependence, are found to approach the corresponding measurements in photoproduction.

\(\Lambda\) and \(\bar{\Lambda}\) polarization from deep inelastic muon scattering

We report results of the first measurements of

The iron calorimeter and muon identifier for SLD

\Lambda

Nuclear shadowing, diffractive scattering and low momentum protons in μXe interactions at 490 GeV

and

The limited streamer tubes of the SLD

\bar{\Lambda}

The SLD VXD3 detector and its initial performance

polarization produced in deep inelastic polarized muon scattering on the nucleon. The results are consistent with an expected trend towards positive polarization with increasing

A nonflammable gas mixture for plastic limited streamer tubes

x_{\rm F}

Hadron showers in a low-density fine-grained flash chamber calorimeter

. The polarizations of

Spatial resolution of profile-based detectors with external pick-up strips

\Lambda