Radphi Conference Call 5/03/02

May 3, 2002
University of Connecticut
Storrs, CT

Present: S. Teige, Dan K., Craig, E. Smith, Dan S., R. Jones, M. Kornicer.

Craig:

• 12 tubes have arrived at UI (out of 24 XP2020 with bases). The other 12 are still at Jlab, and Elton is trying to locate them.

Dan S.:

• shows a clear reduction in cluster multiplicity . Plan:
  • look for signal in 5,6 gamma events with and without cluster reclaim: look for b1 in 5gamma, and eta->3pi0 in 6gamma.
  • try Craig's cuts if it is difficult to see the signal without these cuts.

• shows recoil comparison. Has to check with Monte Carlo why the peak around 1 is so broad. Will fix cosTheta* calculation, currently unreliable? Also check:
  • acceptance corrected mass plot looks differently when recoil reconstruction is included, than the one shown during previous conference call. It is not clear why 2pi0 mass is flat above f0(975) region, and increases below 0.6 GeV.
  • t-acceptance increases toward zero, while we expect at least to fall down, if it is not 0 at zero-momentum transfer.
  • phi acceptance asymmetry and hump in the acceptance corrected phi distribution has to be examined.

• fitter is almost done. He is testing with Monte Carlo using single Gaussian fit (E=3.0 GeV Theta=15, Phi=35, 100 photons). Will check errors, currently using 8% of the block energy, and more plausible function such as two Gaussians.

• still planned for 6/28-6/29 at W&M.