Flemming Videbaek wrote: > Just one (trivial) comment of the charge discussion. > > The BrModuleMatch class that is used multiple places in the tracking > evaluates p/q as a signed value for each match. Thus the sign of the charge > is determined tough not the actual value of course. One may refit the value > of momenta later by other methods but one should not re-do the sign later. > Of course it evaluates p/q, that is what magnets do. I was only making the (trivial) point that there will be particles for which TMath::Abs(charge)>1. Sadly, there will not be many such particles, but the few we get are interesting (to me, anyway) and we should not eliminate the possibility of looking at them by non-optimally clever decisions. The refitting is actually just a multiplication, though, isn't it? i.e. if q=2, p_correct = 2*p_reconstructed. Also, I think I have sorted out the geometry problems I mentioned earlier, but now I'm a bit dizzy from playing with the 3D stuff in root. > > Flemming Cheers, -- Ian-------------------------------------------------------------------- | I.G. Bearden | | Niels Bohr Institute Tb 3 email: bearden@nbi.dk | | Blegdamsvej 17 phone: (+45) 35 32 53 23 | | København Ø FAX: (+45) 31 42 10 16 | | Danmark | ----------------------------------------------------------------------
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