Usage of DeltaR

Newbie
1

Hello,

I have started using PtEtaPhiMVector instead of TLorentzVector as it is recommended in ROOT: TLorentzVector Class Reference

So, my question can be rather basic: Is it an easy way to compute DeltaPhi or DeltaR as it was done with TLorentzVector ?

Thanks
Salva

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2

May be @jonas or @moneta can help you.

3

Just to give some extra information about my original query. With TLorenzVectors, DeltaR between 2 TLorentzVectors is simply computed with: v1.DeltaR(v2)

While if v1 and v2 were PtEtaPhiMVector, if I try the same: v1.DeltaR(v2), then I obtain the following error: error: no member named ‘DeltaR’ in ‘ROOT::Math::LorentzVector<ROOT::Math::PtEtaPhiM4D >’

Cheers
Salva

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4

I proposed a PR to add it: [math] add DeltaR to GenVector by ferdymercury · Pull Request #18728 · root-project/root · GitHub

5

I think I am running into the same problem. I don’t understand much about it as it seems that DeltaR is included in Math::LorentzVector: ROOT: ROOT::Math::LorentzVector< CoordSystem > Class Template Reference

6

Hi!
DeltaR was added very recently. So it might be that your ROOT version does not yet have it. In the meantime, you will have to build from master branch instead.

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