From: Djamel Ouerdane (ouerdane@nbi.dk)
Date: Thu Feb 13 2003 - 08:52:32 EST
Hi all,
A new version of brat is on the market.
Version is 2.7.4 and tag is BRAT-2-7-4
The changes deal with some TOF stuff. In the rdo module, the energy loss
information saved was the geometrical average from top and bottom tubes.
This is not true anymore. Both top and bottom are saved. You can still get
the average with the same method as before
(BrTofRdo::BrTofHit::GetEnergy()) but you now have Get{Top,Bot}Energy too.
Same thing for the BrTofPid class.
I also slightly modified the way this energy is used for tof hit
selection. It used to be : de_top > threshold && de_bot > threshold.
It is now : sqrt(de_top*de_bot) > threshold
(another thing related to Peter's last comment on the TOF. There is no cut
on hit_slat - track_pointed_slat at all in brat. The cut is determined at
job initialization by what you think should be considered as a matching in
cm and _not_ in slat difference. Pawel told me that for TOF1, 0.65 or 0.7
cm is a good value, it takes into account the track direction uncertainty.
Below that, you screw up the effiency of the matching for this
hodoscope. What Peter showed makes me think about a geomtry problem. The
slat positions are determined by the TOF parameter class where the
slat positioning was picked up from brag as is. If it's not correct, then
the matching is screwed but I really think it's not the problem.)
I have made sure that the class version number of the modified data
classes was incremented.
I also updated the bdst package according to the brat updates.
I added new members in the global branch, namely the number of tubes in
the left and right BBC arrays involved in the vertex reconstruction. Quite
cool to see that the independent centrality determination has an excellent
correlation with the number of tubes involved in the BBC vertexing :)
I've made a reconstruction test from Au+Au local track files in data01 to
DSTs. No problems encountered so far.
Enjoy :)
Djam
--
Djamel Ouerdane ------------------------------------------o
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