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Fix a bug in Nieves CCQE hadron tensor #5

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Fix a bug in Nieves CCQE hadron tensor #5

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31 changes: 28 additions & 3 deletions src/Physics/QuasiElastic/XSection/NievesQELCCPXSec.cxx
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Expand Up @@ -922,11 +922,36 @@ int NievesQELCCPXSec::leviCivita(int input[]) const{
// Calculates the constraction of the leptonic and hadronic tensors. The
// expressions used here are valid in a frame in which the
// initial nucleus is at rest, and qTilde must be in the z direction.
double NievesQELCCPXSec::LmunuAnumu(const TLorentzVector neutrinoMom,
const TLorentzVector inNucleonMomOnShell, const TLorentzVector leptonMom,
const TLorentzVector qTildeP4, double M, bool is_neutrino,
double NievesQELCCPXSec::LmunuAnumu(const TLorentzVector neutrinoMom1,
const TLorentzVector inNucleonMomOnShell1, const TLorentzVector leptonMom1,
const TLorentzVector qTildeP41, double M, bool is_neutrino,
const Target& target, bool assumeFreeNucleon) const
{

// copy the const value to do the transfermation
TLorentzVector neutrinoMom = neutrinoMom1;
TLorentzVector inNucleonMomOnShell = inNucleonMomOnShell1;
TLorentzVector qTildeP4 = qTildeP41;
TLorentzVector leptonMom = leptonMom1;

// Boost to nucleon rest frame to calculate the nucleon rest frame cross section
TVector3 beta = -1.0 * inNucleonMomOnShell.BoostVector(); // boost from lab to nucRest
neutrinoMom.Boost(beta);
leptonMom.Boost(beta);
qTildeP4.Boost(beta);
inNucleonMomOnShell.Boost(beta);

// Find the rotation angle needed to put q3VecTilde along z
TVector3 zvec(0.0, 0.0, 1.0);
TVector3 rot = ( qTildeP4.Vect().Cross(zvec) ).Unit(); // Vector to rotate about
// Angle between the z direction and q
double angle = zvec.Angle( qTildeP4.Vect() );

neutrinoMom.Rotate(angle, rot);
leptonMom.Rotate(angle, rot);
qTildeP4.Rotate(angle, rot);
inNucleonMomOnShell.Rotate(angle, rot);

double r = target.HitNucPosition();
bool tgtIsNucleus = target.IsNucleus();
int tgt_pdgc = target.Pdg();
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