Slide 1           S.L.Olsen 4/4/96 Pictel mtg

       Is there a k1(1270) signal in psi'-->k0 k+ pi- pi0  (+ cc) decays?
                                      
INTRODUCTION

My study of psi'-->k+k-pi+pi- decays, reported at last week's CUSeeMe 
meeting, indicates a very strong signal for
  
                    psi'-->k1(1270)+ k-   (+ cc)
                             |
                           k+ rho0
                                |
                              pi+ pi-

My preliminary results indicates a Br around 0.1%, which is quite large for
a psi' exclusive channel.  Translating this to J/psi decays via the "14% rule"
results in an expectation that Br(J/psi-->k1(1270) k + cc) is around the
1% level, comparable to that for J/psi --> rho pi, the dominant decay mode. 
Since there are no PDG listings for J/psi-->k1k, one suspects that this decay 
mode is in fact well below the 1% level, and, if my preliminary results
are correct, this psi' decay mode may be an example of a long-sought-for
decay of the psi' that exceeds 14%-rule expectations.  

In order to confirm the signal seen in the k+k-pi+pi- final states, I have
made a first-pass study of psi'-->k0 k+ pi- pi0 (+ cc) final states.  These
should include k1+ signals in the I-spin related decay mode:

                  k1+ --> k0 pi+ pi0

as well a neutral k10 via 

                  psi'--> k10 k0-bar
                           |
                         k+ pi- pi0 

Here I report on the status of this study.

DATA SAMPLE and EVENT SELECTION

       I use 3-4 track DST's  94 and 95 data
                                                     94 data     95 data 
preselection:     4 charged tracks + ge 2 neutrals 
                  net charge = 0
                  < 2 muons
                  < 2 electrons
                  |cos\theta|<0.74 all tracks         129765       237531
                  5-c fit to k+k0pi-gam gam (chisq<50)  4665         8374

selection (Fig 1 shows the 95 data distributions prior to each cut)

     Fig 1a      |M_{gg} - 0.135|<0.035 GeV              581         1022
         1b      Unmatched neutral energy < 0.2GeV       505          973
         1c      chisq(k0k+pi-gamma gamma)<15.           202          409
         1d      Missing M vs k0 < 2.9 GeV               102          206
         1e      Missing M vs k+ < 3.0 GeV                79          173

Figure 1f shows the KLAMSLO ctau distribution for the surviving events. (I
do not make any cuts on ctau.)