[ROOT] About Boost on TLorentzVector

From: Delphi Delphi (mundim@uerj.br)
Date: Tue Oct 02 2001 - 17:15:31 MEST 

Hi

Suppose the decay a -> b+c , we know the 4 vectors of b and c.  We need
to know the phi angle of b on the a rest frame. First, we  took the
boost vector :

TVector3 boost = -(b+c).BoostVector()

then,

b->Boost(boost);

Could someone tell us which is the direction of the Z axis on the  "a"
rest frame: the lab Z axis or the direction "a"? If we are doing
something wrong, what is the right way to get this angle?

Thanks in advance.

M. E. Pol and Luiz Mundim

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