From: Djamel Ouerdane (ouerdane@nbi.dk)
Date: Mon Mar 31 2003 - 17:20:14 EST
Hi , Yesterday evening, while writing on my thesis, I had an idea on investigating a bit more multiple hits in H1. So far, the check was done by looking at hits shared by different FFS tracks. I realized that it could be done also by looking at the rest of the T2 tracks (those that did not contribute to the track-tof matching, be they used for FFS tracking or not). I simply evaluate the slats these T2 tracks point to, look up the FFS-H1 matching table (only single FFS-H1 matchings) and compare if slats are shared. The result can be found here : http://www.nbi.dk/~ouerdane/quick/#multi I put a module in brat/modules/util called BrT2Tof1MatchingModule (stupid name since it's not really what it does). In the reco, put it just after the BrFfsTof1MatchingModule in the mainmodule. It has only one parameter: SetMaxDX() which by default is 0.7 cm. For those doing analyses, let me describe the rudimentary status for track-tof matchings: BrTofTrackMatch::IsMultiple() returns an integer. It can be : 0 : single matching 1 : multiple matching FFS-FFS when the track pointed slat are the best candidates in each case (*) 2 : multiple matching FFS-FFS when one of the track pointed slat is the best candidate and the other is a second candidate (*) 3 : multiple matching FFS-FFS when track pointed slats are both second candidates (*) 4 : NEW! multiple matching T2-FFS with the pointed slats being the best candidates. (*) : FFS tracks can intersect two slats. The best slat candidate is defined as the slat where the track path length inside is the longest. The brat version number has been incremented to 2.8.3, idem for the tag. Djam -- Djamel Ouerdane ------------------------------------------o | Niels Bohr Institute | Home: | | Blegdamsvej 17, DK-2100 Ø | Jagtvej 141 2D, | | Fax: +45 35 32 50 16 | DK-2200 Copenhagen N | | Tel: +45 35 32 52 69 | +45 35 86 19 74 | | http://www.nbi.dk/~ouerdane | | ouerdane@nbi.dk | o---------------------------------------------------------o
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