Message-Id: <199905312329.IAA12582@neutrino.kek.jp> Subject: Minutes of Scifi weekly meeting (99/05/31) Date: Tue, 01 Jun 1999 08:29:42 +0900 From: Makoto Sakuda <sakuda@neutrino.kek.jp> Subject: Minutes of Scifi weekly meeting (99/05/31) Attendant:Boyd,SuzukiAT,Ishida,Sharkey,Ishino,Park, Iwashita,Kadowaki,Yokoyama,Sakuda 1. Neutrino event selection (Ishino) He required 1) >0 scifi track and >0 mu track, and 2) 1000<time(TMC)<2750 (1.4microsec). Then he obtained 2610 events out of 551540 spills. He scanned 706 events and found 74 nu events, 157 1kton nu events, 90 cosmics and other noise events. He calculated the the angle and the distance between the scifi track and mu track, and found a signal at theta=0 and d=0. SuzukiAT will organize the scanning of 2610 events. 2. Monte Carlo Boyd generated 5000 nu_mu CC events and NC events. He will generate nu_e events. Ishida comments that the true hit information for veto,lg and muon is included. Ishino will estimate the efficiency of the selection using the MC events. Boyd will submit a K2K note for his pixel simulation. 3. Cosmic ray data (Park) He starts analysing cosmic-ray data from May. He had problems with trigger id (now ok). He obtains tha gain correction factors in May data. (He points out that IIT22 has no hits in May data. SuzukiAT found that IIT22 was indeed wrong. It was sent back to Hamamatsu.) 4. EL data Iwashita obtains tha scale parameter for one IIT which is a bit different from that in the library. He will study another IIT and update the parameters in the library. 5. Linearity correction *Sharkey fitted the linearity data with 4th order polynomials and obtained a good fit within 50 microns. The mean value of the correction is about 0.4mm. *He saw no correlation between the residual and the linearity correction. He claims that the linearity correction has no effect. *Boyd comments that he obtains the residual of 2mm or so using the MC (neutrino) events. He will check this point using cosmic-ray MC events. If this is true, then the present performance is limited by multiple scattering. //M.Sakuda
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