Slide 1                      S.Olsen 
                                                    CUSeeMe   4/12/96

         Study of exclusive psi'-->Axialvector Psuedoscalar decays
 	
       MOTIVATION:

                 -Test 14% rule

                   Search for exclusive psi' decay channels that are
                   _enhanced_ relative to J/psi decays

                  -Test Flavor-SU(3)
                   
       DATA
                 -Use 94 and 95 psi' data   3.44 M psi' decays

       RESULTS
                 -Measure psi'--> b1+(1235) pi-  (+cc, always) 
                                      |
                                     omega(780) pi+
                                         |
                                       pi+pi-pi0

                  select 4 chrg trks  Sigma Q = 0  2 or more E> 50 MeV gammas 
                  |cos\theta|<0.74    5-C fit to pi+pi-pi+pi-pi0

                  omega cut select |M_pi+pi-pi0 - 0.782| < 60 MeV  Fig 1b

                  form pi+/- omega masses  (2/omega)               Fig 1d

                                 
                -Fit pi omega mass distribution 2 ways:

                 i)   Breit Wigner(b1)   +   f_bkgd                    Fig 2
                          |                     |
                  M fixed at 1.232   (F_bkgd=p1(Q**.5 + p2 Q**1.5 + p3 Q**2.5) 
                  Width " "  0.155

                  Nevts = 49.8 +/- 12.6   <---background overestimated?

                 ii)  Breit Wigner(b1)   +  BW["rho(1700)"]        Fig 3
                          |                       |
                  M fixed at 1.232           M around 1.7
                  Width " "  0.155           width "  0.3

                  Nevts = 77.8 +/- 10.4  <---background underestimated?                        
                     use avg of i) & ii)  put diff into syst. error
                 
                 -MC acceptance = 0.033 +/- 0.003

               **************************************************************
               *  Br(psi' --> b1+pi- +cc) = (5.6 +/- 0.7 +/- 1.4) x 10^{-4} *
               **************************************************************

                  agrees with 14% rule "prediction": (4.2 +/- 0.7) x 10^{-4}