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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ZFinder.hh"
namespace Rivet {
class D0_2010_S8821313 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(D0_2010_S8821313);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
/// Initialise and register projections
FinalState fs;
Cut cuts = (Cuts::abseta < 1.1 || Cuts::absetaIn( 1.5, 3.0)) && Cuts::pT > 20*GeV;
ZFinder zfinder_ee(fs, cuts, PID::ELECTRON, 70*GeV, 110*GeV, 0.2, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES);
declare(zfinder_ee, "zfinder_ee");
ZFinder zfinder_mm(fs, Cuts::abseta < 2 && Cuts::pT > 15*GeV, PID::MUON, 70*GeV, 110*GeV, 0.0, ZFinder::ClusterPhotons::NONE, ZFinder::AddPhotons::NO);
declare(zfinder_mm, "zfinder_mm");
/// Book histograms here
{Histo1DPtr tmp; _h_phistar_ee.add(0.0, 1.0, book(tmp, 1, 1, 1));}
{Histo1DPtr tmp; _h_phistar_ee.add(1.0, 2.0, book(tmp, 1, 1, 2));}
{Histo1DPtr tmp; _h_phistar_ee.add(2.0, 10.0,book(tmp, 1, 1, 3));}
{Histo1DPtr tmp; _h_phistar_mm.add(0.0, 1.0, book(tmp, 2, 1, 1));}
{Histo1DPtr tmp; _h_phistar_mm.add(1.0, 2.0, book(tmp, 2, 1, 2));}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const double weight = 1.0;
const ZFinder& zfinder_ee = apply<ZFinder>(event, "zfinder_ee");
if (zfinder_ee.bosons().size() == 1) {
Particles ee = zfinder_ee.constituents();
std::sort(ee.begin(), ee.end(), cmpMomByPt);
const FourMomentum& eminus = PID::charge3(ee[0].pid()) < 0 ? ee[0].momentum() : ee[1].momentum();
const FourMomentum& eplus = PID::charge3(ee[0].pid()) < 0 ? ee[1].momentum() : ee[0].momentum();
double phi_acop = M_PI - mapAngle0ToPi(eminus.phi() - eplus.phi());
double costhetastar = tanh((eminus.eta() - eplus.eta())/2);
double sin2thetastar = 1 - sqr(costhetastar);
if (sin2thetastar < 0) sin2thetastar = 0;
const double phistar = tan(phi_acop/2) * sqrt(sin2thetastar);
const FourMomentum& zmom = zfinder_ee.bosons()[0].momentum();
_h_phistar_ee.fill(zmom.rapidity(), phistar, weight);
}
const ZFinder& zfinder_mm = apply<ZFinder>(event, "zfinder_mm");
if (zfinder_mm.bosons().size() == 1) {
Particles mm = zfinder_mm.constituents();
std::sort(mm.begin(), mm.end(), cmpMomByPt);
const FourMomentum& mminus = PID::charge3(mm[0].pid()) < 0 ? mm[0].momentum() : mm[1].momentum();
const FourMomentum& mplus = PID::charge3(mm[0].pid()) < 0 ? mm[1].momentum() : mm[0].momentum();
double phi_acop = M_PI - mapAngle0ToPi(mminus.phi() - mplus.phi());
double costhetastar = tanh((mminus.eta() - mplus.eta())/2);
double sin2thetastar = 1 - sqr(costhetastar);
if (sin2thetastar < 0) sin2thetastar = 0;
const double phistar = tan(phi_acop/2) * sqrt(sin2thetastar);
const FourMomentum& zmom = zfinder_mm.bosons()[0].momentum();
_h_phistar_mm.fill(zmom.rapidity(), phistar, weight);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for (Histo1DPtr hist : _h_phistar_ee.histos()) normalize(hist);
for (Histo1DPtr hist : _h_phistar_mm.histos()) normalize(hist);
}
//@}
private:
/// @name Histograms
//@{
BinnedHistogram _h_phistar_ee;
BinnedHistogram _h_phistar_mm;
//@}
};
RIVET_DECLARE_ALIASED_PLUGIN(D0_2010_S8821313, D0_2010_I871787);
}
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