void EvtPropSLPole::decay( EvtParticle *p ){
if(! _isProbMaxSet){
EvtId parnum,mesnum,lnum,nunum;
parnum = getParentId();
mesnum = getDaug(0);
lnum = getDaug(1);
nunum = getDaug(2);
double mymaxprob = calcMaxProb(parnum,mesnum,
lnum,nunum,SLPoleffmodel);
setProbMax(mymaxprob);
_isProbMaxSet = true;
}
double minKstMass = EvtPDL::getMinMass(p->getDaug(0)->getId());
double maxKstMass = EvtPDL::getMaxMass(p->getDaug(0)->getId());
EvtIntervalFlatPdf flat(minKstMass, maxKstMass);
EvtPdfGen<EvtPoint1D> gen(flat);
EvtPoint1D point = gen();
double massKst = point.value();
p->getDaug(0)->setMass(massKst);
p->initializePhaseSpace(getNDaug(),getDaugs());
// EvtVector4R p4meson = p->getDaug(0)->getP4();
calcamp->CalcAmp(p,_amp2,SLPoleffmodel);
EvtParticle *mesonPart = p->getDaug(0);
double meson_BWAmp = calBreitWigner(mesonPart, point);
int list[2];
list[0]=0; list[1]=0;
_amp2.vertex(0,0,_amp2.getAmp(list)*meson_BWAmp);
list[0]=0; list[1]=1;
_amp2.vertex(0,1,_amp2.getAmp(list)*meson_BWAmp);
list[0]=1; list[1]=0;
_amp2.vertex(1,0,_amp2.getAmp(list)*meson_BWAmp);
list[0]=1; list[1]=1;
_amp2.vertex(1,1,_amp2.getAmp(list)*meson_BWAmp);
list[0]=2; list[1]=0;
_amp2.vertex(2,0,_amp2.getAmp(list)*meson_BWAmp);
list[0]=2; list[1]=1;
_amp2.vertex(2,1,_amp2.getAmp(list)*meson_BWAmp);
return;
}
EvtComplex EvtMassAmp::amplitude(const EvtPoint1D& p) const
{
// Modified vertex
double m = p.value();
// keep things from crashing..
if ( m< (_vd.mA()+_vd.mB()) ) return EvtComplex(0.,0.);
EvtTwoBodyKine vd(_vd.mA(),_vd.mB(),m);
// Compute mass-dependent width for relativistic propagator
EvtPropBreitWignerRel bw(_prop.m0(),_prop.g0()*_vd.widthFactor(vd));
EvtComplex amp = bw.evaluate(m);
// Birth vertex factors
if(_useBirthFact) {
assert(_vb);
if ( (m+_vb->mB()) < _vb->mAB() ) {
EvtTwoBodyKine vb(m,_vb->mB(),_vb->mAB());
amp *= _vb->phaseSpaceFactor(vb,EvtTwoBodyKine::AB);
amp *= sqrt((vb.p() / _vb->pD()));
if(_useBirthFactFF) {
assert(_vb);
amp *= _vb->formFactor(vb);
}
}
else{
if ( _vb->L() != 0 ) amp=0.;
}
}
// Decay vertex factors
if(_useDeathFact) {
amp *= _vd.phaseSpaceFactor(vd,EvtTwoBodyKine::AB);
amp *= sqrt((vd.p() / _vd.pD()));
}
if(_useDeathFactFF) amp *= _vd.formFactor(vd);
return amp;
}
EvtComplex EvtPropBreitWigner::amplitude(const EvtPoint1D& x) const
{
double m = x.value();
EvtComplex value = sqrt(_g0/EvtConst::twoPi)/(m-_m0-EvtComplex(0.0,_g0/2.));
return value;
}
