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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/PromptFinalState.hh"
namespace Rivet {
/// Z + jets in pp at 7 TeV (combined channel / base class)
/// @note This base class contains a "mode" variable for combined, e, and mu channel derived classes
class ATLAS_2013_I1230812 : public Analysis {
public:
/// @name Constructors etc.
//@{
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2013_I1230812);
//@}
/// Book histograms and initialise projections before the run
void init() {
// Get options from the new option system
_mode = 0;
if ( getOption("LMODE") == "EL" ) _mode = 1;
if ( getOption("LMODE") == "MU" ) _mode = 2;
// Determine the e/mu decay channels used (NB Prompt leptons only).
/// @todo Note that Zs are accepted with any rapidity: the cuts are on the e/mu: is this correct?
Cut pt20 = Cuts::pT >= 20*GeV;
Cut eta_e = _mode? Cuts::abseta < 1.37 || Cuts::absetaIn(1.52, 2.47) : Cuts::abseta < 2.5;
Cut eta_m = _mode? Cuts::abseta < 2.4 : Cuts::abseta < 2.5;
ZFinder zfinder_el(FinalState(eta_e), pt20, PID::ELECTRON, 66*GeV, 116*GeV);
ZFinder zfinder_mu(FinalState(eta_m), pt20, PID::MUON, 66*GeV, 116*GeV);
declare(zfinder_el, "zfinder_el");
declare(zfinder_mu, "zfinder_mu");
// Define veto FS in order to prevent Z-decay products entering the jet algorithm
VetoedFinalState had_fs;
had_fs.addVetoOnThisFinalState(getProjection<ZFinder>("zfinder_el"));
had_fs.addVetoOnThisFinalState(getProjection<ZFinder>("zfinder_mu"));
FastJets jets(had_fs, FastJets::ANTIKT, 0.4, JetAlg::Muons::ALL, JetAlg::Invisibles::ALL);
declare(jets, "jets");
book(_h_njet_incl , 1, 1, _mode+1);
book(_h_njet_incl_ratio , 2, 1, _mode+1, true);
book(_h_njet_excl , 3, 1, _mode+1);
book(_h_njet_excl_ratio , 4, 1, _mode+1, true);
book(_h_njet_excl_pt150 , 5, 1, _mode+1);
book(_h_njet_excl_pt150_ratio , 6, 1, _mode+1, true);
book(_h_njet_excl_vbf , 7, 1, _mode+1);
book(_h_njet_excl_vbf_ratio , 8, 1, _mode+1, true);
book(_h_ptlead , 9, 1, _mode+1);
book(_h_ptseclead , 10, 1, _mode+1);
book(_h_ptthirdlead , 11, 1, _mode+1);
book(_h_ptfourthlead , 12, 1, _mode+1);
book(_h_ptlead_excl , 13, 1, _mode+1);
book(_h_pt_ratio , 14, 1, _mode+1);
book(_h_pt_z , 15, 1, _mode+1);
book(_h_pt_z_excl , 16, 1, _mode+1);
book(_h_ylead , 17, 1, _mode+1);
book(_h_yseclead , 18, 1, _mode+1);
book(_h_ythirdlead , 19, 1, _mode+1);
book(_h_yfourthlead , 20, 1, _mode+1);
book(_h_deltay , 21, 1, _mode+1);
book(_h_mass , 22, 1, _mode+1);
book(_h_deltaphi , 23, 1, _mode+1);
book(_h_deltaR , 24, 1, _mode+1);
book(_h_ptthirdlead_vbf , 25, 1, _mode+1);
book(_h_ythirdlead_vbf , 26, 1, _mode+1);
book(_h_ht , 27, 1, _mode+1);
book(_h_st , 28, 1, _mode+1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
FourMomentum z, lp, lm;
const ZFinder& zfinder_el = apply<ZFinder>(event, "zfinder_el");
const ZFinder& zfinder_mu = apply<ZFinder>(event, "zfinder_mu");
bool e_ok = zfinder_el.constituents().size() == 2 && zfinder_mu.constituents().size() ==0;
bool m_ok = zfinder_el.constituents().size() == 0 && zfinder_mu.constituents().size() ==2;
if (_mode == 0 && !e_ok && !m_ok ) vetoEvent;
if (_mode == 1 && !e_ok) vetoEvent;
if (_mode == 2 && !m_ok) vetoEvent;
if (zfinder_el.constituents().size() == 2) {
z = zfinder_el.boson().momentum();
lp = zfinder_el.constituents()[0].momentum();
lm = zfinder_el.constituents()[1].momentum();
}
else if (zfinder_mu.constituents().size() == 2) {
z = zfinder_mu.boson().momentum();
lp = zfinder_mu.constituents()[0].momentum();
lm = zfinder_mu.constituents()[1].momentum();
}
else vetoEvent;
if (deltaR(lp, lm) < 0.2) vetoEvent;
Jets jets = apply<FastJets>(event, "jets").jetsByPt(Cuts::pT > 30*GeV && Cuts::absrap < 4.4);
ifilter_discard(jets, deltaRLess(lp, 0.5));
ifilter_discard(jets, deltaRLess(lm, 0.5));
// Fill jet multiplicities
for (size_t ijet = 0; ijet <= jets.size(); ++ijet) {
_h_njet_incl->fill(ijet);
}
_h_njet_excl->fill(jets.size());
// Require at least one jet
if (jets.size() >= 1) {
// Leading jet histos
const double ptlead = jets[0].pT()/GeV;
const double yabslead = fabs(jets[0].rapidity());
const double ptz = z.pT()/GeV;
_h_ptlead->fill(ptlead);
_h_ylead ->fill(yabslead);
_h_pt_z ->fill(ptz);
// Fill jet multiplicities
if (ptlead > 150) _h_njet_excl_pt150->fill(jets.size());
// Loop over selected jets, fill inclusive distributions
double st = 0;
double ht = lp.pT()/GeV + lm.pT()/GeV;
for (size_t ijet = 0; ijet < jets.size(); ++ijet) {
ht += jets[ijet].pT()/GeV;
st += jets[ijet].pT()/GeV;
}
_h_ht->fill(ht);
_h_st->fill(st);
// Require exactly one jet
if (jets.size() == 1) {
_h_ptlead_excl->fill(ptlead);
_h_pt_z_excl ->fill(ptz);
}
}
// Require at least two jets
if (jets.size() >= 2) {
// Second jet histos
const double ptlead = jets[0].pT()/GeV;
const double pt2ndlead = jets[1].pT()/GeV;
const double ptratio = pt2ndlead/ptlead;
const double yabs2ndlead = fabs(jets[1].rapidity());
_h_ptseclead->fill(pt2ndlead);
_h_yseclead->fill( yabs2ndlead);
_h_pt_ratio->fill( ptratio);
// Dijet histos
const double deltaphi = fabs(deltaPhi(jets[1], jets[0]));
const double deltarap = fabs(jets[0].rapidity() - jets[1].rapidity()) ;
const double deltar = fabs(deltaR(jets[0], jets[1], RAPIDITY));
const double mass = (jets[0].momentum() + jets[1].momentum()).mass()/GeV;
_h_mass->fill( mass);
_h_deltay->fill( deltarap);
_h_deltaphi->fill(deltaphi);
_h_deltaR->fill( deltar);
if (mass > 350 && deltarap > 3) _h_njet_excl_vbf->fill(jets.size());
}
// Require at least three jets
if (jets.size() >= 3) {
// Third jet histos
const double pt3rdlead = jets[2].pT()/GeV;
const double yabs3rdlead = fabs(jets[2].rapidity());
_h_ptthirdlead->fill(pt3rdlead);
_h_ythirdlead->fill( yabs3rdlead);
//Histos after VBF preselection
const double deltarap = fabs(jets[0].rapidity() - jets[1].rapidity()) ;
const double mass = (jets[0].momentum() + jets[1].momentum()).mass();
if (mass > 350 && deltarap > 3) {
_h_ptthirdlead_vbf->fill(pt3rdlead);
_h_ythirdlead_vbf->fill( yabs3rdlead);
}
}
// Require at least four jets
if (jets.size() >= 4) {
// Fourth jet histos
const double pt4thlead = jets[3].pT()/GeV;
const double yabs4thlead = fabs(jets[3].rapidity());
_h_ptfourthlead->fill(pt4thlead);
_h_yfourthlead->fill( yabs4thlead);
}
}
/// @name Ratio calculator util functions
//@{
/// Calculate the efficiency error, being careful about div-by-zero
double err_incl(const HistoBin1D &M, const HistoBin1D &N, bool hasWeights) {
double r = safediv(M.sumW(), N.sumW());
if (hasWeights) { // use F. James's approximation for weighted events
return sqrt( safediv((1 - 2 * r) * M.sumW2() + r * r * N.sumW2(), N.sumW() * N.sumW()) );
}
return sqrt( safediv(r * (1 - r), N.sumW()) );
}
/// Calculate the ratio error, being careful about div-by-zero
double err_excl(const HistoBin1D &A, const HistoBin1D &B) {
double r = safediv(A.sumW(), B.sumW());
double dAsquared = safediv(A.sumW2(), A.sumW() * A.sumW()); // squared relative error of A
double dBsquared = safediv(B.sumW2(), B.sumW() * B.sumW()); // squared relative error of B
return r * sqrt(dAsquared + dBsquared);
}
//@}
void finalize() {
bool hasWeights = _h_njet_incl->effNumEntries() != _h_njet_incl->numEntries();
for (size_t i = 0; i < 6; ++i) {
_h_njet_incl_ratio->point(i).setY(safediv(_h_njet_incl->bin(i + 1).sumW(), _h_njet_incl->bin(i).sumW()),
err_incl(_h_njet_incl->bin(i + 1), _h_njet_incl->bin(i), hasWeights));
_h_njet_excl_ratio->point(i).setY(safediv(_h_njet_excl->bin(i + 1).sumW(), _h_njet_excl->bin(i).sumW()),
err_excl(_h_njet_excl->bin(i + 1), _h_njet_excl->bin(i)));
if (i >= 1) {
_h_njet_excl_pt150_ratio->point(i - 1).setY(safediv(_h_njet_excl_pt150->bin(i).sumW(), _h_njet_excl_pt150->bin(i - 1).sumW()),
err_excl(_h_njet_excl_pt150->bin(i), _h_njet_excl_pt150->bin(i - 1)));
if (i >= 2) {
_h_njet_excl_vbf_ratio->point(i - 2).setY(safediv(_h_njet_excl_vbf->bin(i).sumW(), _h_njet_excl_vbf->bin(i - 1).sumW()),
err_excl(_h_njet_excl_vbf->bin(i), _h_njet_excl_vbf->bin(i - 1)));
}
}
}
double sf = _mode? 1.0 : 0.5;
const double xs = sf * crossSectionPerEvent()/picobarn;
scale(_h_njet_incl, xs); scale(_h_njet_excl, xs); scale(_h_njet_excl_pt150, xs);
scale(_h_njet_excl_vbf, xs); scale(_h_ptlead, xs); scale(_h_ptseclead, xs);
scale(_h_ptthirdlead, xs); scale(_h_ptfourthlead, xs); scale(_h_ptlead_excl, xs);
scale(_h_pt_ratio, xs); scale(_h_pt_z, xs); scale(_h_pt_z_excl, xs);
scale(_h_ylead, xs); scale(_h_yseclead, xs); scale(_h_ythirdlead, xs);
scale(_h_yfourthlead, xs); scale(_h_deltay, xs); scale(_h_mass, xs);
scale(_h_deltaphi, xs); scale(_h_deltaR, xs); scale(_h_ptthirdlead_vbf, xs);
scale(_h_ythirdlead_vbf, xs); scale(_h_ht, xs); scale(_h_st, xs);
}
//@}
protected:
size_t _mode;
private:
Scatter2DPtr _h_njet_incl_ratio;
Scatter2DPtr _h_njet_excl_ratio;
Scatter2DPtr _h_njet_excl_pt150_ratio;
Scatter2DPtr _h_njet_excl_vbf_ratio;
Histo1DPtr _h_njet_incl;
Histo1DPtr _h_njet_excl;
Histo1DPtr _h_njet_excl_pt150;
Histo1DPtr _h_njet_excl_vbf;
Histo1DPtr _h_ptlead;
Histo1DPtr _h_ptseclead;
Histo1DPtr _h_ptthirdlead;
Histo1DPtr _h_ptfourthlead;
Histo1DPtr _h_ptlead_excl;
Histo1DPtr _h_pt_ratio;
Histo1DPtr _h_pt_z;
Histo1DPtr _h_pt_z_excl;
Histo1DPtr _h_ylead;
Histo1DPtr _h_yseclead;
Histo1DPtr _h_ythirdlead;
Histo1DPtr _h_yfourthlead;
Histo1DPtr _h_deltay;
Histo1DPtr _h_mass;
Histo1DPtr _h_deltaphi;
Histo1DPtr _h_deltaR;
Histo1DPtr _h_ptthirdlead_vbf;
Histo1DPtr _h_ythirdlead_vbf;
Histo1DPtr _h_ht;
Histo1DPtr _h_st;
};
RIVET_DECLARE_PLUGIN(ATLAS_2013_I1230812);
}
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