THE CLEO-II SILICON VERTEX DETECTOR

We describe a vertex detector comprised of three layers of double-side d silicon wafers, installed in the CLEO II detector at the Cornell Ele ctron Storage Ring (CESR). The innermost silicon wafers are located a distance of 2.35 cm from the stored electron and positron beams; the b eams carry a total of 300 mA of current. Characterizations of the impr ovements in detector performance since VERTEX'96, results on beam rela ted occupancy, and evaluations of detector resolutions are presented. The prospects for physics results from a data set corresponding to int egrated luminosity 4 fb(-1) with the device installed are discussed. ( C) 1998 Elsevier Science B.V. All rights reserved.