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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/DISFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/DISKinematics.hh"
#include "Rivet/Projections/DISLepton.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Measurement of inclusive production of D* mesons both with and without dijet production in DIS collisions (H1)
class H1_2007_I736052 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(H1_2007_I736052);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
declare(DISLepton(), "Lepton");
declare(DISKinematics(), "Kinematics");
const FinalState fs;
declare(fs, "FS");
const UnstableParticles ufs;
declare(ufs, "UFS");
double jet_radius = 1.0;
const DISFinalState DISfs(DISFinalState::BoostFrame::BREIT);
declare(FastJets(DISfs, fastjet::JetAlgorithm::kt_algorithm, fastjet::RecombinationScheme::Et_scheme, jet_radius), "jets_fs");
Histo1DPtr tmp;
book(_h["411"], 4, 1, 1);
book(_h["511"], 5, 1, 1);
book(_h["611"], 6, 1, 1);
book(_h["711"], 7, 1, 1);
book(_h["811"], 8, 1, 1);
book(_h["911"], 9, 1, 1);
_h_binned["Q2xbj"].add( 2., 4.22, book(_h["1011"], 10, 1, 1));
_h_binned["Q2xbj"].add( 4.22, 10., book(_h["1111"], 11, 1, 1));
_h_binned["Q2xbj"].add( 10., 17.8, book(_h["1211"], 12, 1, 1));
_h_binned["Q2xbj"].add( 17.8, 31.6, book(_h["1311"], 13, 1, 1));
_h_binned["Q2xbj"].add( 31.6, 100., book(_h["1411"], 14, 1, 1));
book(_h["1511"], 15, 1, 1);
book(_h["1611"], 16, 1, 1);
book(_h["1711"], 17, 1, 1);
book(_h["1811"], 18, 1, 1);
book(_h["1911"], 19, 1, 1);
book(_h["2011"], 20, 1, 1);
book(_h["2111"], 21, 1, 1);
book(_h["2211"], 22, 1, 1);
_h_binned["Q2phi"].add( 2., 10., book(tmp, 23, 1, 1));
_h_binned["Q2phi"].add( 10., 100., book(tmp, 24, 1, 1));
book(_h["2511"], 25, 1, 1);
book(_h["2611"], 26, 1, 1);
book(_h["2711"], 27, 1, 1);
book(_h["2811"], 28, 1, 1);
_h_binned["Q2xgam"].add( 2., 5., book(_h["2911"], 29, 1, 1));
_h_binned["Q2xgam"].add( 5., 10., book(_h["2912"], 29, 1, 2));
_h_binned["Q2xgam"].add( 10., 100., book(_h["2913"], 29, 1, 3));
book(_h["3011"], 30, 1, 1);
_h_binned["Q2xglue"].add( 2., 5., book(_h["3111"], 31, 1, 1));
_h_binned["Q2xglue"].add( 5., 10., book(_h["3112"], 31, 1, 2));
_h_binned["Q2xglue"].add( 10., 100., book(_h["3113"], 31, 1, 3));
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
const size_t numParticles = fs.particles().size();
Jets jets_fs = apply<JetAlg>(event, "jets_fs").jetsByPt(); // Jets with cut on eta
double jet_radius = 1.0;
const UnstableParticles& ufs = apply<UnstableFinalState>(event, "UFS");
if (numParticles < 2){
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
Particles Dstar;
for(const Particle& p : filter_select(ufs.particles(), Cuts::pT > 1.5*GeV and Cuts::pT < 15*GeV and Cuts::abseta < 1.5 and Cuts::abspid==413)) {
Dstar.push_back(p);
}
if(Dstar.size() == 0){ // Cut on Dstar
MSG_DEBUG("Failed Dstar cut");
vetoEvent;
}
const DISKinematics& dk = applyProjection<DISKinematics>(event, "Kinematics");
const DISLepton& dl = applyProjection<DISLepton>(event,"Lepton");
double Q2 = dk.Q2();
double y = dk.y();
if(y < 0.05 or y > 0.7 or Q2 < 2 or Q2 > 100){ // Cut on event kinematics
MSG_DEBUG("Failed kinematics cut");
vetoEvent;
}
// Extract the particles other than the lepton
Particles particles;
particles.reserve(fs.particles().size());
ConstGenParticlePtr dislepGP = dl.out().genParticle();
for (const Particle& p : fs.particles()) {
ConstGenParticlePtr loopGP = p.genParticle();
if (loopGP == dislepGP) continue;
particles.push_back(p);
}
const LorentzTransform hcmboost = dk.boostHCM(); // Hadron cm system
const LorentzTransform breitboost = dk.boostBreit(); //Breit system
const LorentzTransform labboost = breitboost.inverse(); //Labsystem from Breit
double xbj = dk.x();
double W2 = dk.W2();
double pT_cm(0);
_h["411"] -> fill(Q2);
_h["511"] -> fill(xbj);
_h["611"] -> fill(std::sqrt(W2));
_h_binned["Q2xbj"].fill(Q2, xbj);
for(const Particle& p : Dstar){
_h["711"] -> fill(p.pT());
_h["811"] -> fill(p.eta());
_h["911"] -> fill((p.E() - p.pz())/(2*y*dk.beamLepton().E()));
const FourMomentum hcmMom = hcmboost.transform(p.momentum());
if(pT_cm < hcmMom.pT()) pT_cm = hcmMom.pT();
if(hcmMom.pT() > 2){ //Cut for 1711 and 1811 histograms
_h["1711"] -> fill(p.pT());
_h["1811"] -> fill(p.eta());
}
}
if(pT_cm > 2){
_h["1511"] -> fill(Q2);
_h["1611"] -> fill(xbj);
}
/*
FourMomentum gammaZ;
const FourMomentum leptonOUT = dl.out();
const FourMomentum leptonIN = dl.in();
gammaZ = leptonIN - leptonOUT ;
cout << " LAB: gammaZ " << gammaZ << endl;
cout << " HCM: gammaZ " << hcmboost.transform(gammaZ) << endl;
cout << " LAB: p-beam " << dk.beamHadron().momentum() << endl;
cout << " HCM: p-beam " << hcmboost.transform(dk.beamHadron().momentum()) << endl;
cout << " Breit: gammaZ " << breitboost.transform(gammaZ) << endl;
cout << " Breit: p-beam " << breitboost.transform(dk.beamHadron().momentum()) << endl;
for(ConstGenParticlePtr p: HepMCUtils::particles(event.genEvent())) {
const PdgId pid = p->pdg_id();
if (abs(pid) == 23) {
cout<< " HEPMC: photon/Z " << p->momentum() << endl;
}
}
*/
bool two_jets_with_cut(false);
Jets jet_cut;
for(const Jet& j : jets_fs){
double etalab = labboost.transform(j.momentum()).eta() ;
if(j.momentum().Et() > 3 and etalab > -1 and etalab < 2.5){ // Cut on jet energy in Breit sys.
jet_cut.push_back(j); }
}
if(jet_cut.size() >= 2 && jet_cut[0].momentum().Et() > 4 ) two_jets_with_cut = true;
double delta_phi;
FourMomentum jet1;
FourMomentum jet2;
Jets jet_DJ, jet_OJ;
bool found_DJ(false), found_OJ(false);
//cout << " check D and other jets " << endl;
if(two_jets_with_cut){
jet1 = jet_cut[0].momentum(); // momentum of jet #1 in Breit sys.
jet2 = jet_cut[1].momentum(); // momentum of jet #2 in Breit sys.
delta_phi = deltaPhi(jet1,jet2)/degree ;
_h["1911"] -> fill(Q2);
_h["2011"] -> fill(xbj);
_h["2111"] -> fill(jet_cut[0].momentum().Et()/GeV);
_h["2211"] -> fill(FourMomentum(jet1+jet2).mass()/GeV); // Jets invariant mass in Breit sys.
//cout << " dphi " << delta_phi <<" " << deltaPhi(jet_cut[0].momentum(),jet_cut[1].momentum())/degree << endl;
_h_binned["Q2phi"].fill(Q2, delta_phi);
for (const Jet& jet : jet_cut) {
for(const Particle & p : Dstar) {
if(deltaR(breitboost.transform(p.momentum()), jet.momentum()) < jet_radius ) {
jet_DJ.push_back(jet);
found_DJ = true;
}
else {
jet_OJ.push_back(jet);
found_OJ = true;
}
}
if( found_DJ && found_OJ ) break ;
}
//cout << " DJ jet size " << jet_DJ.size() << "found Dj " << found_DJ << " OJ jet size " << jet_DJ.size() << " found OJ " << found_OJ << endl;
if(jet_DJ.size()>0 && jet_OJ.size()>0 )
{
double eta_DJ_breit = jet_DJ[0].momentum().eta();
double eta_OJ_breit = jet_OJ[0].momentum().eta();
_h["2511"] -> fill(eta_DJ_breit);
_h["2611"] -> fill(eta_OJ_breit);
_h["2711"] -> fill(abs(eta_DJ_breit - eta_OJ_breit));
double x_gamma, x_gluon;
double E_star_p_z_star(0); // E() - pz() sum for for x_gamma in \gamma p cm
double E_star_p_z_had(0);
// for jets in had cms: boost first back to lab and then to hcm
Jet jet_DJ_hcm, jet_OJ_hcm;
jet_DJ_hcm = hcmboost.transform(labboost(jet_DJ[0].momentum()));
jet_OJ_hcm = hcmboost.transform(labboost(jet_OJ[0].momentum()));
// Need to change sign: by default hcmboost has gamma* in +z dir, and p in -z dir, but here we need: gamma* -in -z and proton in +z.
// so - -> +: watch out for E-pz -> E+pz and exp(eta_OJ_hcm) -> exp(-eta_OJ_hcm)
// this was already noted in H1_2007_I746380.cc
double Et_DJ_hcm = jet_DJ_hcm.Et();
double eta_DJ_hcm = jet_DJ_hcm.eta();
double Et_OJ_hcm = jet_OJ_hcm.Et();
double eta_OJ_hcm = jet_OJ_hcm.eta();
//observed fraction of the photon momentum carried by the parton involved in the hard subprocess
E_star_p_z_star = jet_DJ_hcm.momentum().E() + jet_DJ_hcm.momentum().pz() + jet_OJ_hcm.momentum().E() + jet_OJ_hcm.momentum().pz();
for (size_t ip1 = 0; ip1 < particles.size(); ++ip1) {
const Particle& p = particles[ip1];
E_star_p_z_had += (hcmboost.transform(p.momentum())).E() + (hcmboost.transform(p.momentum())).pz();
}
x_gamma = E_star_p_z_star/E_star_p_z_had;
x_gluon = (Et_OJ_hcm*exp(-eta_OJ_hcm) + Et_DJ_hcm*exp(-eta_DJ_hcm))/(2.*hcmboost.transform(dk.beamHadron().momentum()).E());
//observed fraction of the proton momentum carried by the gluon
//cout << " xgamm " << x_gamma << " x_glu " << x_gluon << endl;
_h["2811"] -> fill(x_gamma);
_h_binned["Q2xgam"].fill(Q2, x_gamma);
_h["3011"] -> fill(log10(x_gluon));
_h_binned["Q2xglue"].fill(Q2, log10(x_gluon));
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
double norm = crossSection()/nanobarn/sumW();
//double norm = crossSection()/nanobarn/sumOfWeights();
//cout << " SumOfWeights " << sumW() << " "<< sumOfWeights() << endl;
scale(_h["411"], norm);
scale(_h["511"], norm);
scale(_h["611"], norm);
scale(_h["711"], norm);
scale(_h["811"], norm);
scale(_h["911"], norm);
_h_binned["Q2xbj"].scale(norm, this);
scale(_h["1511"], norm);
scale(_h["1611"], norm);
scale(_h["1711"], norm);
scale(_h["1811"], norm);
scale(_h["1911"], norm);
scale(_h["2011"], norm);
scale(_h["2111"], norm);
scale(_h["2211"], norm);
_h_binned["Q2phi"].scale(norm*180./M_PI, this);
scale(_h["2511"], norm);
scale(_h["2611"], norm);
scale(_h["2711"], norm);
scale(_h["2811"], norm);
_h_binned["Q2xgam"].scale(norm, this);
scale(_h["3011"], norm);
// new scaling needed, since x bins are in log10(x)
vector<YODA::HistoBin1D>& bins = _h["3011"] -> bins();
for (auto & b : bins) {
double scale_new = b.xWidth()/pow(10,b.xWidth()) ;
// jacobian d log10/dx = dlog10 / dlogx dlogx/dx = 2.3026 /x
double factor = pow(10,b.xMid())/2.3026;
b.scaleW(scale_new/factor) ;
}
_h_binned["Q2xglue"].scale(norm, this);
// new scaling needed, since x bins are in log10(x)
for (Histo1DPtr histo : _h_binned["Q2xglue"].histos()) {
vector<YODA::HistoBin1D>& bins = histo -> bins();
for (auto & b : bins) {
double scale_new = b.xWidth()/pow(10,b.xWidth()) ;
// jacobian d log10/dx = dlog10 / dlogx dlogx/dx = 2.3026 /x
double factor = pow(10,b.xMid())/2.3026;
b.scaleW(scale_new/factor) ;
}
}
}
///@}
/// @name Histograms
///@{
map<string, Histo1DPtr> _h;
map<string, Profile1DPtr> _p;
map<string, CounterPtr> _c;
map<string, BinnedHistogram> _h_binned;
///@}
};
RIVET_DECLARE_PLUGIN(H1_2007_I736052);
}
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