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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/DISKinematics.hh"
#include "Rivet/Projections/DISLepton.hh"
#include "Rivet/Projections/DISFinalState.hh"
namespace Rivet {
/// @brief Measurement of beauty production at HERA using events with muons and jets
class H1_2005_I676166 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(H1_2005_I676166);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(Cuts::abspid == PID::MUON), "muons");
declare(DISKinematics(), "Kinematics");
const DISLepton dl;
//declare(dl, "Lepton");
declare(dl.remainingFinalState(), "FS");
// DIS events: final state particles boosted to Breit frame then clustered
// using FastJet KT algorithm with jet radius parameter 1 , pT recombination scheme
const DISFinalState DISfs(DISFinalState::BoostFrame::BREIT);
declare(FastJets(DISfs, fastjet::JetAlgorithm::kt_algorithm, fastjet::RecombinationScheme::pt_scheme, 1.0,
JetAlg::Muons::ALL, JetAlg::Invisibles::NONE, nullptr), "DISjets");
// Photoproduction events: final state particles in lab frame then clustered
// using FastJet KT algorithm with jet radius parameter 1 , pT recombination scheme
const DISFinalState PHOfs(DISFinalState::BoostFrame::LAB);
declare(FastJets(PHOfs, fastjet::JetAlgorithm::kt_algorithm, fastjet::RecombinationScheme::pt_scheme, 1.0,
JetAlg::Muons::ALL, JetAlg::Invisibles::NONE, nullptr), "PHOjets");
// Photoproduction (Table 4)
book(_h["PHO_eta_mu"], 1, 1, 1);
book(_h["PHO_pT_mu"], 2, 1, 1);
book(_h["PHO_pT_jet"], 3, 1, 1);
book(_h["PHO_x_obs_gamma"], 4, 1, 1);
// Electroproduction (Table 5)
book(_h["DIS_Q^2"], 5, 1, 1);
book(_h["DIS_x"], 6, 1, 1);
book(_h["DIS_eta_mu"], 7, 1, 1);
book(_h["DIS_pT_mu"], 8, 1, 1);
book(_h["DIS_pT_jet_Breit"], 9, 1, 1);
isDIS = false;
nPHO = 0;
nDIS = 0;
nVeto0 = 0;
nVeto1 = 0;
nVeto2 = 0;
nVeto3 = 0;
nVeto4 = 0;
nVeto5 = 0;
nVeto6 = 0;
nVeto7 = 0;
}
/// Perform the per-event analysis
void analyze(const Event& event) {
isDIS = false;
//First Lorentz invariant quantities in Lab frame
DISKinematics dis = apply<DISKinematics>(event, "Kinematics");
//const DISLepton& dl = apply<DISLepton>(event,"Lepton");
double Q2 = dis.Q2()/GeV2;
double x = dis.x();
double y = dis.y();
//after x_g
//calculated from mass of
// Separate into DIS and PHO regimes else veto
if (Q2 < 1 && inRange(y, 0.2, 0.8)) {
isDIS = false;
++nPHO;
} else if (inRange(Q2, 2.0, 100) && inRange(y, 0.1, 0.7)) {
isDIS = true;
++nDIS;
} else {
vetoEvent;
}
++nVeto0;
// Extract the particles other than the lepton
Particles particles = apply<FinalState>(event, "FS").particles();
// Get Lorentz transforms for Breit Boost and Lab Boost
const LorentzTransform breitboost = dis.boostBreit();
const LorentzTransform hcmboost = dis.boostHCM(); // Hadron cm system
const LorentzTransform labboost = breitboost.inverse();
// If DIS regime, cluster in Breit frame. If PHO regime, cluster in lab frame
// Apply jet cuts for relevant regime
Jets DISjets, PHOjets;
Jets cutJetsDIS, cutJetsPHO;
Jet pjet1, pjet2;
if (isDIS) {
DISjets = apply<FastJets>(event, "DISjets").jetsByPt(Cuts::pT > 6*GeV);
// Cut on Pseudorapidity in lab frame
for (vector<int>::size_type i=0; i<DISjets.size(); i++){
const FourMomentum LabMom = labboost.transform(DISjets[i]);
// eta cut is in lab frame
double etaDISJet =abs(LabMom.eta());
if(etaDISJet < 2.5 ){
cutJetsDIS.push_back(DISjets[i]);
}
}
// Apply number of jet cuts: in DIS at least one jet is needed
if (cutJetsDIS.size()<1) vetoEvent;
++nVeto1;
} else {
PHOjets = apply<FastJets>(event, "PHOjets").jetsByPt(Cuts::pT > 6*GeV);
// Cut on Pseudorapidity
for(vector<int>::size_type i=0; i<PHOjets.size(); i++){
double etaPHOJet = PHOjets[i].eta();
if(abs(etaPHOJet) < 2.5 ){
cutJetsPHO.push_back(PHOjets[i]);
}
}
// Apply number of jet cuts: in phtotproduction at least 2 jets are needed
if(cutJetsPHO.size()<2) vetoEvent;
++nVeto2;
// Ensure 1st (2nd) hardest jets have pT > 7 (6) GeV
pjet1 = cutJetsPHO[0];
pjet2 = cutJetsPHO[1];
if(!(pjet1.pT()>7 || pjet2.pT()>7) ){
vetoEvent;
}
++nVeto3;
}
// Apply muon cuts in relevant regime
const Particles& all_muons = apply<FinalState>(event, "muons").particlesByPt();
Particles DIS_muons_cut;
Particles PHO_muons_cut;
// Apply muon eta / pT cuts
const Particles DIS_muons = filter_select(all_muons, [](const Particle& m) {
return m.eta() > -0.75 && m.eta() < 1.15 && m.pT() > 2.5*GeV; });
const Particles PHO_muons = filter_select(all_muons, [](const Particle& m) {
return m.eta() > -0.55 && m.eta() < 1.10 && m.pT() > 2.5*GeV; });
if (isDIS) {
// Veto event events with no muons
if (DIS_muons.size() == 0) vetoEvent;
++nVeto4;
}
else {
// Veto event events with no muons
if (PHO_muons.size() == 0) vetoEvent;
++nVeto5;
}
// Calculate fraction of photon energy entering the hard interaction observable
double sumJet1 = 0;
double sumJet2 = 0;
double sumAllHad = 0;
double x_gamma;
if (!isDIS) {
//const Particles& hadfs = apply<HadronicFinalState>(event, "HFS").particles();
//for (const Particle& h : hadfs) {
for (size_t ip1 = 0; ip1 < particles.size(); ++ip1) {
Particle& h = particles[ip1];
FourMomentum hcmMom = hcmboost.transform(h.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.
sumAllHad += (hcmMom.E() + hcmMom.pz());
if ( deltaR(h, pjet1) <= 1.0 ) {
sumJet1 += (hcmMom.E() + hcmMom.pz());
}
else if ( deltaR(h, pjet2) <= 1.0 ) {
sumJet2 += (hcmMom.E() + hcmMom.pz());
}
}
//sumJet1 = hcmboost.transform(pjet1).E() + hcmboost.transform(pjet1).pz();
//sumJet2 = hcmboost.transform(pjet2).E() + hcmboost.transform(pjet2).pz();
x_gamma = (sumJet1 + sumJet2)/sumAllHad;
}
// Fill histos
if (isDIS ) {
for (const Particle& m : DIS_muons) {
_h["DIS_pT_mu"] -> fill(m.pT());
_h["DIS_eta_mu"] -> fill(m.eta());
}
_h["DIS_pT_jet_Breit"] -> fill(cutJetsDIS[0].pT()/GeV);
_h["DIS_Q^2"] -> fill(Q2);
_h["DIS_x"] -> fill(log10(x));
} else {
for (const Particle& m : PHO_muons) {
_h["PHO_pT_mu"] -> fill(m.pT());
_h["PHO_eta_mu"] -> fill(m.eta());
}
_h["PHO_pT_jet"] -> fill(cutJetsPHO[0].pT());
_h["PHO_x_obs_gamma"] -> fill(x_gamma);
}
}
/// Normalise histograms etc., after the run
void finalize() {
double normpb = crossSection()/picobarn/sumW();
scale(_h["PHO_eta_mu"], normpb);
scale(_h["PHO_pT_mu"], normpb);
scale(_h["PHO_pT_jet"], normpb);
scale(_h["PHO_x_obs_gamma"], normpb);
scale(_h["DIS_Q^2"], normpb);
scale(_h["DIS_x"], normpb);
scale(_h["DIS_eta_mu"], normpb);
scale(_h["DIS_pT_mu"], normpb);
scale(_h["DIS_pT_jet_Breit"], normpb);
MSG_DEBUG("Events passing Q2/y cuts = " << nVeto0 );
MSG_DEBUG("PHO events = " << nPHO );
MSG_DEBUG("DIS events = " << nDIS );
MSG_DEBUG("DIS Events passing number of jets cuts= " << nVeto1 );
MSG_DEBUG("PHO Events passing number of jets cuts= " << nVeto2 );
MSG_DEBUG("PHO Events passing pT jet cuts= " << nVeto3 );
MSG_DEBUG("DIS Events passing one muon cut= " << nVeto4 );
MSG_DEBUG("PHO Events passing one muon cut= " << nVeto5 );
MSG_DEBUG("DIS Events passing muon in jet cut = " << nVeto6 );
MSG_DEBUG("PHO Events passing muon in jet cut = " << nVeto7 );
}
/// @}
private:
/// @name Histograms
/// @{
map<string, Histo1DPtr> _h;
map<string, Profile1DPtr> _p;
map<string, CounterPtr> _c;
/// @}
bool isDIS;
int nPHO, nDIS;
int nVeto0, nVeto1, nVeto2, nVeto3, nVeto4, nVeto5, nVeto6, nVeto7;
};
RIVET_DECLARE_PLUGIN(H1_2005_I676166);
}
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