void Meson_Capture_Off_Shell(Particle &daughter1, Particle &daughter2, Particle &mediator, double theta){
double thetad = mediator.Theta();
double phid = mediator.Phi();
mediator.Rotate_y(-phid);
mediator.Rotate_z(-thetad);
TwoBodyDecay(mediator, daughter1, daughter2, theta);
mediator.Rotate_z(thetad);
mediator.Rotate_y(phid);
daughter1.Rotate_z(thetad);
daughter1.Rotate_y(phid);
daughter2.Rotate_z(thetad);
daughter2.Rotate_y(phid);
Link_Particles(mediator,daughter1);
Link_Particles(mediator,daughter2);
}
void Nucleon_Scatter::scatterevent (Particle &DM, Particle &Nucleon, std::function<double(double)> Xsec, Linear_Interpolation& Xmax){
double EDMMax = scatmax(DM.E);
double EDMMin = scatmin(DM.E, DM.m, Nucleon.m);
double dsigmax = std::max(Xsec(EDMMax),Xmax.Interpolate(DM.E));
double xe,thetaN,phiN,pN;
while(true){
xe = Random::Flat(0,1)*(EDMMax-EDMMin)+EDMMin;
if(Xsec(xe)/dsigmax > Random::Flat(0,1)){
thetaN = Ef_to_N_Theta(DM.E,xe,DM.m,Nucleon.m);
phiN = Random::Flat(0,1)*2*pi;
pN = sqrt(pow(DM.E+Nucleon.m-xe,2)-pow(Nucleon.m,2));
Nucleon.ThreeMomentum(pN*sin(thetaN)*cos(phiN),pN*sin(thetaN)*sin(phiN),cos(thetaN)*pN);
Nucleon.Rotate_y(DM.Theta());
Nucleon.Rotate_z(DM.Phi());
break;
}
}
}
