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1. The muon ID
   The best value to find muons in our case is around 3.
   If you then check the invariant mass of the two muons, you should see this:

   

2. After adjusting the boundaries, you can see, where the most pairs have their mass:
   at 3.1 GeV.

   

3. In the electron case your first histogram should look like this:

   

4. After tuning the elctron cut to about 3 and looking more closely, you should get this:

   

The bump or ``signal'' you see at about 3.1 GeV is the J/Psi particle.

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CLEO WEB PAGES
Updated: 1. December 1995
Author: Andreas H. Wolf (ahw@mps.ohio-state.edu)