Oh yes, other questions: Imagine you combine with only 2 local tracks. Then you try to see if it swims back to the vertex. It means: 1- that you already have a vertex in hand 2- that you supposed that good tracks originate from this vertex what about protons from lambda decays?? isn't it true that a lambda can decay within the uncertainty of the vertex position? BTW, should we make the track selection or cut in this global tracking module? My opinion is: I would rather create a table or "bank" of combined tracks that is available all the time since the vertexing procedure is not definitive. BTW again, in principle, a particle that goes through H1 and H2 gives us 2 times. In theory, with 2 times, you can determine the track vertex, that's easy. Now one should study the effect of the uncertainty we have on positions and times on this track vertex position. I'm gonna do that when I am back (or if you're sure that it's not worth, please tell me before!). Djamel :o) ********************************* )o: |ME : Djamel Ouerdane | |EMAIL : ouerdane@nbi.dk | |OFFICE : Tb1 @ NBI | |INST : Niels Bohr Institute | | Blegdamsvej 17, | | DK-2100 København Ø | | Danmark | |PHONE : +45 353 252 69 (office) | |HOME : Julius Blomsgade 31, 2TH | | 2200 Copenhagen N | | Danmark | :oD ********************************* \o:
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