Hadron_Decay_Channel* Mixing_Handler::Select(Particle* decayer,
const Hadron_Decay_Table& ot) const
{
Flavour flav = decayer->Flav();
string tag = flav.IsAnti() ? flav.Bar().IDName() : flav.IDName();
if(m_model("Interference_"+tag,0.0)!=0.0) {
double lifetime = DetermineMixingTime(decayer,false);
bool anti_at_t0 = decayer->Flav().IsAnti();
if(decayer->ProductionBlob()->Type()==btp::Hadron_Mixing) anti_at_t0 = !anti_at_t0;
if(lifetime!=0.0) {
Hadron_Decay_Table table(ot);
double cos_term = cos(flav.DeltaM()/rpa->hBar()*lifetime);
double sin_term = sin(flav.DeltaM()/rpa->hBar()*lifetime);
double GX, GR, asymmetry, a;
for(size_t i=0; i<table.size(); i++) {
Hadron_Decay_Channel* hdc = table.at(i);
if(hdc->CPAsymmetryS()==0.0 && hdc->CPAsymmetryC()==0.0) continue;
if(flav.DeltaGamma()==0.0) {
asymmetry = hdc->CPAsymmetryS()*sin_term - hdc->CPAsymmetryC()*cos_term;
}
else {
Complex lambda = hdc->CPAsymmetryLambda();
double l2 = sqr(abs(lambda));
double dG = flav.DeltaGamma()/rpa->hBar();
asymmetry = (2.0*lambda.imag()/(1.0+l2)*sin_term - (1.0-l2)/(1.0+l2)*cos_term)/
(cosh(dG*lifetime/2.0) - 2.0*lambda.real()/(1.0+l2)*sinh(dG*lifetime/2.0));
}
GX = hdc->Width(); // partial width of this DC
GR = table.TotalWidth()-GX; // partial width of other DCs
if(asymmetry>0.0)
a = -1.0*GR/2.0/GX/asymmetry+sqrt(sqr(GR)/4.0/sqr(GX)/sqr(asymmetry)+(GR+GX)/GX);
else if(asymmetry<0.0)
a = -1.0*GR/2.0/GX/asymmetry-sqrt(sqr(GR)/4.0/sqr(GX)/sqr(asymmetry)+(GR+GX)/GX);
else
a = 0.0;
if(anti_at_t0) table.UpdateWidth(hdc, (1.0+a)*GX);
else table.UpdateWidth(hdc, (1.0-a)*GX);
}
return table.Select();
}
}
return ot.Select();
}
ATOOLS::Blob* Mixing_Handler::PerformMixing(Particle* decayer) const
{
// explicit mixing in event record
Flavour flav = decayer->Flav();
string tag = flav.IsAnti() ? flav.Bar().IDName() : flav.IDName();
if(m_model("Mixing_"+tag,0.0)!=0.0 && decayer->Info()!=char('M')) {
double t = DetermineMixingTime(decayer,true)/rpa->hBar();
if(t==0.0) return NULL;
double factor = decayer->Flav().QOverP2();
if(decayer->Flav().IsAnti()) factor = 1.0/factor;
double dG = decayer->Flav().DeltaGamma()*t/4.0;
double dm = decayer->Flav().DeltaM()*t/2.0;
Complex i(0.0,1.0);
double prob_not_mix = sqr(abs(exp(i*dm)*exp(dG)+exp(-i*dm)*exp(-dG)));
double prob_mix = factor*sqr(abs(exp(i*dm)*exp(dG)-exp(-i*dm)*exp(-dG)));
if(prob_mix > ran->Get()*(prob_mix+prob_not_mix)) {
if(decayer->DecayBlob()) {
decayer->DecayBlob()->RemoveOwnedParticles();
delete decayer->DecayBlob();
}
decayer->SetStatus(part_status::decayed);
decayer->SetInfo('m');
Particle* mixed_part = new Particle(0, decayer->Flav().Bar(),
decayer->Momentum(), 'M');
mixed_part->SetFinalMass(decayer->FinalMass());
mixed_part->SetStatus(part_status::active);
mixed_part->SetTime(decayer->Time());
Blob* mixingblob = new Blob();
mixingblob->SetType(btp::Hadron_Mixing);
mixingblob->SetId();
mixingblob->SetStatus(blob_status::inactive);
mixingblob->SetTypeSpec("HADRONS");
mixingblob->AddToInParticles(decayer);
mixingblob->AddToOutParticles(mixed_part);
mixingblob->SetPosition(decayer->ProductionBlob()->Position());
mixingblob->SetStatus(blob_status::needs_hadrondecays);
return mixingblob;
}
}
return NULL;
}
void InitialiseAnalysis()
{
#ifdef USING__ROOT
map<string, string> tags=Read_Write_Base::GlobalTags();
string filepiece;
map<string, string>::const_iterator it=tags.find("TAG_FILE_PIECE");
if(it!=tags.end())
filepiece="."+it->second;
Hadron_Decay_Table* table=hadrons->DecayMap()->FindDecay(mother_flav);
for(int i(0);i<table->size();++i) {
Hadron_Decay_Channel* hdc=table->at(i);
string fname = hdc->FileName();
rootfiles[hdc]=
new TFile(("Analysis/"+fname.erase(fname.length()-4)+filepiece+".root").c_str(),"RECREATE");
TH1D* hist;
int currenthist=0;
int noutp(hdc->NOut());
for(int i=0; i<noutp; i++) {
Flavour flav = hdc->GetDecayProduct(i);
string name = "costheta_"+flav.IDName()+"_"+ToString(i);
string xtitle = "cos(#Theta) of "+flav.RootName();
string ytitle = "#frac{1}{#Gamma} #frac{d#Gamma}{dcos(#Theta)}";
hist = makeTH1D(name, "", 50, -1.0, 1.0, xtitle, ytitle);
ThetaHists[hdc].push_back(hist);
currenthist++;
}
currenthist=0;
for(int i=0; i<noutp; i++) {
Flavour flav = hdc->GetDecayProduct(i);
string name = "E_"+flav.IDName()+"_"+ToString(i);
string xtitle = "E of "+flav.RootName()+" [GeV]";
string ytitle = "#frac{1}{#Gamma} #frac{d#Gamma}{dE} [GeV^{-1}]";
double M = mother_flav.HadMass();
double othermass = 0.0;
for(int k=0; k<noutp; k++) {
if(k!=i) othermass+=hdc->GetDecayProduct(k).HadMass();
}
double Emin = 0.9*flav.HadMass();
double Emax = 1.1/2.0/M*(sqr(M)+sqr(flav.HadMass())-othermass);
hist = makeTH1D(name, "", 50, Emin, Emax, xtitle, ytitle);
EnergyHists[hdc].push_back(hist);
currenthist++;
}
currenthist=0;
for(int i=0; i<noutp; i++) {
if(noutp<3) break;
for(int j=i+1; j<noutp; j++) {
Flavour flav1 = hdc->GetDecayProduct(i);
Flavour flav2 = hdc->GetDecayProduct(j);
string name = "q2_"+flav1.IDName()+"_"+flav2.IDName()+"_"+ToString(i)+ToString(j);
string xtitle = "Inv. Mass q^{2}=(p_{"+flav1.RootName()+"}+p_{"
+flav2.RootName()+"})^{2} [GeV^{2}]";
string ytitle = "#frac{1}{#Gamma} #frac{d#Gamma}{dq^{2}} [GeV^{-2}]";
double othermass = 0.0;
for(int k=0; k<noutp; k++) {
if(k==i || k==j) continue;
othermass+=hdc->GetDecayProduct(k).HadMass();
}
double q2min = 0.0;
double q2max = 1.1*sqr(hdc->GetDecaying().HadMass()-othermass);
hist = makeTH1D(name.c_str(), "", 50, q2min, q2max, xtitle, ytitle);
TwoInvMassHists[hdc].push_back(hist);
currenthist++;
}
}
currenthist=0;
for(int i=0; i<noutp; i++) {
if(noutp<4) break;
for(int j=i+1; j<noutp; j++) {
for(int k=j+1; k<noutp; k++) {
Flavour flav1 = hdc->GetDecayProduct(i);
Flavour flav2 = hdc->GetDecayProduct(j);
Flavour flav3 = hdc->GetDecayProduct(k);
string name = "q2_"+flav1.IDName()+"_"+flav2.IDName()+"_"+flav3.IDName()
+"_"+ToString(i)+ToString(j)+ToString(k);
string xtitle = "Inv. Mass q^{2}=(p_{"+flav1.RootName()+
"}+p_{"+flav2.RootName()+"}+p_{"+flav3.RootName()+"})^{2} [GeV^{2}]";
string ytitle = "#frac{1}{#Gamma} #frac{d#Gamma}{dq^{2}} [GeV^{-2}]";
double othermass = 0.0;
for(int l=0; l<noutp; l++) {
if(l==i || l==j || l==k) continue;
othermass+=hdc->GetDecayProduct(k).HadMass();
}
double q2min = 0.0;
double q2max = 1.1*sqr(hdc->GetDecaying().HadMass());
hist = makeTH1D(name.c_str(), "", 50, q2min, q2max, xtitle, ytitle);
ThreeInvMassHists[hdc].push_back(hist);
currenthist++;
}
}
}
}
#endif
}