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Recent Results from the MAC and MARK II Detectors at PEP

  • Jonathan Dorfan

Abstract

The results presented below come from data taken at PEP by the MARK II and MAC detectors. The MARK II detector is well-known and a description of the detector can be found in Ref. 1. During the 1981 summer shutdown, the MARK II group removed their inner drift chamber and replaced it with a vertex detector. The vertex detector (fully described in Ref. 2) is a high-precision drift chamber which has four layers of axial wires clustered close to the beam axis at an average radius of 11 cm and three layers clustered at an average radius of 31 cm. The chamber construction and operating considerations have been chosen so as to achieve excellent spatial resolution. The chamber routinely achieves a spatial resolution (per layer) of < 100μ and has been successfully incorporated into the detector trigger, software, et cetera. Because of a short in the MARK II coil, all data taken since January 1982 have half the normal magnetic field of 4.5 Kg. Fortunately, the vertex chamber’s impressive resolution all but salvages the lost momentum resolution due to the reduced field. Most of the MARK II data presented herein correspond to 14.5 pb−1 collected prior to the installation of the vertex detector or the short in the magnet. Some results, as noted in the text, are based on additional data with the vertex chamber and the reduced field. The Monte Carlo simulations for this new data incorporate the changes in the detector configuration

Keywords

Drift Chamber Thrust Axis Hadronic Event Visible Energy Decay Path 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Jonathan Dorfan
    • 1
  1. 1.Stanford Linear Accelerator CenterStanford UniversityStanfordUSA

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