Physics at a Symmetric Collider

In this chapter we discuss the physics goals using the CESR Phase 3 symmetric collider, capable of producing a peak luminosity of cmsec at the . At this luminosity, the program will cover all aspects of heavy quark and tau lepton physics with high precision; the CLEO III experiment will continue to be at the very forefront of testing and understanding the Standard Model and beyond. Measurements of rare decays and form factors, precision measurements of the CKM parameters and , and the possibility that CP violation may be observed in the B system are just some of the crucial and exciting physics prospects.

To quantitatively evaluate the physics possibilities, we first make some assumptions about the future performance of CESR. We assume that CESR Phase 3 will have provided integrated luminosities of 20 fb on the resonance and 10 fb on nearby continuum within a few years after commissioning. This comes after our projection that CLEO II will have accumulated 5 fb of integrated luminosity and half that amount off the peak during CESR Phase 2. The physics program of CLEO III will have the advantage of an improved detector with excellent charged hadron identification and precision vertex information. The CLEO III detector thus provides the new tools necessary to probe rare processes and extract most of the important new results we foresee. The following sections outline the topics in which precision can be improved or new discoveries can be made.

• decay studies
  • Goals of decay studies
  • and form-factors in semileptonic decays
  • Rare decays
  • CP violation
• Charm decay physics
  • Semileptonic decays
  • Hadron spectroscopy
  • Rare charm decays
  • Measurement of
  • Charm mixing
• Tau decay physics
  • Tau neutrino mass
  • Decay modes and branching ratios
  • Structure of the vertex
  • Tau lifetime
• Two photon physics
• physics
• Conclusions