ROOT Version: 6.14 Platform: Ubuntu16.04 Compiler: gcc630 Hi, I am running a code which needs to obtain gamma factor from its TLorentzVector. At the moment, I fill the TLorentzVector with TLorentzVector scalar(ip->pt(),ip->eta(),ip->phi(),ip->mass()); where ip is the generated particle in Mo…

Try: TLorentzVector scalar; scalar.SetPtEtaPhiM(ip->pt(), ip->eta(), ip->phi(), ip->mass()); See also: [image] Boost to rest frame with TLorentzVector made with SetPtPhiEtaM Newbie Hi, TLorentzVector is a legacy class: it’s better to have a look at ROOT::Math::LorentzVe…

Usage of Beta and Gamma factor in TLorentzVector

ROOT

Wile_E_Coyote May 7, 2019, 2:23pm 2

Try:

TLorentzVector scalar;
scalar.SetPtEtaPhiM(ip->pt(), ip->eta(), ip->phi(), ip->mass());