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TTbarAnalysis.cc
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// -*- C++ -*-
//
// TTbarAnalysis.cc is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2011 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
//
// This is the implementation of the non-inlined, non-templated member
// functions of the TTbarAnalysis class.
//
#include "TTbarAnalysis.h"
#include "ThePEG/Repository/EventGenerator.h"
#include "ThePEG/EventRecord/Particle.h"
#include "ThePEG/EventRecord/Event.h"
#include "ThePEG/PDT/EnumParticles.h"
#include "ThePEG/Interface/ClassDocumentation.h"
#include "ThePEG/Persistency/PersistentOStream.h"
#include "ThePEG/Persistency/PersistentIStream.h"
using namespace Herwig;
namespace {
bool isLastInShower(const Particle & p) {
return p.children().size() > 1
&& p.children()[0]->id() != p.id()
&& p.children()[1]->id() != p.id();
}
struct TTBar {
static bool AllCollisions() { return false; }
static bool AllSteps() { return true; }
// ===
// pick the last instance from the shower
static bool FinalState() { return false; }
static bool Intermediate() { return true; }
// ===
static bool Check(const Particle & p) {
return abs(p.id()) == ParticleID::t && isLastInShower(p);
}
};
}
TTbarAnalysis::TTbarAnalysis() :
_pttop(0.,350.,100), _pttbar(0.,350.,100), _ptpair(0.,350.,100),
_ettop(0.,350.,100), _ettbar(0.,350.,100), _etpair(0.,350.,100),
_etop(0.,3000.,100), _etbar(0.,3000.,100), _epair(0.,6000.,100),
_raptop(-5.,5.,100), _raptbar(-5.,5.,100), _rappair(-5.,5.,100),
_phitop (-Constants::pi,Constants::pi,50),
_phitbar (-Constants::pi,Constants::pi,50),
_deltaphi(-Constants::pi,Constants::pi,100), _mpair(300,1500,100),
_etsum(0.,700.,100), _ptsum(0.,700.,100) {}
void TTbarAnalysis::dofinish() {
AnalysisHandler::dofinish();
string fname = generator()->filename() + string("-") + name() + string(".top");
ofstream outfile(fname.c_str());
using namespace HistogramOptions;
_pttop.topdrawOutput(outfile,Frame|Ylog,"RED","pt t, tbar");
_pttbar.topdrawOutput(outfile,Ylog,"BLUE","pt tbar");
_ptpair.topdrawOutput(outfile,Frame|Ylog,"BLACK","pt pair");
_ettop.topdrawOutput(outfile,Frame|Ylog,"RED","Et t, tbar");
_ettbar.topdrawOutput(outfile,Ylog,"BLUE","Et tbar");
_etpair.topdrawOutput(outfile,Frame|Ylog,"BLACK","Et pair");
_etop.topdrawOutput(outfile,Frame|Ylog,"RED","E t, tbar");
_etbar.topdrawOutput(outfile,Ylog,"BLUE","E tbar");
_epair.topdrawOutput(outfile,Frame|Ylog,"BLACK","E pair");
_raptop.topdrawOutput(outfile,Frame,"RED","y t, tbar");
_raptbar.topdrawOutput(outfile,None,"BLUE","y tbar");
_rappair.topdrawOutput(outfile,Frame,"BLACK","y pair");
_phitop.topdrawOutput(outfile,Frame,"RED","phi t, tbar");
_phitbar.topdrawOutput(outfile,None,"BLUE","phi tbar");
_deltaphi.topdrawOutput(outfile,Frame,"BLACK","Delta phi");
_mpair.topdrawOutput(outfile,Frame|Ylog,"BLACK","M pair");
_etsum.topdrawOutput(outfile,Frame|Ylog,"BLACK","pt sum");
_ptsum.topdrawOutput(outfile,Frame|Ylog,"BLACK","Et sum");
}
void TTbarAnalysis::analyze(tEventPtr event, long, int, int) {
Lorentz5Momentum ptop, ptbar, ppair;
bool foundt = false;
bool foundtbar = false;
tcParticleSet particles;
event->select(inserter(particles), ThePEG::ParticleSelector<TTBar>());
if ( particles.empty() )
return;
for(tcParticleSet::const_iterator it = particles.begin();
it != particles.end(); ++it) {
if((**it).id() == ParticleID::t) {
ptop = (*it)->momentum();
foundt = true;
} else if((**it).id() == ParticleID::tbar) {
ptbar = (*it)->momentum();
foundtbar = true;
}
}
if (foundt && foundtbar) {
ppair = ptop + ptbar;
_pttop += ptop.perp()/GeV;
_pttbar += ptbar.perp()/GeV;
_ptpair += ppair.perp()/GeV;
_ettop += ptop.et()/GeV;
_ettbar += ptbar.et()/GeV;
_etpair += ppair.et()/GeV;
_etop += ptop.e()/GeV;
_etbar += ptbar.e()/GeV;
_epair += ppair.e()/GeV;
_raptop += ptop.rapidity();
_raptbar += ptbar.rapidity();
_rappair += ppair.rapidity();
_phitop += ptop.phi();
_phitbar += ptbar.phi();
_deltaphi += (ptop.vect()).deltaPhi(ptbar.vect());
_mpair += ppair.m()/GeV;
_etsum += (ptop.et() + ptbar.et())/GeV;
_ptsum += (ptop.perp() + ptbar.perp())/GeV;
} else {
cerr << "Analysis/TTbarAnalysis: did not find ttbar pair in event "
<< event->number() << ".\n";
generator()->log() << "Analysis/TTbarAnalysis: "
<< "Found no ttbar pair in event "
<< event->number() << ".\n"
<< *event;
}
}
NoPIOClassDescription<TTbarAnalysis> TTbarAnalysis::initTTbarAnalysis;
// Definition of the static class description member.
void TTbarAnalysis::Init() {
static ClassDocumentation<TTbarAnalysis> documentation
("Standard analysis of a t/tbar pair after showering.");
}

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