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diff --git a/analyses/pluginATLAS/ATLAS_2015_I1404878.cc b/analyses/pluginATLAS/ATLAS_2015_I1404878.cc
--- a/analyses/pluginATLAS/ATLAS_2015_I1404878.cc
+++ b/analyses/pluginATLAS/ATLAS_2015_I1404878.cc
@@ -1,256 +1,261 @@
-// -*- C++ -*-
-#include "Rivet/Analysis.hh"
-#include "Rivet/Projections/FinalState.hh"
-#include "Rivet/Projections/VetoedFinalState.hh"
-#include "Rivet/Projections/IdentifiedFinalState.hh"
-#include "Rivet/Projections/PromptFinalState.hh"
-#include "Rivet/Projections/DressedLeptons.hh"
-#include "Rivet/Projections/FastJets.hh"
-#include "Rivet/Projections/VisibleFinalState.hh"
-
-namespace Rivet {
-
- class ATLAS_2015_I1404878 : public Analysis {
- public:
-
- /// Constructor
- DEFAULT_RIVET_ANALYSIS_CTOR(ATLAS_2015_I1404878);
-
- void init() {
- // Eta ranges
- Cut eta_full = (Cuts::abseta < 4.2) & (Cuts::pT >= 1.0*MeV);
- Cut lep_cuts = (Cuts::abseta < 2.5) && (Cuts::pT > 25*GeV);
-
- // All final state particles
- FinalState fs(eta_full);
-
- // Get photons to dress leptons
- IdentifiedFinalState photons(fs);
- photons.acceptIdPair(PID::PHOTON);
-
- // Projection to find the electrons
- IdentifiedFinalState el_id(fs);
- el_id.acceptIdPair(PID::ELECTRON);
-
- PromptFinalState electrons(el_id);
- electrons.acceptTauDecays(true);
- declare(electrons, "electrons");
-
- DressedLeptons dressedelectrons(photons, electrons, 0.1, lep_cuts, true, true);
- declare(dressedelectrons, "dressedelectrons");
-
- DressedLeptons ewdressedelectrons(photons, electrons, 0.1, eta_full, true, true);
- declare(ewdressedelectrons, "ewdressedelectrons");
-
- // Projection to find the muons
- IdentifiedFinalState mu_id(fs);
- mu_id.acceptIdPair(PID::MUON);
-
- PromptFinalState muons(mu_id);
- muons.acceptTauDecays(true);
- declare(muons, "muons");
-
- DressedLeptons dressedmuons(photons, muons, 0.1, lep_cuts, true, true);
- declare(dressedmuons, "dressedmuons");
-
- DressedLeptons ewdressedmuons(photons, muons, 0.1, eta_full, true, true);
- declare(ewdressedmuons, "ewdressedmuons");
-
- // Projection to find neutrinos
- IdentifiedFinalState nu_id;
- nu_id.acceptNeutrinos();
- PromptFinalState neutrinos(nu_id);
- neutrinos.acceptTauDecays(true);
-
- // get MET from generic invisibles
- VetoedFinalState inv_fs(fs);
- inv_fs.addVetoOnThisFinalState(VisibleFinalState(fs));
- declare(inv_fs, "InvisibleFS");
-
- // Jet clustering.
- VetoedFinalState vfs;
- vfs.addVetoOnThisFinalState(ewdressedelectrons);
- vfs.addVetoOnThisFinalState(ewdressedmuons);
- vfs.addVetoOnThisFinalState(neutrinos);
- FastJets jets(vfs, FastJets::ANTIKT, 0.4);
- jets.useInvisibles(true);
- declare(jets, "jets");
-
- // Histogram booking
- _h["massttbar"] = bookHisto1D( 1, 1, 1);
- _h["massttbar_norm"] = bookHisto1D( 2, 1, 1);
- _h["ptttbar"] = bookHisto1D( 3, 1, 1);
- _h["ptttbar_norm"] = bookHisto1D( 4, 1, 1);
- _h["absrapttbar"] = bookHisto1D( 5, 1, 1);
- _h["absrapttbar_norm"] = bookHisto1D( 6, 1, 1);
- _h["ptpseudotophadron"] = bookHisto1D( 7, 1, 1);
- _h["ptpseudotophadron_norm"] = bookHisto1D( 8, 1, 1);
- _h["absrappseudotophadron"] = bookHisto1D( 9, 1, 1);
- _h["absrappseudotophadron_norm"] = bookHisto1D(10, 1, 1);
- _h["absPout"] = bookHisto1D(11, 1, 1);
- _h["absPout_norm"] = bookHisto1D(12, 1, 1);
- _h["dPhittbar"] = bookHisto1D(13, 1, 1);
- _h["dPhittbar_norm"] = bookHisto1D(14, 1, 1);
- _h["HTttbar"] = bookHisto1D(15, 1, 1);
- _h["HTttbar_norm"] = bookHisto1D(16, 1, 1);
- _h["Yboost"] = bookHisto1D(17, 1, 1);
- _h["Yboost_norm"] = bookHisto1D(18, 1, 1);
- _h["chittbar"] = bookHisto1D(19, 1, 1);
- _h["chittbar_norm"] = bookHisto1D(20, 1, 1);
- _h["RWt"] = bookHisto1D(21, 1, 1);
- _h["RWt_norm"] = bookHisto1D(22, 1, 1);
-
- }
-
- void analyze(const Event& event) {
-
- const double weight = event.weight();
-
- // Get the selected objects, using the projections.
- vector<DressedLepton> electrons = applyProjection<DressedLeptons>(event, "dressedelectrons").dressedLeptons();
- vector<DressedLepton> muons = applyProjection<DressedLeptons>(event, "dressedmuons").dressedLeptons();
- const Jets& jets = applyProjection<FastJets>(event, "jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta < 2.5);
- const FinalState& ifs = applyProjection<FinalState>(event, "InvisibleFS");
-
- // Calculate MET
- FourMomentum met;
- foreach (const Particle& p, ifs.particles()) met += p.momentum();
-
- // Count the number of b-tags
- Jets bjets, lightjets;
- foreach (const Jet& jet, jets){
- bool b_tagged = jet.bTags(Cuts::pT > 5*GeV).size();
- if ( b_tagged && bjets.size() < 2 ) bjets += jet;
- else lightjets += jet;
- }
-
- bool single_electron = (electrons.size() == 1) && (muons.empty());
- bool single_muon = (muons.size() == 1) && (electrons.empty());
-
- DressedLepton *lepton = NULL;
- if (single_electron) lepton = &electrons[0];
- else if (single_muon) lepton = &muons[0];
-
- if(!single_electron && !single_muon) vetoEvent;
- if (jets.size() < 4 || bjets.size() < 2) vetoEvent;
-
- FourMomentum pbjet1; //Momentum of bjet1
- FourMomentum pbjet2; //Momentum of bjet2
- if ( deltaR(bjets[0], *lepton) <= deltaR(bjets[1], *lepton) ) {
- pbjet1 = bjets[0].momentum();
- pbjet2 = bjets[1].momentum();
- } else {
- pbjet1 = bjets[1].momentum();
- pbjet2 = bjets[0].momentum();
- }
-
-
- double bestWmass = 1000.0*TeV;
- double mWPDG = 80.399*GeV;
- int Wj1index = -1, Wj2index = -1;
- for (unsigned int i = 0; i < (lightjets.size() - 1); ++i) {
- for (unsigned int j = i + 1; j < lightjets.size(); ++j) {
- double wmass = (lightjets[i].momentum() + lightjets[j].momentum()).mass();
- if (fabs(wmass - mWPDG) < fabs(bestWmass - mWPDG)) {
- bestWmass = wmass;
- Wj1index = i;
- Wj2index = j;
- }
- }
- }
-
- // compute hadronic W boson
- FourMomentum pWhadron = lightjets[Wj1index].momentum() + lightjets[Wj2index].momentum();
- double pz = computeneutrinoz(lepton->momentum(), met);
- FourMomentum ppseudoneutrino( sqrt(sqr(met.px()) + sqr(met.py()) + sqr(pz)), met.px(), met.py(), pz);
-
-
- //compute leptonic, hadronic, combined pseudo-top
- FourMomentum ppseudotoplepton = lepton->momentum() + ppseudoneutrino + pbjet1;
- FourMomentum ppseudotophadron = pbjet2 + pWhadron;
- FourMomentum pttbar = ppseudotoplepton + ppseudotophadron;
-
- Vector3 z_versor(0,0,1);
- Vector3 vpseudotophadron = ppseudotophadron.vector3();
- Vector3 vpseudotoplepton = ppseudotoplepton.vector3();
- // Observables
- double ystar = 0.5 * deltaRap(ppseudotophadron, ppseudotoplepton);
- double chi_ttbar = exp(2 * fabs(ystar));
- double deltaPhi_ttbar = deltaPhi(ppseudotoplepton,ppseudotophadron);
- double HT_ttbar = ppseudotophadron.pt() + ppseudotoplepton.pt();
- double Yboost = 0.5 * fabs(ppseudotophadron.rapidity() + ppseudotoplepton.rapidity());
- double R_Wt = pWhadron.pt() / ppseudotophadron.pt();
- double absPout = fabs(vpseudotophadron.dot((vpseudotoplepton.cross(z_versor))/(vpseudotoplepton.cross(z_versor).mod())));
-
- // absolute cross sections
- _h["ptpseudotophadron"]->fill( ppseudotophadron.pt(), weight); //pT of pseudo top hadron
- _h["ptttbar"]->fill( pttbar.pt(), weight); //fill pT of ttbar in combined channel
- _h["absrappseudotophadron"]->fill(ppseudotophadron.absrap(), weight);
- _h["absrapttbar"]->fill( pttbar.absrap(), weight);
- _h["massttbar"]->fill( pttbar.mass(), weight);
- _h["absPout"]->fill( absPout, weight);
- _h["chittbar"]->fill( chi_ttbar, weight);
- _h["dPhittbar"]->fill( deltaPhi_ttbar, weight);
- _h["HTttbar"]->fill( HT_ttbar, weight);
- _h["Yboost"]->fill( Yboost, weight);
- _h["RWt"]->fill( R_Wt, weight);
- // normalised cross sections
- _h["ptpseudotophadron_norm"]->fill( ppseudotophadron.pt(), weight); //pT of pseudo top hadron
- _h["ptttbar_norm"]->fill( pttbar.pt(), weight); //fill pT of ttbar in combined channel
- _h["absrappseudotophadron_norm"]->fill(ppseudotophadron.absrap(), weight);
- _h["absrapttbar_norm"]->fill( pttbar.absrap(), weight);
- _h["massttbar_norm"]->fill( pttbar.mass(), weight);
- _h["absPout_norm"]->fill( absPout, weight);
- _h["chittbar_norm"]->fill( chi_ttbar, weight);
- _h["dPhittbar_norm"]->fill( deltaPhi_ttbar, weight);
- _h["HTttbar_norm"]->fill( HT_ttbar, weight);
- _h["Yboost_norm"]->fill( Yboost, weight);
- _h["RWt_norm"]->fill( R_Wt, weight);
-
- }
-
- void finalize() {
- // Normalize to cross-section
- const double sf = (crossSection() / sumOfWeights());
- for (map<string, Histo1DPtr>::iterator hit = _h.begin(); hit != _h.end(); ++hit) {
- scale(hit->second, sf);
- if (hit->first.find("_norm") != string::npos) normalize(hit->second);
- }
- }
-
- private:
-
-
- double computeneutrinoz(const FourMomentum& lepton, FourMomentum& met) const {
- //computing z component of neutrino momentum given lepton and met
- double pzneutrino;
- double m_W = 80.399; // in GeV, given in the paper
- double k = (( sqr( m_W ) - sqr( lepton.mass() ) ) / 2 ) + (lepton.px() * met.px() + lepton.py() * met.py());
- double a = sqr ( lepton.E() )- sqr ( lepton.pz() );
- double b = -2*k*lepton.pz();
- double c = sqr( lepton.E() ) * sqr( met.pT() ) - sqr( k );
- double discriminant = sqr(b) - 4 * a * c;
- double quad[2] = { (- b - sqrt(discriminant)) / (2 * a), (- b + sqrt(discriminant)) / (2 * a) }; //two possible quadratic solns
- if (discriminant < 0) pzneutrino = - b / (2 * a); //if the discriminant is negative
- else { //if the discriminant is greater than or equal to zero, take the soln with smallest absolute value
- double absquad[2];
- for (int n=0; n<2; ++n) absquad[n] = fabs(quad[n]);
- if (absquad[0] < absquad[1]) pzneutrino = quad[0];
- else pzneutrino = quad[1];
- }
-
- return pzneutrino;
- }
-
- double _mT(const FourMomentum &l, FourMomentum &nu) const {
- return sqrt( 2 * l.pT() * nu.pT() * (1 - cos(deltaPhi(l, nu))) );
- }
-
- /// @name Objects that are used by the event selection decisions
- map<string, Histo1DPtr> _h;
- };
-
- // The hook for the plugin system
- DECLARE_RIVET_PLUGIN(ATLAS_2015_I1404878);
-
-}
+// -*- C++ -*-
+#include "Rivet/Analysis.hh"
+#include "Rivet/Projections/FinalState.hh"
+#include "Rivet/Projections/VetoedFinalState.hh"
+#include "Rivet/Projections/IdentifiedFinalState.hh"
+#include "Rivet/Projections/PromptFinalState.hh"
+#include "Rivet/Projections/DressedLeptons.hh"
+#include "Rivet/Projections/FastJets.hh"
+#include "Rivet/Projections/VisibleFinalState.hh"
+
+namespace Rivet {
+
+
+ class ATLAS_2015_I1404878 : public Analysis {
+ public:
+
+ /// Constructor
+ DEFAULT_RIVET_ANALYSIS_CTOR(ATLAS_2015_I1404878);
+
+ void init() {
+ // Eta ranges
+ Cut eta_full = (Cuts::abseta < 4.2) & (Cuts::pT >= 1.0*MeV);
+ Cut lep_cuts = (Cuts::abseta < 2.5) && (Cuts::pT > 25*GeV);
+
+ // All final state particles
+ FinalState fs(eta_full);
+
+ // Get photons to dress leptons
+ IdentifiedFinalState photons(fs);
+ photons.acceptIdPair(PID::PHOTON);
+
+ // Projection to find the electrons
+ IdentifiedFinalState el_id(fs);
+ el_id.acceptIdPair(PID::ELECTRON);
+
+ PromptFinalState electrons(el_id);
+ electrons.acceptTauDecays(true);
+ declare(electrons, "electrons");
+
+ DressedLeptons dressedelectrons(photons, electrons, 0.1, lep_cuts, true, true);
+ declare(dressedelectrons, "dressedelectrons");
+
+ DressedLeptons ewdressedelectrons(photons, electrons, 0.1, eta_full, true, true);
+ declare(ewdressedelectrons, "ewdressedelectrons");
+
+ // Projection to find the muons
+ IdentifiedFinalState mu_id(fs);
+ mu_id.acceptIdPair(PID::MUON);
+
+ PromptFinalState muons(mu_id);
+ muons.acceptTauDecays(true);
+ declare(muons, "muons");
+
+ DressedLeptons dressedmuons(photons, muons, 0.1, lep_cuts, true, true);
+ declare(dressedmuons, "dressedmuons");
+
+ DressedLeptons ewdressedmuons(photons, muons, 0.1, eta_full, true, true);
+ declare(ewdressedmuons, "ewdressedmuons");
+
+ // Projection to find neutrinos
+ IdentifiedFinalState nu_id;
+ nu_id.acceptNeutrinos();
+ PromptFinalState neutrinos(nu_id);
+ neutrinos.acceptTauDecays(true);
+
+ // get MET from generic invisibles
+ VetoedFinalState inv_fs(fs);
+ inv_fs.addVetoOnThisFinalState(VisibleFinalState(fs));
+ declare(inv_fs, "InvisibleFS");
+
+ // Jet clustering.
+ VetoedFinalState vfs;
+ vfs.addVetoOnThisFinalState(ewdressedelectrons);
+ vfs.addVetoOnThisFinalState(ewdressedmuons);
+ vfs.addVetoOnThisFinalState(neutrinos);
+ FastJets jets(vfs, FastJets::ANTIKT, 0.4);
+ jets.useInvisibles(true);
+ declare(jets, "jets");
+
+
+ // Histogram booking
+ _h["massttbar"] = bookHisto1D( 1, 1, 1);
+ _h["massttbar_norm"] = bookHisto1D( 2, 1, 1);
+ _h["ptttbar"] = bookHisto1D( 3, 1, 1);
+ _h["ptttbar_norm"] = bookHisto1D( 4, 1, 1);
+ _h["absrapttbar"] = bookHisto1D( 5, 1, 1);
+ _h["absrapttbar_norm"] = bookHisto1D( 6, 1, 1);
+ _h["ptpseudotophadron"] = bookHisto1D( 7, 1, 1);
+ _h["ptpseudotophadron_norm"] = bookHisto1D( 8, 1, 1);
+ _h["absrappseudotophadron"] = bookHisto1D( 9, 1, 1);
+ _h["absrappseudotophadron_norm"] = bookHisto1D(10, 1, 1);
+ _h["absPout"] = bookHisto1D(11, 1, 1);
+ _h["absPout_norm"] = bookHisto1D(12, 1, 1);
+ _h["dPhittbar"] = bookHisto1D(13, 1, 1);
+ _h["dPhittbar_norm"] = bookHisto1D(14, 1, 1);
+ _h["HTttbar"] = bookHisto1D(15, 1, 1);
+ _h["HTttbar_norm"] = bookHisto1D(16, 1, 1);
+ _h["Yboost"] = bookHisto1D(17, 1, 1);
+ _h["Yboost_norm"] = bookHisto1D(18, 1, 1);
+ _h["chittbar"] = bookHisto1D(19, 1, 1);
+ _h["chittbar_norm"] = bookHisto1D(20, 1, 1);
+ _h["RWt"] = bookHisto1D(21, 1, 1);
+ _h["RWt_norm"] = bookHisto1D(22, 1, 1);
+
+ }
+
+ void analyze(const Event& event) {
+
+ const double weight = event.weight();
+
+ // Get the selected objects, using the projections.
+ vector<DressedLepton> electrons = applyProjection<DressedLeptons>(event, "dressedelectrons").dressedLeptons();
+ vector<DressedLepton> muons = applyProjection<DressedLeptons>(event, "dressedmuons").dressedLeptons();
+ const Jets& jets = applyProjection<FastJets>(event, "jets").jetsByPt(Cuts::pT > 25*GeV && Cuts::abseta < 2.5);
+ const FinalState& ifs = applyProjection<FinalState>(event, "InvisibleFS");
+
+ // Calculate MET
+ FourMomentum met;
+ for (const Particle& p : ifs.particles()) met += p.momentum();
+
+ // Count the number of b-tags
+ Jets bjets, lightjets;
+ for (const Jet& jet : jets){
+ bool b_tagged = jet.bTags(Cuts::pT > 5*GeV).size();
+ if ( b_tagged && bjets.size() < 2 ) bjets += jet;
+ else lightjets += jet;
+ }
+
+ bool single_electron = (electrons.size() == 1) && (muons.empty());
+ bool single_muon = (muons.size() == 1) && (electrons.empty());
+
+ DressedLepton* lepton = nullptr;
+ if (single_electron) lepton = &electrons[0];
+ else if (single_muon) lepton = &muons[0];
+
+ if(!single_electron && !single_muon) vetoEvent;
+ if (jets.size() < 4 || bjets.size() < 2) vetoEvent;
+
+ FourMomentum pbjet1; // Momentum of bjet1
+ FourMomentum pbjet2; // Momentum of bjet2
+ if ( deltaR(bjets[0], *lepton) <= deltaR(bjets[1], *lepton) ) {
+ pbjet1 = bjets[0].momentum();
+ pbjet2 = bjets[1].momentum();
+ } else {
+ pbjet1 = bjets[1].momentum();
+ pbjet2 = bjets[0].momentum();
+ }
+
+
+ double bestWmass = 1000.0*TeV;
+ double mWPDG = 80.399*GeV;
+ int Wj1index = -1, Wj2index = -1;
+ for (unsigned int i = 0; i < (lightjets.size() - 1); ++i) {
+ for (unsigned int j = i + 1; j < lightjets.size(); ++j) {
+ double wmass = (lightjets[i].momentum() + lightjets[j].momentum()).mass();
+ if (fabs(wmass - mWPDG) < fabs(bestWmass - mWPDG)) {
+ bestWmass = wmass;
+ Wj1index = i;
+ Wj2index = j;
+ }
+ }
+ }
+
+ // Compute hadronic W boson
+ FourMomentum pWhadron = lightjets[Wj1index].momentum() + lightjets[Wj2index].momentum();
+ double pz = _computeneutrinoz(lepton->momentum(), met);
+ FourMomentum ppseudoneutrino( sqrt(sqr(met.px()) + sqr(met.py()) + sqr(pz)), met.px(), met.py(), pz);
+
+
+ // Compute leptonic, hadronic, combined pseudo-top
+ FourMomentum ppseudotoplepton = lepton->momentum() + ppseudoneutrino + pbjet1;
+ FourMomentum ppseudotophadron = pbjet2 + pWhadron;
+ FourMomentum pttbar = ppseudotoplepton + ppseudotophadron;
+
+ Vector3 z_versor(0,0,1);
+ Vector3 vpseudotophadron = ppseudotophadron.vector3();
+ Vector3 vpseudotoplepton = ppseudotoplepton.vector3();
+ // Observables
+ double ystar = 0.5 * deltaRap(ppseudotophadron, ppseudotoplepton);
+ double chi_ttbar = exp(2 * fabs(ystar));
+ double deltaPhi_ttbar = deltaPhi(ppseudotoplepton,ppseudotophadron);
+ double HT_ttbar = ppseudotophadron.pt() + ppseudotoplepton.pt();
+ double Yboost = 0.5 * fabs(ppseudotophadron.rapidity() + ppseudotoplepton.rapidity());
+ double R_Wt = pWhadron.pt() / ppseudotophadron.pt();
+ double absPout = fabs(vpseudotophadron.dot((vpseudotoplepton.cross(z_versor))/(vpseudotoplepton.cross(z_versor).mod())));
+
+ // absolute cross sections
+ _h["ptpseudotophadron"]->fill( ppseudotophadron.pt(), weight); //pT of pseudo top hadron
+ _h["ptttbar"]->fill( pttbar.pt(), weight); //fill pT of ttbar in combined channel
+ _h["absrappseudotophadron"]->fill(ppseudotophadron.absrap(), weight);
+ _h["absrapttbar"]->fill( pttbar.absrap(), weight);
+ _h["massttbar"]->fill( pttbar.mass(), weight);
+ _h["absPout"]->fill( absPout, weight);
+ _h["chittbar"]->fill( chi_ttbar, weight);
+ _h["dPhittbar"]->fill( deltaPhi_ttbar, weight);
+ _h["HTttbar"]->fill( HT_ttbar, weight);
+ _h["Yboost"]->fill( Yboost, weight);
+ _h["RWt"]->fill( R_Wt, weight);
+ // normalised cross sections
+ _h["ptpseudotophadron_norm"]->fill( ppseudotophadron.pt(), weight); //pT of pseudo top hadron
+ _h["ptttbar_norm"]->fill( pttbar.pt(), weight); //fill pT of ttbar in combined channel
+ _h["absrappseudotophadron_norm"]->fill(ppseudotophadron.absrap(), weight);
+ _h["absrapttbar_norm"]->fill( pttbar.absrap(), weight);
+ _h["massttbar_norm"]->fill( pttbar.mass(), weight);
+ _h["absPout_norm"]->fill( absPout, weight);
+ _h["chittbar_norm"]->fill( chi_ttbar, weight);
+ _h["dPhittbar_norm"]->fill( deltaPhi_ttbar, weight);
+ _h["HTttbar_norm"]->fill( HT_ttbar, weight);
+ _h["Yboost_norm"]->fill( Yboost, weight);
+ _h["RWt_norm"]->fill( R_Wt, weight);
+
+ }
+
+ void finalize() {
+ // Normalize to cross-section
+ const double sf = crossSection() / sumOfWeights();
+ for (auto& k_h : _h) {
+ scale(k_h.second, sf);
+ if (k_h.first.find("_norm") != string::npos) normalize(k_h.second);
+ }
+ }
+
+
+ private:
+
+ // Compute z component of neutrino momentum given lepton and met
+ double _computeneutrinoz(const FourMomentum& lepton, FourMomentum& met) const {
+ double m_W = 80.399; // in GeV, given in the paper
+ double k = (( sqr( m_W ) - sqr( lepton.mass() ) ) / 2 ) + (lepton.px() * met.px() + lepton.py() * met.py());
+ double a = sqr ( lepton.E() )- sqr ( lepton.pz() );
+ double b = -2*k*lepton.pz();
+ double c = sqr( lepton.E() ) * sqr( met.pT() ) - sqr( k );
+ double discriminant = sqr(b) - 4 * a * c;
+ double quad[2] = { (- b - sqrt(discriminant)) / (2 * a), (- b + sqrt(discriminant)) / (2 * a) }; //two possible quadratic solns
+
+ double pzneutrino;
+ if (discriminant < 0) { // if the discriminant is negative:
+ pzneutrino = - b / (2 * a);
+ } else { // if the discriminant is positive, take the soln with smallest absolute value
+ pzneutrino = (fabs(quad[0]) < fabs(quad[1])) ? quad[0] : quad[1];
+ }
+ return pzneutrino;
+ }
+
+ /// @todo Replace with central version
+ double _mT(const FourMomentum &l, FourMomentum &nu) const {
+ return sqrt( 2 * l.pT() * nu.pT() * (1 - cos(deltaPhi(l, nu))) );
+ }
+
+
+ /// @name Objects that are used by the event selection decisions
+ map<string, Histo1DPtr> _h;
+
+ };
+
+
+ // The hook for the plugin system
+ DECLARE_RIVET_PLUGIN(ATLAS_2015_I1404878);
+
+
+}

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