[Brahms-dev-l] brat 2-25-20 + minutes

Hello all,
I ve committed changes to BrFsTrackingModule, BrT2T3OffsetModule, 
BrDcEnhancementModule.
Because changes to DcEnhancement are quite important I  put new tag on 
brat which is 2.25.20.

I've tested consistency for the new version of DCEnhancement between 
number of
fs tracks without dc enhancement and with dc enhancement. I also was 
looking for efficiency corrected yields.
This are results (full run #10384):
No DcEnhancement:
 fs tracks with T2WasUsed=kTRUE:  946,   corrected for efficiency:  3077 
 (I)
 fs tracks with T2WasUsed=kFALSE: 1118, corrected for efficiency: 3509  (II)
 all fs tracks: 2064                                         , corrected 
for efficiency: 3297  (I+II)
 this gives 13% inconsistency between (I) and (II) and +/-6% for (I+II),
 The correction factors are 3.3, 3.0 and 1.56 for (I), (II) and (I+II), 
respectively.
With DcEnhancement:
 fs tracks with T2WasUsed=kTRUE: 400
 fs tracks with T2WasUsed=kFALSE:1706
 all fs tracks: 2106                                         , corrected 
for efficiency: 3290

The consistency between final yield is much better than 1%. The small 
increase of
tracks for case with DCEnhancement is due to T5 enhancement only (by ~2-3%).
Enhancement of T3 only replaces tracks with T2WasUsed by regular 
(T1-T2-T3-T4_T5) fs tracks.

Because using too narrow cuts when matching ffs-bfs (T2with T3) we loose 
~15% of statistic.
I'm prepering note on my www discribing the problem (efficiency vs sigma 
range vs background)
+ the general note on efficiency correction in FS.
Will let you know if it is ready.

Best Regards
Pawel.

-- 
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| Pawel Staszel                                                        |
| Jagiellonian University                                              |
| Institute of Physics            email:      ufstasze@if.uj.edu.pl    |
| Reymonta 4                      phone:      (+48) 12 663 5712        |
| Krakow 30059                    FAX:        (+48) 12 633 7086        |
| Poland                                                               |
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