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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
/// @brief CDF Run II underlying event in leading jet events
///
/// @author Hendrik Hoeth
///
/// Rick Field's measurement of the underlying event in "leading jet" events.
/// The leading jet (CDF midpoint \f$ R = 0.7 \f$) must be within \f$|\eta| < 2 \f$
/// and defines the "toward" phi direction. Particles are selected in
/// \f$ |\eta| < 1 \f$. For the \f$ p_\perp \f$-related observables there
/// is a \f$ p_\perp > 0.5 \f$ GeV cut. For \f$ \sum E_\perp \f$ there is no
/// \f$ p_\perp \f$ cut.
///
/// @par Run conditions
/// @arg \f$ \sqrt{s} = \f$ 1960 GeV
/// @arg Run with generic QCD events.
/// @arg Set particles with c*tau > 10 mm stable
/// @arg Several \f$ p_\perp^\text{min} \f$ cutoffs are probably required to fill the profile histograms:
/// @arg \f$ p_\perp^\text{min} = \f$ 0 (min bias), 10, 20, 50, 100, 150 GeV
/// @arg The corresponding merging points are at \f$ p_T = \f$ 0, 30, 50, 80, 130, 180 GeV
class CDF_2010_S8591881_QCD : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(CDF_2010_S8591881_QCD);
/// @name Analysis methods
//@{
void init() {
// Final state for the jet finding
const FinalState fsj(Cuts::abseta < 4.0);
declare(fsj, "FSJ");
declare(FastJets(fsj, FastJets::CDFMIDPOINT, 0.7), "MidpointJets");
// Charged final state for the distributions
const ChargedFinalState cfs(Cuts::abseta < 1.0 && Cuts::pT >= 0.5*GeV);
declare(cfs, "CFS");
// Book histograms
book(_hist_tnchg ,10, 1, 1);
book(_hist_pnchg ,10, 1, 2);
book(_hist_anchg ,10, 1, 3);
book(_hist_pmaxnchg ,11, 1, 1);
book(_hist_pminnchg ,11, 1, 2);
book(_hist_pdifnchg ,11, 1, 3);
book(_hist_tcptsum ,12, 1, 1);
book(_hist_pcptsum ,12, 1, 2);
book(_hist_acptsum ,12, 1, 3);
book(_hist_pmaxcptsum ,13, 1, 1);
book(_hist_pmincptsum ,13, 1, 2);
book(_hist_pdifcptsum ,13, 1, 3);
book(_hist_pcptave ,14, 1, 1);
book(_hist_pcptmax ,15, 1, 1);
}
// Do the analysis
void analyze(const Event& e) {
/// @todo Implement Run II min bias trigger cf. CDF_2009?
const FinalState& fsj = apply<FinalState>(e, "FSJ");
if (fsj.particles().size() < 1) {
MSG_DEBUG("Failed multiplicity cut");
vetoEvent;
}
const Jets& jets = apply<FastJets>(e, "MidpointJets").jetsByPt();
MSG_DEBUG("Jet multiplicity = " << jets.size());
// We require the leading jet to be within |eta|<2
if (jets.size() < 1 || fabs(jets[0].eta()) >= 2) {
MSG_DEBUG("Failed leading jet cut");
vetoEvent;
}
const double jetphi = jets[0].phi();
const double jeteta = jets[0].eta();
const double jetpT = jets[0].pT();
MSG_DEBUG("Leading jet: pT = " << jetpT
<< ", eta = " << jeteta << ", phi = " << jetphi);
// Get the final states to work with for filling the distributions
const FinalState& cfs = apply<ChargedFinalState>(e, "CFS");
size_t numOverall(0), numToward(0), numAway(0) ;
long int numTrans1(0), numTrans2(0);
double ptSumOverall(0.0), ptSumToward(0.0), ptSumTrans1(0.0), ptSumTrans2(0.0), ptSumAway(0.0);
double ptMaxOverall(0.0), ptMaxToward(0.0), ptMaxTrans1(0.0), ptMaxTrans2(0.0), ptMaxAway(0.0);
// Calculate all the charged stuff
for (const Particle& p : cfs.particles()) {
const double dPhi = deltaPhi(p.phi(), jetphi);
const double pT = p.pT();
const double phi = p.phi();
double rotatedphi = phi - jetphi;
while (rotatedphi < 0) rotatedphi += 2*PI;
ptSumOverall += pT;
++numOverall;
if (pT > ptMaxOverall) {
ptMaxOverall = pT;
}
if (dPhi < PI/3.0) {
ptSumToward += pT;
++numToward;
if (pT > ptMaxToward) ptMaxToward = pT;
}
else if (dPhi < 2*PI/3.0) {
if (rotatedphi <= PI) {
ptSumTrans1 += pT;
++numTrans1;
if (pT > ptMaxTrans1) ptMaxTrans1 = pT;
} else {
ptSumTrans2 += pT;
++numTrans2;
if (pT > ptMaxTrans2) ptMaxTrans2 = pT;
}
}
else {
ptSumAway += pT;
++numAway;
if (pT > ptMaxAway) ptMaxAway = pT;
}
} // end charged particle loop
// Fill the histograms
_hist_tnchg->fill(jetpT/GeV, numToward/(4*PI/3));
_hist_pnchg->fill(jetpT/GeV, (numTrans1+numTrans2)/(4*PI/3));
_hist_pmaxnchg->fill(jetpT/GeV, (numTrans1>numTrans2 ? numTrans1 : numTrans2)/(2*PI/3));
_hist_pminnchg->fill(jetpT/GeV, (numTrans1<numTrans2 ? numTrans1 : numTrans2)/(2*PI/3));
_hist_pdifnchg->fill(jetpT/GeV, abs(numTrans1-numTrans2)/(2*PI/3));
_hist_anchg->fill(jetpT/GeV, numAway/(4*PI/3));
_hist_tcptsum->fill(jetpT/GeV, ptSumToward/GeV/(4*PI/3));
_hist_pcptsum->fill(jetpT/GeV, (ptSumTrans1+ptSumTrans2)/GeV/(4*PI/3));
_hist_pmaxcptsum->fill(jetpT/GeV, (ptSumTrans1>ptSumTrans2 ? ptSumTrans1 : ptSumTrans2)/GeV/(2*PI/3));
_hist_pmincptsum->fill(jetpT/GeV, (ptSumTrans1<ptSumTrans2 ? ptSumTrans1 : ptSumTrans2)/GeV/(2*PI/3));
_hist_pdifcptsum->fill(jetpT/GeV, fabs(ptSumTrans1-ptSumTrans2)/GeV/(2*PI/3));
_hist_acptsum->fill(jetpT/GeV, ptSumAway/GeV/(4*PI/3));
if ((numTrans1+numTrans2) > 0) {
_hist_pcptave->fill(jetpT/GeV, (ptSumTrans1+ptSumTrans2)/GeV/(numTrans1+numTrans2));
_hist_pcptmax->fill(jetpT/GeV, (ptMaxTrans1 > ptMaxTrans2 ? ptMaxTrans1 : ptMaxTrans2)/GeV);
}
}
// void finalize() { }
//@}
private:
Profile1DPtr _hist_tnchg;
Profile1DPtr _hist_pnchg;
Profile1DPtr _hist_anchg;
Profile1DPtr _hist_pmaxnchg;
Profile1DPtr _hist_pminnchg;
Profile1DPtr _hist_pdifnchg;
Profile1DPtr _hist_tcptsum;
Profile1DPtr _hist_pcptsum;
Profile1DPtr _hist_acptsum;
Profile1DPtr _hist_pmaxcptsum;
Profile1DPtr _hist_pmincptsum;
Profile1DPtr _hist_pdifcptsum;
Profile1DPtr _hist_pcptave;
Profile1DPtr _hist_pcptmax;
};
RIVET_DECLARE_ALIASED_PLUGIN(CDF_2010_S8591881_QCD, CDF_2010_I849042_QCD);
}
|