Dear J.H. Lee The centrality dependence analysis for DCs has yet not been done so I can not answer most of your question right now. The track reconstruction efficiencies for the latest runs at 12 deg. for DCs are T3: 70% T4:92% and T5: 70% (only 2 modules for T5 are used). Is is for the trigger #6 events. The efficiencies per plane in T4 and T5 are about 90%. This value is not corrected for a dead channels. Lets us continue this discussion tomorrow. Pawel. "J.H. Lee" wrote: > ----- 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 -- ---------------------------------------------------------------------- | Pawel Staszel | | Niels Bohr Institute Tb 8 email: staszel@nbi.dk | | Blegdamsvej 17 phone: (+45) 35 32 53 51 | | København Ø FAX: (+45) 35 32 50 16 | | Danmark | ----------------------------------------------------------------------
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