Slide 1                      S.Olsen 
                                                    PICTEL    5/10/96

         Comparison of:
               psi' and J/psi -->omega pi+pi-; omega f_2; gamma f_2
 	
       MOTIVATION:
                 -Check IHEP (Li Xinhua) results:

                  Br(psi'-->omega pi+pi-) = (5.56 +/- 0.74 +/- ?) * 10^{-4}

                  Br(psi'-->omega f_2)  =  (8.1 +/- 5.3 +/- ?) * 10^{-5}

                  Br(psi'-->gamma f_2)  ~  2.3 * 10^{-5}
                                   |
                       f_2 mass appeared to be too low (about 1.20 GeV)
                       in the 1994 data                  
       DATA:
                 -Use 94 and 95 psi' data   3.44 M psi' decays

       TECHNIQUE:
                 -Compare psi' decays to those from J/psi's produced via
                        psi'-->pi+pi-J/psi

                           N_evnts(psi'-->X;  X-->f.s.)
Br(psi'->X)  =  -----------------------------------------
                      N_psi' accept'(X) Br(X-->f.s.) 

Br(J/psi->X) =
                    N_evnts(psi'-->pi+pi-J/psi; J/psi-->X; X-->f.s.)
       -----------------------------------------------------------------------
         N_psi' accept(X) Br(X->f.s.) Br(psi'->pi+pi-J/psi) accept(pi+pi-)


Here f.s. is the final state accepted in the analysis, accept'(X) (accept(X))
is the acceptance for psi'--> (J/psi-->) X and accept(pi+pi-) is the acceptance
for the pi+pi- for the psi'-->pi+pi-J/psi cascade decay.  Lots of stuff 
cancels out in the ratio of branching fractions:


Br(psi'-->X)                                      N(psi'->X, etc.)  accept'(X)
------------=Br(psi'->pi+pi-J/psi) accept(pi+pi-)---------------- x ----------
Br(J/psi->X)                                      N(J/psi->X, etc)  accept(X) 


Using:
        Br(psi'->pi+pi-J/psi) = 0.324 +/- 0.026 from the PDG 
and
       accept(pi+pi-) = 0.59   for pi+ pi- with |cos_theta|<0.8  (from Fred H.)

and assuming   accept'(X) = accept(X)  (reasonable if we are careful with
the choice of cuts), the ratio measurement becomes an event counting 
experiment:

              *********************************************
              *   Br(psi'-->X)          N(psi'->X, etc.)  *
              *   ------------ = 0.19 x ----------------  *
              *   Br(J/psi->X)          N(J/psi->X, etc)  *
              *********************************************


The 14% rule translates into roughly equal numbers of psi and J/psi events.