Define a boost 3-vector and boost a 4-vector

Hi Ioannis,

We fixed several bugs related to this variable in v1.5 beta. Are you using this version?

The methods you are looking for are then located in
  tools/SampleAnalyzer/Commons/Vector/MABoost.h

Does it help?

Cheers,

Benjamin

On 04 Nov 2016, at 11:42 , Ioannis Tsinikos <email address hidden> wrote:

> New question #403789 on MadAnalysis 5:
> https://answers.launchpad.net/madanalysis5/+question/403789
>
> Dear MA5 experts,
>
> I am working on a ttj sample and I want to go to specific frames in the expert mode.
>
> I am trying to define the boostvector to the Center Mass Frame of the two tops and the jet 'a la ROOT':
> TVector3 CM_RF = -(t_lab.momentum()+tx_lab.momentum()+j_lab.momentum()).BoostVector();
> This gives error: no member named 'BoostVector' in 'MA5::MALorentzVector'.
>
> Then again I try to boost the top momentum:
> t_lab.momentum().Boost(CM_RF);
> This also gives error: no member named 'Boost' in 'MA5::MALorentzVector'
>
> I also try to simply define a unit 3vector:
> TVector3 v1 = t_lab.momentum().Vect().Unit();
> and I get : no viable conversion from 'MA5::MAVector3' to 'TVector3'
>
> Is this normal? In previous versions of MadAnalysis I was using exactly this way to do boosts and it was working. Is it disabled for some reason? The MALorentzVector is not the TLorentzVector of ROOT? Why the 3-vector of MadAnalysis is no longer recognized as a ROOT TVector3?
>
> Note that for the 't_lab.momentum()' I can use all the other functions defined by ROOT for a TLorentzVector, like Phi, Pt, DeltaPhi, Rapidity etc.. It seems that there is an issue only with the functions related to boosts.
>
> Thank you in advance,
> Ioannis
>
>
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