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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/WFinder.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
/// @brief MC validation analysis for Wjj events
class MC_WVBF : public Analysis {
public:
/// Default constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MC_WVBF);
/// @name Analysis methods
//@{
/// Initialize
void init() {
_dR=0.1;
if (getOption("SCHEME") == "BARE") _dR = 0.0;
_lepton=PID::ELECTRON;
if (getOption("LMODE") == "MU") _lepton = PID::MUON;
FinalState fs;
WFinder wfinder(fs, Cuts::abseta < 3.5 && Cuts::pT > 25*GeV, _lepton, 60.0*GeV, 100.0*GeV, 25.0*GeV, _dR);
declare(wfinder, "WFinder");
FastJets jetpro(wfinder.remainingFinalState(), FastJets::ANTIKT, 0.4);
declare(jetpro, "Jets");
const double sqrts = sqrtS() ? sqrtS() : 14*TeV;
book(_h["gap_inc"], "N_gapjets_inclusive", 8, -0.5, 7.5);
book(_h["gap_exc"], "N_gapjets_exclusive", 8, -0.5, 7.5);
book(_h["W_jet1_deta"], "W_jet1_deta", 50, -5, 5);
book(_h["W_jet1_dR"], "W_jet1_dR", 25, 0.5, 7.0);
book(_h["HT"], "jets_HT", logspace(40, 50, sqrts/GeV/2.0));
book(_h["mjj"], "m_jj", 40, 200.0, sqrts/GeV/2.0);
book(_h["jve_mjj"], "_jve_mjj", 40, 200.0, sqrts/GeV/2.0);
book(_h["pTV"] ,"W_pT", logspace(100, 1.0, 0.5*sqrts/GeV));
book(_h["dphi"], "dphi_jj", 20., -1., 1.);
book(_h["drap"], "drap_jj", 20., -10., 10.);
book(_h["3JC"], "jet_3_centrality", 25., -2.5, 2.5);
book(_s["jve_mjj"], "jet_veto_efficiency_mjj");
for (size_t i = 0; i < 4; ++i) {
const string pTname = "jet_pT_" + to_str(i+1);
const double pTmax = 1.0/(double(i)+2.0) * sqrts/GeV/2.0;
const int nbins_pT = 100/(i+1);
if (pTmax > 10) { // Protection aginst logspace exception, needed for LEP
book(_h[pTname], pTname, logspace(nbins_pT, 10.0, pTmax));
}
const string etaname = "jet_eta_" + to_str(i+1);
book(_h[etaname], etaname, (i > 1 ? 25 : 50), -5.0, 5.0);
const string rapname = "jet_y_" + to_str(i+1);
book(_h[rapname], rapname, (i > 1 ? 25 : 50), -5.0, 5.0);
const string phiname = "jet_phi_" + to_str(i+1);
book(_h[phiname], phiname, (i > 1 ? 25 : 50), -1.0, 1.0);
}
}
/// Do the analysis
void analyze(const Event & e) {
MSG_TRACE("MC_WVBF: running WFinder");
const WFinder& wfinder = apply<WFinder>(e, "WFinder");
if (wfinder.bosons().size() != 1) vetoEvent;
const FourMomentum& wmom = wfinder.bosons()[0].momentum();
MSG_TRACE("MC_WVBF: have exactly one Z boson candidate");
const Jets& jets = apply<FastJets>(e, "Jets").jetsByPt(Cuts::absrap < 5 && Cuts::pT > 30*GeV);
if (jets.size() < 2) {
MSG_TRACE("MC_WVBF: does not have at least two valid jets");
vetoEvent;
}
Jet tag1 = jets.at(0);
Jet tag2 = jets.at(1);
const double mjj = (tag1.mom() + tag2.mom()).mass()/GeV;
if (mjj < 200.) {
MSG_TRACE("MC_WVBF: should have at least 200 GeV in Mjj");
vetoEvent;
}
// jet kinematics
for (size_t i = 0; i < min(4u, jets.size()); ++i) {
const string pTname = "jet_pT_" + to_str(i+1);
const string etaname = "jet_eta_" + to_str(i+1);
const string rapname = "jet_y_" + to_str(i+1);
const string phiname = "jet_phi_" + to_str(i+1);
_h[pTname]->fill(jets[i].pT()/GeV);
_h[etaname]->fill(jets[i].eta());
_h[rapname]->fill(jets[i].rap());
_h[phiname]->fill(mapAngleMPiToPi(jets[i].phi())/M_PI);
}
size_t n_gap = 0;
// start loop at the 3rd hardest pT jet
for (size_t i = 2; i < jets.size(); ++i) {
const Jet j = jets.at(i);
if (isBetween(j, tag1, tag2)) ++n_gap;
}
// gap-jet multiplicities
_h["gap_exc"]->fill(n_gap);
for (size_t i = 0; i <= 7; ++i) {
if (n_gap >= i) {
_h["gap_inc"]->fill(i);
}
}
_h["jve_mjj"]->fill(mjj);
if (n_gap) {
// third-jet centrality
const double rap1 = jets[0].rap();
const double rap2 = jets[1].rap();
const double rap3 = jets[2].rap();
const double JC = (rap3 - 0.5*(rap1 + rap2))/(rap1 - rap2);
_h["3JC"]->fill(JC);
}
else {
MSG_TRACE("MC_WVBF: should satisfy a CJV");
const double HT = sum(jets, Kin::pT, 0.0)/GeV;
_h["HT"]->fill(HT);
_h["mjj"]->fill(mjj);
_h["pTV"]->fill(wmom.pT()/GeV);
_h["dphi"]->fill(signedDeltaPhi(tag1, tag2));
_h["drap"]->fill(tag1.rap() - tag2.rap());
// Z tagging jet correlations
_h["W_jet1_deta"]->fill(wmom.eta()-jets[0].eta());
_h["W_jet1_dR"]->fill(deltaR(wmom, jets[0].momentum()));
}
}
/// Finalize
void finalize() {
scale(_h, crossSection()/femtobarn/sumOfWeights());
efficiency(_h["mjj"], _h["jve_mjj"], _s["jve_mjj"]);
}
//@}
// check if jet is between tagging jets
bool isBetween(const Jet &probe, const Jet &boundary1, const Jet &boundary2) {
double y_p = probe.rapidity();
double y_b1 = boundary1.rapidity();
double y_b2 = boundary2.rapidity();
double y_min = std::min(y_b1, y_b2);
double y_max = std::max(y_b1, y_b2);
return (y_p > y_min && y_p < y_max);
}
double signedDeltaPhi(Jet &j1, Jet &j2) {
double dphijj = 0.;
if (j1.rap() > j2.rap()) dphijj = j1.phi() - j2.phi();
else dphijj = j2.phi() - j1.phi();
return mapAngleMPiToPi(dphijj)/M_PI;
}
private:
/// @name Parameters for specialised e/mu and dressed/bare subclassing
//@{
double _dR;
PdgId _lepton;
//@}
/// @name Histograms
//@{
map<string,Histo1DPtr> _h;
map<string,Scatter2DPtr> _s;
//@}
};
RIVET_DECLARE_PLUGIN(MC_WVBF);
}
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