----- Original Message ----- From: "Zbigniew Majka" <ufmajka@cyf-kr.edu.pl> To: <brahms-l@bnl.gov> Sent: Tuesday, November 13, 2001 12:47 PM Subject: Run plan > .... > Justification: > 1. All DCs are working and we have to try to use them > to obtain unique results. > .... > Zbigniew > Dear Zbigniew and Powel, It would be very nice if you could add some more information on "all DC's are working" for the people who are not so familiar with the details of DC performances to help decide what program we would focus on for the rest of the run. I understand that still a lot of work is required to answer some of the questions, but I think it would be very informative for all of us if you let us know as much as possible on those questions. Thank you in advance. 1. Efficiency - What are the plane-by-plane efficiencies (hardware efficiency) with the current HV and threshold settings? I assume the numbers are quite high (>90%?), otherwise we'll have serious difficulties to reconstruct tracks. - What are the centrality dependent track reconstruction efficiencies (software efficiency, if you like)? I understand those numbers are much harder to estimate, but we have to know them for any yield calculations as we all know. One of the ways to estimate the numbers is inserting MC tracks into real events or merging two reconstructed events and try to reconstruct the mixed events. 2. Track Reconstruction at 12 (and 20 and 3/4) degree - What are the mean number of the hits in the planes as a function of the centrality (Tile ADC Sum, BB Multiplicity, or Trigger 6)? - If you reconstruct tracks with the current CD configurations and reconstruction software/geometry/parameters, what are the mean numbers of tracks in T3, T4, and T5 as a function of the centrality? - What are the numbers for (T4+T5 matched tracks)/(T4 tracks) or (T4+T5 matched tracks)/(T5 tracks), also as a function of the centrality? 3. Extrapolating Tracks - How does a distribution of "position of T2 tracks projected on T3 - position of the nearest hit in T3", say for central (or trigger6) events at 12 (and 20, 3/4) degree? This will more or less tell us whether we can utilize T3 without recontructing tracks in it. Regards, JH
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