By A. Seiden (auth.), Francesco Villa (eds.)
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Phys. B208, 365 (1982). 34 Discussion A SEIDEN (2 nd part) AH. WALENTA There is a detailed study of the ARGUS group which indicates that the reconstruction efficiency for secondaries vertices is considerably improved if the second coordinate has the same high precision. You did not consider the second coordinate: could you comment on this SUbject? A SEIDEN If the precision in both coordinates is as good as in the one, you have to have an improvement. If the measurements in the two coordinates, are poorer than in the one coordinate then it would require a detailed study as to where the best results would occur.
THE MARK II PEP VERTEX CHAMBER A. Design The PEP vertex chamber5 was designed to optimize impact parameter resolution for measurements of heavy quark and lepton lifetimes. 2 cm radius. By measuring points at both small and moderate radii, the chamber permitted track extrapolation to be essentially independent of the less precise central-tracking chamber behind it. £m titanium which absorbed fluorescence X-rays from nearby synchrotron masks. 2 m long. The wire load was supported by the outer aluminum shell, which was securely fixed to 2" thick aluminum endplates.
A measurement of Vb->u/Vb->c using exclusive decays suffers from too few events. An alternative approach that has been looked at for PEP is a search for B± -+ r±v. 6% ( fb ) 200 MeV 21 Vb->u 12 Vb->c If this is measurable, it would establish IYb->u/Vb->cl within the uncertainty coming from fb (perhaps 50%). Depending on background, it is expected that a limit can be set near 10- 3 , which corresponds to IYb->u/Vb->cl < 1/4, near its present upper limit. Thus, it is unlikely that this measurement will be competitive with CESR.
