Message-Id: <200106021341.WAA12624@neutrino.kek.jp> To: e362scifi cc: lbkek Subject: Minutes of SciFi meeting (02/June/'01) Date: Sat, 02 Jun 2001 22:41:13 +0900 From: Makoto Sakuda <sakuda@neutrino.kek.jp> Subject: Minutes of SciFi meeting (02/June/'01, 9-11am, R425) Agenda 1. Detector performance --Yokoyama 10min 2. MC study -- Walter 10min 3. E_nu study -- Boyd 15min 4. Event Selection -- Iwashita 15min 5. q^2 analysis --Jeon 15min 6. 2-track analysis -- Ishida 10min 7. Upgrade -- Sakuda 10min 8. Performance -- B.J.Kim 10min 1. Data sample -- Iwashita He summarized the status of data and MC. Y2001 MC is being processed. Y2000 data need to be reprocessed with new code. MC (NEUT4.1 and NUANCE) for Y2000 already exist. NUANCE for Y2001 config should be made. Steve points out that improving MC statistics will improve the systematic error of E_nu analysis. We need at least 400k events, while we have 200k events now. => We will ask MC group for more events. Hayato temporarily made 20k events for NEUT*Rescatt (Wojtek version) sample. He is worried about many low energy tracks in the sample. Chris will check this problem. Instead, we will use NEUT and NUANCE samples for the analysis. 2. Detector performance -- Yokoyama She showed the outline of her talk at K2K meeting. She summarized the online monitor, the efficiency, Npix, noise vs time. She will also study vertex vs time. 2. New data -- Walter He showed vertex (x,y,z) distributions, E_mu and theta_mu from Y2001 data. All look normal. (Can you use the common bin size for P(0.1 GeV/c), costheta (0.05)? Other groups will use the same bin size. For both muons and protons.) 3. E_nu -- Boyd He showed the efficiency and S/N for E_nu analysis w/without LG. Efficiency becomes 0.12->0.26, and background fraction 58%->51%. We may need mu,pi/proton separation. Below 1 GeV, can you check the efficiency for 2-tracks w/wo LG? He also studied the reduction of background in the present 1-track sample, by using 2-hit track info. QE/All becomes 55%->61%, while the QE efficiency is 93%. This relies on the noise study which Ishida is working on. 4. 2-track analysis -- Ishida Ishida showed the outline of 2-track analysis. He need help from Hyeonseo who is very busy now. Bockjoo, could you take care of this? (Ishida will send questions to Bockjoo.) We need the numbers for our analysis and NIM paper. He will also study FC3/FC8. 5. Q^2 analysis -- Jeon She showed q^2 analysis and the fit to dsigma/dq^2 with MA. She need new MC for Y2001 data. 6. Upgrade -- Sakuda Based on Boyd's study, he showed several options for the upgrade if LG was dismounted in summer 2002 and estimated the cost/labor. 1) Simplest option is to have 2cm thick acryl/lucite Cherenkov counters downstream of SciFi to separate mu,pi from protons. 2) TOF counters. 3) top/side counters. Okayama/Niigata groups are interested in the beam test. 7. Detector performance paper -- B.J.Kim He automates the software alignment and will update the corresponding figures. He is updating the draft. Some of new figures will be made during the K2K meeting. //
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