Home » PANDA » PandaRoot » Bugs, Fixes, Releases » PndLhePidTrack
| Re: PndLhePidTrack [message #10540 is a reply to message #10537] |
Thu, 15 April 2010 13:03   |
Gianluigi Boca
Messages: 177
Registered: March 2004
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first-grade participant |
From: *gsi.de
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| Tobias Stockmanns wrote on Thu, 15 April 2010 08:24 |
Hi Stefano and Donghee,
what about track finding? I thought that conformal mapping relies on tracks coming from the primary vertex.
Cheers,
Tobias
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In the STT pattern recognition indeed there is the assumption that tracks come from 0,0,0 . This assumption is crucial for the algorithm to work. Indeed it works well as long as the interaction vertex is far from 0,0,0 a few mm. When the vertex is farther than 1 cm then problems arise (loss of efficiency and spurious hits inclusion).
Consequently. based on my experience, I would be (very) surprised if any pattern recognition algorithm using the conformal mapping in the XY plane, worked when the primary vertex is far 5 cm from the expected position.
That is also the reason why I have always claimed that as far as the Lambda is concerned we need to write a special pattern recognition package.
Gianluigi
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