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Re: GetPosition() [message #15120 is a reply to message #15118] Wed, 07 August 2013 11:50 Go to previous message
Ralf Kliemt is currently offline  Ralf Kliemt
Messages: 497
Registered: May 2007
Location: GSI, Darmstadt
first-grade participant

From: *gsi.de
Hallo Simon,

GetPosition() and Pos() return the position where the current four-momentum of the particle is defined. The momenum direction will change if you define it at another place of the measured trajectory.

After a vertex fit the daughter particles will have their four-momenta defined at the decay vertex (that's the goal).
You may also (since yesterday) use GetDecayVertex() at your composite. You'll be returned a RhoVector3Err, which is basically a TVector3 and a 3x3 TMatrixD for the covariance.

Cheers
Ralf

[Updated on: Wed, 07 August 2013 11:50]

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