bool HepMC2_Interface::Sherpa2HepMC(ATOOLS::Blob_List *const blobs,
HepMC::GenEvent& event, double weight)
{
#ifdef USING__HEPMC2__UNITS
event.use_units(HepMC::Units::GEV,
HepMC::Units::MM);
#endif
event.set_event_number(ATOOLS::rpa->gen.NumberOfGeneratedEvents());
size_t decid(11);
std::map<size_t,size_t> decids;
Blob *sp(blobs->FindFirst(btp::Signal_Process));
if (sp) {
Blob_Data_Base *info((*sp)["Decay_Info"]);
if (info) {
DecayInfo_Vector decs(info->Get<DecayInfo_Vector>());
for (size_t i(0);i<decs.size();++i) decids[decs[i]->m_id]=++decid;
}
}
m_blob2genvertex.clear();
m_particle2genparticle.clear();
HepMC::GenVertex * vertex;
std::vector<HepMC::GenParticle*> beamparticles;
for (ATOOLS::Blob_List::iterator blit=blobs->begin();
blit!=blobs->end();++blit) {
if (Sherpa2HepMC(*(blit),vertex,decids)) {
event.add_vertex(vertex);
if ((*blit)->Type()==ATOOLS::btp::Signal_Process) {
if ((**blit)["NLO_subeventlist"]) {
THROW(fatal_error,"Events containing correlated subtraction events"
+std::string(" cannot be translated into the full HepMC event")
+std::string(" format.\n")
+std::string(" Try 'EVENT_OUTPUT=HepMC_Short' instead."));
}
event.set_signal_process_vertex(vertex);
if((*blit)->NInP()==2) {
kf_code fl1=(*blit)->InParticle(0)->Flav().HepEvt();
kf_code fl2=(*blit)->InParticle(1)->Flav().HepEvt();
double x1=(*blit)->InParticle(0)->Momentum()[0]/rpa->gen.PBeam(0)[0];
double x2=(*blit)->InParticle(1)->Momentum()[0]/rpa->gen.PBeam(1)[0];
double q(0.0), p1(0.0), p2(0.0);
Blob_Data_Base *facscale((**blit)["Factorisation_Scale"]);
if (facscale) q=sqrt(facscale->Get<double>());
Blob_Data_Base *xf1((**blit)["XF1"]);
Blob_Data_Base *xf2((**blit)["XF2"]);
if (xf1) p1=xf1->Get<double>();
if (xf2) p2=xf2->Get<double>();
HepMC::PdfInfo pdfinfo(fl1, fl2, x1, x2, q, p1, p2);
event.set_pdf_info(pdfinfo);
}
}
else if ((*blit)->Type()==ATOOLS::btp::Beam ||
(*blit)->Type()==ATOOLS::btp::Bunch) {
for (HepMC::GenVertex::particles_in_const_iterator
pit=vertex->particles_in_const_begin();
pit!=vertex->particles_in_const_end(); ++pit) {
if ((*pit)->production_vertex()==NULL) {
beamparticles.push_back(*pit);
}
}
}
}
}
if (beamparticles.size()==2) {
event.set_beam_particles(beamparticles[0],beamparticles[1]);
}
std::vector<double> weights;
weights.push_back(weight);
if (sp) {
Blob_Data_Base *info((*sp)["MEWeight"]);
if (!info) THROW(fatal_error,"Missing weight info.");
double meweight(info->Get<double>());
weights.push_back(meweight);
Blob_Data_Base *ofni((*sp)["Weight_Norm"]);
if (!ofni) THROW(fatal_error,"Missing weight normalisation.");
double weightnorm(ofni->Get<double>());
weights.push_back(weightnorm);
ofni=(*sp)["Trials"];
if (!ofni) THROW(fatal_error,"Missing nof trials.");
double trials(ofni->Get<double>());
weights.push_back(trials);
}
event.weights()=weights;
return true;
}
bool HepMC2_Interface::Sherpa2ShortHepMC(ATOOLS::Blob_List *const blobs,
HepMC::GenEvent& event, double weight)
{
#ifdef USING__HEPMC2__UNITS
event.use_units(HepMC::Units::GEV,
HepMC::Units::MM);
#endif
event.set_event_number(ATOOLS::rpa->gen.NumberOfGeneratedEvents());
HepMC::GenVertex * vertex=new HepMC::GenVertex();
std::vector<HepMC::GenParticle*> beamparticles;
std::vector<std::pair<HepMC::FourVector,int> > beamparts,
remnantparts1, remnantparts2;
Blob *sp(blobs->FindFirst(btp::Signal_Process));
NLO_subevtlist* subevtlist(NULL);
ME_wgtinfo* wgtinfo(0);
if (sp) {
Blob_Data_Base* seinfo=(*sp)["ME_wgtinfo"];
if (seinfo) wgtinfo=seinfo->Get<ME_wgtinfo*>();
Blob_Data_Base * bdb((*sp)["NLO_subeventlist"]);
if (bdb) subevtlist=bdb->Get<NLO_subevtlist*>();
}
for (ATOOLS::Blob_List::iterator blit=blobs->begin();
blit!=blobs->end();++blit) {
Blob* blob=*blit;
for (int i=0;i<blob->NInP();i++) {
if (blob->InParticle(i)->ProductionBlob()==NULL) {
Particle* parton=blob->InParticle(i);
ATOOLS::Vec4D mom = parton->Momentum();
HepMC::FourVector momentum(mom[1],mom[2],mom[3],mom[0]);
HepMC::GenParticle* inpart =
new HepMC::GenParticle(momentum,parton->Flav().HepEvt(),2);
vertex->add_particle_in(inpart);
// distinct because SHRIMPS has no bunches for some reason
if (blob->Type()==btp::Beam || blob->Type()==btp::Bunch) {
beamparticles.push_back(inpart);
beamparts.push_back(std::make_pair(momentum,parton->Flav().HepEvt()));
}
}
}
for (int i=0;i<blob->NOutP();i++) {
if (blob->OutParticle(i)->DecayBlob()==NULL) {
Particle* parton=blob->OutParticle(i);
ATOOLS::Vec4D mom = parton->Momentum();
HepMC::FourVector momentum(mom[1],mom[2],mom[3],mom[0]);
HepMC::GenParticle* outpart =
new HepMC::GenParticle(momentum,parton->Flav().HepEvt(),1);
vertex->add_particle_out(outpart);
if (blob->Type()==btp::Beam) {
if (mom[3]>0)
remnantparts1.push_back(std::make_pair(momentum,
parton->Flav().HepEvt()));
else if (mom[3]<0)
remnantparts2.push_back(std::make_pair(momentum,
parton->Flav().HepEvt()));
else THROW(fatal_error,"Ill defined beam remnants.");
}
}
}
if ((*blit)->Type()==ATOOLS::btp::Signal_Process) {
if((*blit)->NInP()==2) {
kf_code fl1=(*blit)->InParticle(0)->Flav().HepEvt();
kf_code fl2=(*blit)->InParticle(1)->Flav().HepEvt();
double x1=(*blit)->InParticle(0)->Momentum()[0]/rpa->gen.PBeam(0)[0];
double x2=(*blit)->InParticle(1)->Momentum()[0]/rpa->gen.PBeam(1)[0];
double q(0.0), p1(0.0), p2(0.0);
Blob_Data_Base *facscale((**blit)["Factorisation_Scale"]);
if (facscale) q=sqrt(facscale->Get<double>());
Blob_Data_Base *xf1((**blit)["XF1"]);
Blob_Data_Base *xf2((**blit)["XF2"]);
if (xf1) p1=xf1->Get<double>();
if (xf2) p2=xf2->Get<double>();
HepMC::PdfInfo pdfinfo(fl1, fl2, x1, x2, q, p1, p2);
event.set_pdf_info(pdfinfo);
}
}
}
event.add_vertex(vertex);
if (beamparticles.size()==2) {
event.set_beam_particles(beamparticles[0],beamparticles[1]);
}
std::vector<double> weights; weights.push_back(weight);
if (sp && !subevtlist) {
Blob_Data_Base *info;
info=((*sp)["MEWeight"]);
if (!info) THROW(fatal_error,"Missing weight info.");
double meweight(info->Get<double>());
weights.push_back(meweight);
info=((*sp)["Weight_Norm"]);
if (!info) THROW(fatal_error,"Missing weight normalisation.");
double weightnorm(info->Get<double>());
weights.push_back(weightnorm);
info=(*sp)["Trials"];
if (!info) THROW(fatal_error,"Missing nof trials.");
double trials(info->Get<double>());
weights.push_back(trials);
//alphaS value && power
double rscale2 = (*sp)["Renormalization_Scale"]->Get<double>();
double alphaS = MODEL::s_model->ScalarFunction("alpha_S",rscale2);
event.set_alphaQCD(alphaS);
double aSpower = ((*sp)["OQCD"])->Get<int>();
weights.push_back(aSpower);
if (wgtinfo) {
//dump weight_0
weights.push_back(wgtinfo->m_w0);
//dump number of usr weights
weights.push_back(wgtinfo->m_nx);
//store xprimes
weights.push_back(wgtinfo->m_y1);
weights.push_back(wgtinfo->m_y2);
//fill in usr weights
for (int i=0;i<wgtinfo->m_nx;i++) {
weights.push_back(wgtinfo->p_wx[i]);
}
}
}
event.weights()=weights;
if (subevtlist) {
// build GenEvent for all subevts (where only the signal is available)
// use stored beam & remnant particles from above
// sub->m_flip==1 -> momenta need to be inverted for analyses
for (size_t i(0);i<subevtlist->size();++i) {
NLO_subevt * sub((*subevtlist)[i]);
if (sub->m_result==0.) continue;
HepMC::GenVertex * subvertex(new HepMC::GenVertex());
HepMC::GenEvent * subevent(new HepMC::GenEvent());
// assume that only 2->(n-2) processes
HepMC::GenParticle *beam[2];
if (beamparts.size()==2) {
for (size_t j(0);j<beamparts.size();++j) {
beam[j] = new HepMC::GenParticle(beamparts[j].first,
beamparts[j].second,2);
subvertex->add_particle_in(beam[j]);
}
}
else {
const ATOOLS::Vec4D *mom(sub->p_mom);
const ATOOLS::Flavour *fl(sub->p_fl);
for (size_t j(0);j<2;++j) {
HepMC::FourVector momentum;
momentum.set( mom[j][1], mom[j][2], mom[j][3],mom[j][0]);
ATOOLS::Flavour flc(fl[j]);
HepMC::GenParticle* inpart
= new HepMC::GenParticle(momentum,flc.HepEvt(),2);
subvertex->add_particle_in(inpart);
}
}
const ATOOLS::Vec4D *mom(sub->p_mom);
const ATOOLS::Flavour *fl(sub->p_fl);
for (size_t j(2);j<(*subevtlist)[i]->m_n;++j) {
HepMC::FourVector momentum;
momentum.set( mom[j][1], mom[j][2], mom[j][3],mom[j][0]);
ATOOLS::Flavour flc(fl[j]);
HepMC::GenParticle* outpart
= new HepMC::GenParticle(momentum,flc.HepEvt(),1);
subvertex->add_particle_out(outpart);
}
// if beamremnants are present:
// scale beam remnants of real event for energy momentum conservation :
// flavours might not add up properly for sub events,
// but who cares. they go down the beam pipe.
// also assume they are all massless :
// this will give momentum conservation violations
// which are collider dependent only
//
// for real event (as constructed in BRH) :
//
// P = p + \sum r_i with P^2 = m^2 and r_i^2 = p^2 = 0
//
// further P = ( P^0 , 0 , 0 , P^z )
// p = ( p , 0 , 0 , p )
// r_i = ( r_i , 0 , 0 , r_i )
//
// => P^0 = p + \sum r_i
// P^z = \sqrt{(P^0)^2 - m^2} < p + \sum r_i
//
// in a mass-symmetric collider, the excess is the same for both beams
// ensuring momentum conservation
//
// for sub event (constructed here):
//
// P = p~ + \sum r_i~ = p~ + \sum u*r_i
//
// where u = ( P^0 - p^0~ ) / \sum r_i^0
//
// again, the r_i~ = u*r_i are constructed such that
//
// => P^0 = p~ + \sum u*r_i
// P^z = \sqrt{(P^0)^2 - m^2} < p~ + \sum u*r_i = p + \sum r_i
//
// leading to the same momentum conservation violations per beam
//
if (remnantparts1.size()!=0 && remnantparts2.size()!=0) {
double res1(0.),res2(0.);
for (size_t j(0);j<remnantparts1.size();++j) {
res1+=remnantparts1[j].first.e();
}
for (size_t j(0);j<remnantparts2.size();++j) {
res2+=remnantparts2[j].first.e();
}
ATOOLS::Vec4D hardparton[2];
for (size_t j(0);j<2;++j) {
hardparton[j]=ATOOLS::Vec4D(mom[j][0],Vec3D( mom[j]));
}
// incoming partons might need to be flipped due to particle sorting
bool flip(hardparton[0][3]<0);
double u1((beamparts[0].first.e()-hardparton[flip?1:0][0])/res1);
double u2((beamparts[1].first.e()-hardparton[flip?0:1][0])/res2);
// filling
for (size_t j(0);j<remnantparts1.size();++j) {
HepMC::FourVector momentum(u1*remnantparts1[j].first.px(),
u1*remnantparts1[j].first.py(),
u1*remnantparts1[j].first.pz(),
u1*remnantparts1[j].first.e());
HepMC::GenParticle* outpart
= new HepMC::GenParticle(momentum,remnantparts1[j].second,1);
subvertex->add_particle_out(outpart);
}
for (size_t j(0);j<remnantparts2.size();++j) {
HepMC::FourVector momentum(u2*remnantparts2[j].first.px(),
u2*remnantparts2[j].first.py(),
u2*remnantparts2[j].first.pz(),
u2*remnantparts2[j].first.e());
HepMC::GenParticle* outpart
= new HepMC::GenParticle(momentum,remnantparts2[j].second,1);
subvertex->add_particle_out(outpart);
}
if (beamparticles.size()==2) {
subevent->set_beam_particles(beam[0],beam[1]);
}
}
subevent->add_vertex(subvertex);
// not enough info in subevents to set PDFInfo properly,
// so set only flavours, x1, x2, and q from the Signal_Process
HepMC::PdfInfo subpdfinfo(*event.pdf_info());
double q = sqrt(sub->m_mu2[stp::fac]);
if (q!=0. && q != subpdfinfo.scalePDF())
subpdfinfo.set_scalePDF(q);
if (sub->m_xf1) subpdfinfo.set_pdf1(sub->m_xf1);
if (sub->m_xf2) subpdfinfo.set_pdf2(sub->m_xf2);
subevent->set_pdf_info(subpdfinfo);
// add weight
std::vector<double> subweight; subweight.push_back(sub->m_result);
Blob_Data_Base *info;
info=((*sp)["MEWeight"]);
if (!info) THROW(fatal_error,"Missing weight info.");
double meweight(info->Get<double>());
subweight.push_back(meweight);
info=((*sp)["Weight_Norm"]);
if (!info) THROW(fatal_error,"Missing weight normalisation.");
double weightnorm(info->Get<double>());
subweight.push_back(weightnorm);
info=(*sp)["Trials"];
if (!info) THROW(fatal_error,"Missing nof trials.");
double trials(info->Get<double>());
subweight.push_back(trials);
//alphaS value && power
double alphaS = MODEL::s_model->ScalarFunction("alpha_S",sub->m_mu2[stp::ren]);
subevent->set_alphaQCD(alphaS);
double aSpower = ((*sp)["OQCD"])->Get<int>();
subweight.push_back(aSpower);
subweight.push_back(sub->m_mewgt);
if (wgtinfo) {
//dump number of usr weights
subweight.push_back(wgtinfo->m_nx);
//store xprimes
subweight.push_back(wgtinfo->m_y1);
subweight.push_back(wgtinfo->m_y2);
//fill in usr weights
for (int i=0;i<wgtinfo->m_nx;i++) {
subweight.push_back(wgtinfo->p_wx[i]);
}
}
//
subevent->weights()=subweight;
// set the event number (could be used to identify correlated events)
subevent->set_event_number(ATOOLS::rpa->gen.NumberOfGeneratedEvents());
m_subeventlist.push_back(subevent);
}
}
return true;
}