psi' --> pi+pi- Omicron?  

It is speculated that the decays psi'-->pi+pi- X is a copious
source of tagged three gluons.  These gluons could coalesce 
to form a vector glueball state dubbed the Omicron.
Omicron --> rho pi is expected to be a preferred decay mode.


Data:  Use all psi' data. 
        
   Require:  4 charged tracks with |cos theta|<0.74
               Sum charge = 0
               le 1 trks identified as muons
               le 1 showering trks (showering trk = ESHC > 0.8 GeV)
             between 2 and 10 neutral trks
               E > 50 MeV 
               at least 2 ESC layers with significant energy
               angle from nearest chgd trk > 26 deg.  
             
             4-C fit to pi+pi-pi+pi- gamma gamma with chisq<15.  
             (use gamma gamma combination with lowest chisq)  

             No pi+pi-pi0 mass combination within: 
                50 MeV of the J/psi
 
             pi+pi-pi+pi- mass < 3.35  (eliminate chi states)
    
             gamma gamma mass within 35 MeV of the pi0
              
             Unmatched gamma energy<200 MeV

            "rho" = pi pi mass within 100 MeV of the rho mass


Results:  (Figs 1a-d = "rho  pi results"; Fig 2 = "fit to the omicron?")
          
          Fig 1a:  pi+pi- mass (x) versus pi+/- pi0 mass (y)
          Fig 1b:  rho0 pi0 mass
          Fig 1c:  rho-+ pi+- mass
          Fig 1d:  1b + 1c

          Fig 2:  fit the largest peak in the Fig 1d data (near 1.6 GeV)
                  to a gaussian  plus a bkgd function

                  find 23 +- 8 evnts at m=1.63 w FWHM = 34 MeV (too narrow?)

          No other evident structures.