D. Creanza et al., THE NEW ALEPH SILICON VERTEX DETECTOR, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 409(1-3), 1998, pp. 157-160
The ALEPH collaboration, in view of the importance of effective vertex
detection for the Higgs boson search at LEP 2, decided to upgrade the
previous vertex detector. Main changes were an increased length (+/-
20 cm), a higher granularity for r phi view (50 mu m), a new preamplif
ier (MX7 rad hard chip), a polymide (upilex) fan-out on z side to carr
y the signals from the strips to the front-end electronics outside the
fiducial region reducing consequently the passive material in the cen
tral region by a factor of two. The detector, the running experience a
nd its performance will be described. (C) 1998 Elsevier Science B.V. A
ll rights reserved.