| Re: problem with TPC recotasks [message #6170 is a reply to message #6165] |
Thu, 27 March 2008 11:36   |
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Anonymous Poster
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From: *gsi.de
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Hi Sebastian,
>The track finding is done with monte carlo ids in the demo. So if >there have been secondaries they will appear in the track list. >This can in principle even happen for delta electrons!
>Check the momentum of your tracks.
>The momentum that has been reconstructed looks too low in most >cases. At the moment I do not have an idea why this is so.
About the lower values of the momentum for reconstructed tracks may be because the input momentum of protons and pions are low. The Lambda is produced at rest and decays. Following are some sample evets which I have used:
3
N Id Ist M1 M2 DF DL px py pz E t x y z
0 3122 2 -1 -1 1 2 0.0000 0.0000 0.0000 1.1157 0.0000 0.0000 0.0000 0.0000
1 2212 1 0 0 -1 -1 -0.0408 -0.0498 0.0773 0.9436 52.5078 0.0000 0.0000 0.0000
2 -211 1 0 0 -1 -1 0.0408 0.0498 -0.0773 0.1720 52.5078 0.0000 0.0000 0.0000
1 3
N Id Ist M1 M2 DF DL px py pz E t x y z
0 3122 2 -1 -1 1 2 0.0000 0.0000 0.0000 1.1157 0.0000 0.0000 0.0000 0.0000
1 2212 1 0 0 -1 -1 -0.0965 -0.0033 -0.0281 0.9436 17.8040 0.0000 0.0000 0.0000
2 -211 1 0 0 -1 -1 0.0965 0.0033 0.0281 0.1720 17.8040 0.0000 0.0000 0.0000
2 3
N Id Ist M1 M2 DF DL px py pz E t x y z
0 3122 2 -1 -1 1 2 0.0000 0.0000 0.0000 1.1157 0.0000 0.0000 0.0000 0.0000
1 2212 1 0 0 -1 -1 -0.0718 -0.0704 0.0009 0.9436 130.3815 0.0000 0.0000 0.0000
2 -211 1 0 0 -1 -1 0.0718 0.0704 -0.0009 0.1720 130.3815 0.0000 0.0000 0.0000
Regards,
Dipak
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