Radphi Video Conference 4/15/03

April 15, 2003
University of Connecticut
Storrs, CT

Meeting Agenda:

1. Review of items circulated since last meeting
2. Production of benchmark samples - UConn
3. Certification of standard N-gamma reconstruction - W&M
4. Progress on pwa - Indiana
5. Progress on BGV reconstruction - Indiana
6. Plans for another workfest

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

• D. Black seems to be working with qqbar resonance model with the σ, K, a0, f0.
• D. Stainer has released pass0 constants, R. Jones will put them into the map and certify a new make_hits that uses the new constants.
• D. Krop has new plots on his web page, will show them later.

• link at http://zeus.phys.uconn.edu/~kornicer/radphi/LGDresolution/#q4.
• Has made progress on getting a clean ω sample by a minimum photon E cut of 150 MeV.
• Has made good progress on getting a clean η->3π° sample by selection how many π°'s were found in the combinatorics: it seems that η->3π° have a signature that n>3 pairs can be found that form a π° mass.
• Extraction of LGD resolution will be obtained from 2γ mass distributions (π°, η) by a method described on the web at http://zeus.phys.uconn.edu/~kornicer/radphi/LGDresolution/res_2g/index.html. We have been looking at anomalous peak in low mass region in m(2γ) < m(π°). D. Armstrong suggested seeing a CPV cut reduces this peak. Elton suggests reconstructing γp-> pρ(π+π-) and seeing of that might reproduce this effect. M.K plans to have a result for energy resolution in the LGD by the next conference call.

• D. Stainer has produced his own sample of π°, η in 2γ, ω in 3γ, and η in 6γ. There all look much cleaner than Mihajlo's. The reasons are not clear at this point. and need to be understood. D. Stainer agrees that the pixel cut does not do much to improve the signal/background.

• To find ambiguities he is going to do the fit with a large number of starting points and hope to find all of the solutions.

• the link http://k9.physics.indiana.edu/tof/thconway/bgv/index.shtml for calibration progress.
• She has extracted ADC gains by an exponential fit, on the inclusive sample. D. Armstrong suggest a check on recoil proton signal in the BGV.