S.L.Olsen 10/24/95
             A First Look at psi'-->pi+pi-k+k-

   Initial results from an examination of the following psi' decays,
   

           psi'-->k*(890)^o k_2*(1432)^o    Strong (0.7%) VT mode of the J/psi
                   |          | 
                    ->k+pi-    ->k-pi+

           psi'-->k*(890)^o k*(890)^o      Violates SU(3) (limit for J/psi)
                   |          | 
                    ->k+pi-    ->k-pi+


           psi'-->k1(1271)+ k-  +  cc       AP mode?  no PDG entry for J/psi
                     |
                     -->k+/- rho
                              |
                               ->pi+pi-

  14% rule expectations:  (using acceptance = 0.035 from IHEP psi' group paper)

     -k*0k_2*0   Br(J/psi--> k*0k_2*0) = (6.7 +- 2.6) 10**-3
                 Br(k* -> k+pi-) = 2/3

      expect: 3.44M x 6.7 10**-3 x 0.14 x 0.24 x (2/3)**2 = 348 events
                                           |
                                   guess for acceptance

     -k*0k*0   Br(J/psi-->k*0k*0) < 5 x 10**-4  <--violates flavor SU(3)

      expect: < 3.44M x 5 10**-4 x .14 x 0.24 x (2/3)**2 < 26 events


     -k1(1270)+k-    no PDG entry for J/psi  
                     (but non-strange AP octet decay b1(1235)pi is strong.


  ----data, cuts, etc:

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)
             
             4-C fits to pi+pi-pi+pi- and pi+pi-k+k-
               chisq(pi+pi-pi+pi-) > chisq(pi+pi-k+k-)
               chisq(pi+pi-k+k-) < 8.0

               mpipi < 2.4 GeV  <--eliminates feedthrus from
               mkk < 3.0 GeV    <--psi'-->pi+pi-J/psi
                                                 |
                                                  -->l+l-

               mkk > 1.05 GeV  <--eliminates phi

             Unmatched gamma energy<200 MeV

             "kstar" = k+pi- mass within +/-70 MeV  of 896 MeV
             "rho"   = pi+pi- mass within +/-120 MeV of 770 MeV

Results:  (Fig 1a-d = "pi pi k k results"; Fig 2 = "kstar fit results"
           Fig 3a-d = "k-rho results" Fig 4 = "k-rho fit results"
           Fig 5 = "Kstr pi fit results" Fig 6 = "q0 selection"
           Fig 7 = "q0 fit") 


         -------------k*k* & k*k_2* results-------------

          -plot pi+pi- mass (Fig 1a, 1 entries/event)
         
          -plot k+pi- vs k-pi+ with "rhos" eliminated (Fig 1b)

          -plot k+/-pi-/+ mass distribution (2 entries/evnt, no rhos) (Fig 1c)
          
          -plot k+/-pi-pi+/- mass recoiling against k*(890) (2/event) (Fig 4c).
                  Very strong k* k* signal/ weak k*k_2* signal (if any).

          -Fit k* recoil spectrum to k*(890) + K_2*(1430) + 3rd order poly
               get 41.5 +/- 11.7 x 0.5 k*k*  and 4.9 +/- 5.2 k*k_2*
                                  |
                                (k*k* are double counted)

               k*k* at (above?) the expected upper limit (SU(3) violated) 
               k*k_2* 30x below expectations (VT suppressed mode)
 
         ---------------charged k1(1270) results-------

          -plot pi+pi- mass(x) vs k+pi+pi- mass(y) (Fig 3a)

          -projection on pi+pi- mass axis (Fig 3b).  rho signal is evident

          -plot k+pi-/k-pi+ masses (Fig 3c). k*(890) signal is evident
           
          -plot k+/-rho0 mass, select rho's and veto events with kpi
           combinations within +/-50 MeV of the k*.  (Fig 3d)

          -fit k-rho mass spectrum to BW near 1270 plus 3rd-order polynomial
           (Fig 4).   Strong peak, 22.5 +/- 7.3 evnts, but with wrong mass 
           (1.335 vs 1.273 GeV) and width (48 vs 90 MeV).

          -select events with kpi masses within 90 MeV of the K*(896)
           and fit to two BW's, one near 1.27 and one near 1.40 (Fig 5).
           There is some action at low masses, but the fit doesn't
           assign much significance to it.


         ---------------neutral mode k1(1270) results-------


          -look at 4 prong data with net charge = 0 plus 2 or more gammas

          -4 C fit to psi'-->  pi+ k- k0 gamma gamma 
 
                chisquare<15.
                ctau > 2mm
                unmatched neutral energy < 400 MeV
 
          -Fig 6a shows gamma gamma mass plot

                m gamma gamma = m pi0 +/- 35 MeV

          -Fig 6b k+pi- pi0 mass
          -Fig 6c k0pi-pi0 mass         
          -Fig 6d 6b + 6c

          -Fig 7 Fit  a narrow peak near 1.33 GeV 

          22+/- 8 events with Fit mass = 1304 +/- 7  width = 32 +/- 29 MeV