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Re: URGENT: geane - coordinate system [message #5099 is a reply to message #5098] Thu, 27 September 2007 15:46 Go to previous messageGo to previous message
Andrea Fontana is currently offline  Andrea Fontana
Messages: 32
Registered: May 2007
continuous participant
From: *pv.infn.it
Hi Sebastian,
the reason why the geane system is with beam along x axis
is, as far as I know, historical and we had adopted this
convention to properly call geane. We can perhaps think
of a different approach, but in all our tests it did not seem
necessary so far.
Regarding CbmTrackParP, I think the comment is not correct:
all the calculations in SD are internally done with the
convention (q/p,v',w',v,w). See for instance the calculation
of the covariance matrix in SD, where we write:

...
fDQp = TMath::Sqrt(fabs(fCovMatrix[0]));
fDTV = TMath::Sqrt(fabs(fCovMatrix[5]));
fDTW = TMath::Sqrt(fabs(fCovMatrix[9]));
fDV = TMath::Sqrt(fabs(fCovMatrix[12]));
fDW = TMath::Sqrt(fabs(fCovMatrix[14]));
...

See also our report for the SD definition.
Hope this helps.

Ciao,
Andrea
 
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