void SM_U1_B::FillSpectrum(const PDF::ISR_Handler_Map& isr) {
p_dataread->RereadInFile();
p_constants->insert(make_pair(string("M_Z'"),
p_dataread->GetValue<double>("M_Z'",-1.)));
p_constants->insert(make_pair(string("g'_1"),
p_dataread->GetValue<double>("g'_1",0.)));
double MZprime(ScalarConstant(string("M_Z'"))),GZprime(0.),inc;
double g1prime(sqr(ScalarConstant(std::string("g'_1"))));
FixMix();
msg_Out()<<"Calculate width for Z' with mass = "<<MZprime<<" GeV.\n";
for (short int i=1;i<=6;i++) {
Flavour quark = Flavour((kf_code)(i));
double massq = quark.HadMass();
if (!quark.IsOn() || !quark.Strong()) continue;
if (i%2) {
if (2.*massq>MZprime) continue;
GZprime += inc =
3.*MZprime*g1prime/(24.*M_PI)*pow(1.-sqr(2.*massq/MZprime),3./2.);
msg_Out()<<" Add Z' --> "<<quark<<"+"<<quark.Bar()<<" ("<<i<<"), "
<<" add "<<inc<<" GeV.\n";
}
else {
double M2 = MZprime*MZprime, mq2 = massq*massq;
for (short int j=2;j<=7;j+=2) {
Flavour anti = Flavour((kf_code)(j)).Bar();
if (!anti.IsOn() || !anti.Strong()) continue;
double massa = anti.HadMass(), ma2 = massa*massa;
if (massq+massa>MZprime) continue;
Complex mix = ComplexMatrixElement(std::string("UpMix"),i/2-1,j/2-1);
double absmix = ATOOLS::sqr(mix.real())+ATOOLS::sqr(mix.imag());
if (ATOOLS::IsZero(absmix)) continue;
GZprime += inc =
3.*g1prime*absmix/(24.*M_PI*M2)*
((2.*M2-mq2-ma2)/2.-3.*massq*massa-ATOOLS::sqr(ma2-mq2)/(2.*M2)) *
sqrt(ATOOLS::sqr(M2-mq2-ma2)-4.*ma2*mq2)/(2.*MZprime);
msg_Out()<<" Add Z' --> "<<quark<<"+"<<anti<<" ("<<i<<"), "
<<" add "<<inc<<" GeV.\n";
}
}
}
Flavour flav;
flav = Flavour(kf_Z0_2);
flav.SetMass(ScalarConstant(string("M_Z'")));
flav.SetHadMass(MZprime);
flav.SetMassOn(true);
flav.SetWidth(GZprime);
msg_Out()<<METHOD<<" initializes Z' boson with \n"
<<" mass = "<<MZprime<<" GeV and width = "<<GZprime<<" GeV\n"
<<" for g'_1 = "<<ScalarConstant(std::string("g'_1"))<<".\n";
}
void Lund_Interface::AdjustProperties(Flavour flav)
{
int kc = pycomp(SherpaToIdhep(flav));
if(kc>500) return;
// adjust mass
double pythiamass = pydat2.pmas[1-1][kc-1];
double sherpamass = flav.HadMass();
flav.SetMass(pythiamass);
if( !(abs(sherpamass-pythiamass)/sherpamass < 1.e-2) ) {
msg_Info()<<METHOD<<" Adjusted mass of "<<flav<<" ("<<flav.Kfcode()
<<") from "<<sherpamass<<" to "<<pythiamass<<" to allow Pythia decays."<<endl;
}
}
