We have generated 30M isotropic phase space distributed events of the type gamma proton -> neutron pi+ pi+ pi- with "t" distribution of exp(-5|t|). The event-by-event beam density matrix was calculated and used to weight the events via Adam Szczepaniak's weighting function. Two samples of weighted events were produced: 100% polarization in the lab(128,664 events), and unpolarized(153,459 events). See the distribution above(9Jun2000 "some distributions"). In preparing for the PWA fitting we have generated 6 sets of amplitudes (J(PC)M : 2(++)+1, 2(++)0, 2(++)-1, 1(++)+1, 1(++)0, 1(++)-1 ) for both the generated and weighted events. The PWA should only find the 2(++)+1 & 2(++)-1 contributions. In addition, a set of event-by-event beam denisity matrices for the generated and weighted events were produced. The weighted event density matrices are used in the construction of the fit likelihood function whereas the generated event density matrices are used in calulating the fit normalization integrals(As a first test, we are assuming 100% acceptance, but eventually the weighted and the generated events will be subjected to the full detector simulation.).
In order to start the PWA fitting, we still need to generate the normalization integrals. As of today, the program to generate these integrals which take into account the event-by-event beam density matrices is still in development(I am expecting the completed program sometime tomorrow morning). Once these int's have been generated, we then need to construct the fit key file of which Dennis Weygand has already done so or has a program which automatically does it. After that, we should be ready to start fitting the data..