Radphi Video Conference 3/18/03

March 18, 2003
University of Connecticut
Storrs, CT

Present: R. Jones, M. Kornicer, D. Steiner, S. Teige, D. Armstrong, E. Smith

• link at anthrax.physics.indiana.edu/~teige/nim.html
• New draft is out, sent around by email. There is a question about what to say about resolution and nonlinearity. We also need to decide what to say in the conclusions. M. Kornicer estimates 2 weeks to obtain a result from the pi0 end eta sample on the resolution of showers in the lead glass. The section on yields is also incomplete. Scott will look up yields of pi0 and eta in two gamma, and will fetch yields of omega and phi in 3-gamma from note by R. Jones. There will need to be a caveat about the excess phi yield coming from broken b1 events.

• link at http://zeus.phys.uconn.edu/~kornicer/radphi/LGDresolution/#q4.
• He has implemented a new I/O mechanism for storing selected data in a compact file. With this in place he is looking at a sample of good pi0 and eta events. We will not use the pixel cut. Dan S. will check in his cluster reclamation code and it will be used in the formation of the sample.

• The link is http://www.physics.wm.edu/~steiner/radphi/pass_zero.htm
• He has gotten beyond the problems with fits and is now extracting time offsets.

• The link is http://zeus.phys.uconn.edu/radphi/wday-1-2003/kinfitter.ps.gz"
• We went through the tech-note on the design of the kinematic fitter and there was a general agreement about its features. Elton pointed out the problem that putting in a physical width for the eta and pi0 might lead to numerical instabilities due to the small denominator. The consensus was that this could be solved by using a common width for all "stable" mesons of something like 1 MeV to solve this problem.