Producers/src/ProducerV2SS.cc

// $Id: ProducerV2SS.cc,v 1.18 2009/12/08 17:40:04 bendavid Exp $

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
#include "TrackingTools/PatternTools/interface/ClosestApproachInRPhi.h"
#include "MitEdm/Producers/interface/HitDropperRecord.h"
#include "MitEdm/Producers/interface/HitDropper.h"
#include "MitEdm/DataFormats/interface/Types.h"
#include "MitEdm/DataFormats/interface/Collections.h"
#include "MitEdm/DataFormats/interface/DecayPart.h"
#include "MitEdm/DataFormats/interface/StablePart.h"
#include "MitEdm/DataFormats/interface/StableData.h"
#include "MitEdm/VertexFitInterface/interface/MvfInterface.h"
#include "MitEdm/Producers/interface/ProducerV2SS.h"
#include <TMath.h>

using namespace std;
using namespace edm;
using namespace mitedm;
using namespace mithep;

//--------------------------------------------------------------------------------------------------
ProducerV2SS::ProducerV2SS(const ParameterSet& cfg) :
  ProducerD2SS(cfg),
  rhoMin_     (cfg.getUntrackedParameter<double>("minRadius",   0.0)),
  massMin_    (cfg.getUntrackedParameter<double>("minMass",     0.0)),
  massMax_    (cfg.getUntrackedParameter<double>("maxMass",     3.0)),
  dZMax_      (cfg.getUntrackedParameter<double>("maxZDistance",5.0)),
  useHitDropper_(cfg.getUntrackedParameter<bool>("useHitDropper",true)),
  applyChargeConstraint_(cfg.getUntrackedParameter<bool>  ("applyChargeConstraint",false))
{
  // Constructor.
}

//--------------------------------------------------------------------------------------------------
ProducerV2SS::~ProducerV2SS()
{
  // Destructor.
}

//--------------------------------------------------------------------------------------------------
void ProducerV2SS::produce(Event &evt, const EventSetup &setup)
{
  // Produce the output collection.

  auto_ptr<DecayPartCol> pD(new DecayPartCol());

  // First input collection
  Handle<StablePartCol> hStables1;
  Handle<StablePartCol> hStables2;
  if (!GetProduct(iStables1_, hStables1, evt) ) {
    cout << "Couldn't get in collection in Producer V2SS" << endl;
    evt.put(pD);
    return;  
  }
  const StablePartCol *pS1 = hStables1.product();

  // Second input collection
  if(!GetProduct(iStables2_, hStables2, evt)) {
    cout << "Couldn't get in collection in Producer V2SS" << endl;
    evt.put(pD);
    return;  
  }
  const StablePartCol *pS2 = hStables2.product();
  
  //get hit dropper
  ESHandle<HitDropper> hDropper;
  const HitDropper *dropper = 0;
  if (useHitDropper_) {
    setup.get<HitDropperRecord>().get("HitDropper",hDropper);
    dropper = hDropper.product();
  }
  
  //Get Magnetic Field from event setup, taking value at (0,0,0)
  edm::ESHandle<MagneticField> magneticField;
  setup.get<IdealMagneticFieldRecord>().get(magneticField);
  const double bfield = magneticField->inTesla(GlobalPoint(0.,0.,0.)).z();

  // -----------------------------------------------------------------------------------------------
  // Simple double loop
  // -----------------------------------------------------------------------------------------------
  if (0)
    cout << "Starting V finder loop" << endl;

  ClosestApproachInRPhi helixIntersector;
  
  
  //sX_y: X= pion or proton collection.  
  //i, j = 2 loop particles. 
  //ex.: s1_i and s2_i are same particle as pion and proton
  for (UInt_t i=0; i<pS1->size(); ++i) {
    const StablePart &s1 =  pS1->at(i);
   
    //const reco::Track * t1 = s1.track();
    
    UInt_t j;
    if (iStables1_ == iStables2_)
      j = i+1; 
    else
      j = 0;
    
    TrajectoryStateTransform tsTransform;
    
    FreeTrajectoryState initialState1 = tsTransform.initialFreeState(*s1.track(),&*magneticField);
  
    
    for (; j<pS2->size(); ++j) {
      const StablePart &s2 = pS2->at(j);

      if( applyChargeConstraint_ && (s1.charge() + s2.charge() != 0) ) continue;

      // do fast helix fit to check if there's any hope
      //
      //const reco::Track * t2 = s2.track();
         
      double dZ0 = -999;
      double dR0 = -999;
      double mass0 = 0.0;
      
      FreeTrajectoryState initialState2 = tsTransform.initialFreeState(*s2.track(),&*magneticField);
      helixIntersector.calculate(initialState1, initialState2);
      if (helixIntersector.status()) {
        dZ0 = fabs(helixIntersector.points().first.z() - helixIntersector.points().second.z());
        dR0 = helixIntersector.crossingPoint().perp();
        
        GlobalVector     v1, v2;
        v1 = helixIntersector.trajectoryParameters().first.momentum();
        v2 = helixIntersector.trajectoryParameters().second.momentum();

        double e1 = sqrt(v1.mag2()+s1.mass()*s1.mass());
        double x1 = v1.x();
        double y1 = v1.y();
        double z1 = v1.z();

        double e2 = sqrt(v2.mag2()+s2.mass()*s2.mass());
        double x2 = v2.x();
        double y2 = v2.y();
        double z2 = v2.z();

        FourVector sum(x1+x2, y1+y2, z1+z2, e1+e2);

        mass0 = sqrt(sum.M2());
      }
      
      
      // Basic cuts on helix intersection
      if(mass0 > massMax_ || mass0<massMin_ || fabs(dZ0) > dZMax_ || dR0 < rhoMin_) continue;

      // -------------------------------------------------------------------------------------------
      // Do vertex fit for all pairs
      // -------------------------------------------------------------------------------------------
      mithep::MultiVertexFitterD fit;
      fit.init(bfield); // Reset to the magnetic field from the event setup
      fit.setChisqMax(100);
      MvfInterface fitInt(&fit);
      fitInt.addTrack(s1.track(),1,s1.mass(),mithep::MultiVertexFitterD::VERTEX_1);
      fitInt.addTrack(s2.track(),2,s2.mass(),mithep::MultiVertexFitterD::VERTEX_1);


      if (fit.fit()){

        DecayPart *d = new DecayPart(oPid_,DecayPart::Fast);

        // Update temporarily some of the quantities (prob, chi2, nDoF, mass, lxy, pt, fourMomentum)
        d->setProb(fit.prob());
        d->setChi2(fit.chisq());
        d->setNdof(fit.ndof());

        FourVector p4Fitted(0.,0.,0.,0.);
        p4Fitted += fit.getTrackP4(1);
        p4Fitted += fit.getTrackP4(2);
        d->setFourMomentum(p4Fitted);
        d->setPosition    (fit.getVertex     (MultiVertexFitterD::VERTEX_1));
        d->setError       (fit.getErrorMatrix(MultiVertexFitterD::VERTEX_1));
        float mass, massErr;
        const int trksIds[2] = { 1, 2 };
        mass = fit.getMass(2,trksIds,massErr);
        
        ThreeVector p3Fitted(p4Fitted.px(), p4Fitted.py(), p4Fitted.pz());
        
        //Get decay length in xy plane
        float dl, dlErr;
        dl = fit.getDecayLength  (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
                                  p3Fitted, dlErr);
               
        //Get Z decay length               
        float dlz, dlzErr;
        dlz = fit.getZDecayLength(MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
                                  p3Fitted, dlzErr);
               
        //get impact parameter               
        float dxy, dxyErr;
        dxy = fit.getImpactPar   (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
                                  p3Fitted, dxyErr);

        BasePartPtr ptr1(hStables1,i);
        BasePartPtr ptr2(hStables2,j);       
        
        StableData  c1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(), fit.getTrackP4(1).pz(), ptr1);
        StableData  c2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(), fit.getTrackP4(2).pz(), ptr2);
        
        const ThreeVector vtxPos = fit.getVertex(MultiVertexFitterD::VERTEX_1);
        const ThreeVector trkMom1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(),
                                  fit.getTrackP4(1).pz());
        const ThreeVector trkMom2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(),
                                  fit.getTrackP4(2).pz());
        
        //build corrected HitPattern for StableData, removing hits before the fit vertex
        if (useHitDropper_) {
          reco::HitPattern hits1 = dropper->CorrectedHitsAOD(s1.track(), 
                                                          vtxPos, 
                                                          trkMom1, 
                                                          dlErr, 
                                                          dlzErr);
          reco::HitPattern hits2 = dropper->CorrectedHitsAOD(s2.track(), 
                                                          vtxPos, 
                                                          trkMom2, 
                                                          dlErr, 
                                                          dlzErr);
          
          c1.SetHits(hits1);
          c2.SetHits(hits2);
          c1.SetHitsFilled();
          c2.SetHitsFilled();
        }
        
        d->addStableChild    (c1);
        d->addStableChild    (c2);               
        d->setFittedMass     (mass);
        d->setFittedMassError(massErr);
        d->setLxy            (dl);
        d->setLxyError       (dlErr);
        d->setLxyToPv        (dl);
        d->setLxyToPvError   (dlErr);
        d->setLz             (dlz);
        d->setLzError        (dlzErr);
        d->setLzToPv         (dlz);
        d->setLzToPvError    (dlzErr);
        d->setDxy            (dxy);
        d->setDxyError       (dxyErr);
        d->setDxyToPv        (dxy);
        d->setDxyToPvError   (dxyErr);

        // put the result into our collection
        pD->push_back(*d);
        delete d;
      }  //done processing fit
    } //end j loop
  } //end i loop

  // -----------------------------------------------------------------------------------------------
  // Write the collection even if it is empty
  // -----------------------------------------------------------------------------------------------
  if (0)
    cout << " V2SS::produce - " << pD->size() << " entries collection created -"
         << " (Pid: " << oPid_ << ")\n";
  evt.put(pD);
}

// define this as a plug-in
DEFINE_FWK_MODULE(ProducerV2SS);
Revision:	1.19
Committed:	Fri Dec 11 17:46:24 2009 UTC (15 years, 5 months ago) by bendavid
Content type:	text/plain
Branch:	MAIN
CVS Tags:	Mit_012f, Mit_012e
Changes since 1.18:	+5 -13 lines
Log Message:	Remove track quality cuts, which do not really belong here
#	User	Rev	Content
1	bendavid	1.19	// $Id: ProducerV2SS.cc,v 1.18 2009/12/08 17:40:04 bendavid Exp $
2	loizides	1.7
3	mrudolph	1.3	#include "DataFormats/Common/interface/Handle.h"
4			#include "DataFormats/TrackReco/interface/Track.h"
5			#include "DataFormats/TrackReco/interface/TrackFwd.h"
6	bendavid	1.15	#include "MagneticField/Engine/interface/MagneticField.h"
7			#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"
8	bendavid	1.16	#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"
9			#include "TrackingTools/PatternTools/interface/ClosestApproachInRPhi.h"
10	bendavid	1.8	#include "MitEdm/Producers/interface/HitDropperRecord.h"
11			#include "MitEdm/Producers/interface/HitDropper.h"
12	mrudolph	1.3	#include "MitEdm/DataFormats/interface/Types.h"
13	mrudolph	1.4	#include "MitEdm/DataFormats/interface/Collections.h"
14	mrudolph	1.3	#include "MitEdm/DataFormats/interface/DecayPart.h"
15			#include "MitEdm/DataFormats/interface/StablePart.h"
16	bendavid	1.5	#include "MitEdm/DataFormats/interface/StableData.h"
17	mrudolph	1.3	#include "MitEdm/VertexFitInterface/interface/MvfInterface.h"
18			#include "MitEdm/Producers/interface/ProducerV2SS.h"
19	bendavid	1.18	#include <TMath.h>
20	mrudolph	1.3
21			using namespace std;
22			using namespace edm;
23			using namespace mitedm;
24	bendavid	1.5	using namespace mithep;
25	mrudolph	1.3
26			//--------------------------------------------------------------------------------------------------
27			ProducerV2SS::ProducerV2SS(const ParameterSet& cfg) :
28			ProducerD2SS(cfg),
29	paus	1.10	rhoMin_ (cfg.getUntrackedParameter<double>("minRadius", 0.0)),
30			massMin_ (cfg.getUntrackedParameter<double>("minMass", 0.0)),
31			massMax_ (cfg.getUntrackedParameter<double>("maxMass", 3.0)),
32	bendavid	1.11	dZMax_ (cfg.getUntrackedParameter<double>("maxZDistance",5.0)),
33	bendavid	1.18	useHitDropper_(cfg.getUntrackedParameter<bool>("useHitDropper",true)),
34	bendavid	1.19	applyChargeConstraint_(cfg.getUntrackedParameter<bool> ("applyChargeConstraint",false))
35	mrudolph	1.3	{
36	loizides	1.12	// Constructor.
37	mrudolph	1.3	}
38
39			//--------------------------------------------------------------------------------------------------
40			ProducerV2SS::~ProducerV2SS()
41			{
42	loizides	1.12	// Destructor.
43	mrudolph	1.3	}
44
45			//--------------------------------------------------------------------------------------------------
46			void ProducerV2SS::produce(Event &evt, const EventSetup &setup)
47			{
48	loizides	1.12	// Produce the output collection.
49
50	mrudolph	1.3	auto_ptr<DecayPartCol> pD(new DecayPartCol());
51
52			// First input collection
53			Handle<StablePartCol> hStables1;
54			Handle<StablePartCol> hStables2;
55			if (!GetProduct(iStables1_, hStables1, evt) ) {
56			cout << "Couldn't get in collection in Producer V2SS" << endl;
57			evt.put(pD);
58			return;
59			}
60	loizides	1.7	const StablePartCol *pS1 = hStables1.product();
61	mrudolph	1.3
62	loizides	1.7	// Second input collection
63	mrudolph	1.3	if(!GetProduct(iStables2_, hStables2, evt)) {
64			cout << "Couldn't get in collection in Producer V2SS" << endl;
65			evt.put(pD);
66			return;
67			}
68			const StablePartCol *pS2 = hStables2.product();
69	bendavid	1.8
70			//get hit dropper
71			ESHandle<HitDropper> hDropper;
72	bendavid	1.11	const HitDropper *dropper = 0;
73			if (useHitDropper_) {
74			setup.get<HitDropperRecord>().get("HitDropper",hDropper);
75			dropper = hDropper.product();
76			}
77	bendavid	1.15
78			//Get Magnetic Field from event setup, taking value at (0,0,0)
79			edm::ESHandle<MagneticField> magneticField;
80			setup.get<IdealMagneticFieldRecord>().get(magneticField);
81			const double bfield = magneticField->inTesla(GlobalPoint(0.,0.,0.)).z();
82	mrudolph	1.3
83			// -----------------------------------------------------------------------------------------------
84			// Simple double loop
85			// -----------------------------------------------------------------------------------------------
86	loizides	1.7	if (0)
87			cout << "Starting V finder loop" << endl;
88	mrudolph	1.3
89	bendavid	1.16	ClosestApproachInRPhi helixIntersector;
90
91
92	loizides	1.7	//sX_y: X= pion or proton collection.
93			//i, j = 2 loop particles.
94			//ex.: s1_i and s2_i are same particle as pion and proton
95	mrudolph	1.3	for (UInt_t i=0; i<pS1->size(); ++i) {
96			const StablePart &s1 = pS1->at(i);
97
98	bendavid	1.19	//const reco::Track * t1 = s1.track();
99	bendavid	1.18
100	mrudolph	1.3	UInt_t j;
101			if (iStables1_ == iStables2_)
102			j = i+1;
103			else
104			j = 0;
105
106	bendavid	1.16	TrajectoryStateTransform tsTransform;
107
108			FreeTrajectoryState initialState1 = tsTransform.initialFreeState(s1.track(),&magneticField);
109
110
111	mrudolph	1.3	for (; j<pS2->size(); ++j) {
112			const StablePart &s2 = pS2->at(j);
113
114	bendavid	1.18	if( applyChargeConstraint_ && (s1.charge() + s2.charge() != 0) ) continue;
115	mrudolph	1.3
116	loizides	1.12	// do fast helix fit to check if there's any hope
117	bendavid	1.18	//
118	bendavid	1.19	//const reco::Track * t2 = s2.track();
119
120	mrudolph	1.3	double dZ0 = -999;
121			double dR0 = -999;
122	bendavid	1.16	double mass0 = 0.0;
123
124			FreeTrajectoryState initialState2 = tsTransform.initialFreeState(s2.track(),&magneticField);
125			helixIntersector.calculate(initialState1, initialState2);
126			if (helixIntersector.status()) {
127			dZ0 = fabs(helixIntersector.points().first.z() - helixIntersector.points().second.z());
128			dR0 = helixIntersector.crossingPoint().perp();
129
130			GlobalVector v1, v2;
131			v1 = helixIntersector.trajectoryParameters().first.momentum();
132			v2 = helixIntersector.trajectoryParameters().second.momentum();
133
134			double e1 = sqrt(v1.mag2()+s1.mass()*s1.mass());
135			double x1 = v1.x();
136			double y1 = v1.y();
137			double z1 = v1.z();
138
139			double e2 = sqrt(v2.mag2()+s2.mass()*s2.mass());
140			double x2 = v2.x();
141			double y2 = v2.y();
142			double z2 = v2.z();
143
144			FourVector sum(x1+x2, y1+y2, z1+z2, e1+e2);
145
146			mass0 = sqrt(sum.M2());
147			}
148
149
150	loizides	1.12	// Basic cuts on helix intersection
151	mrudolph	1.3	if(mass0 > massMax_ \|\| mass0<massMin_ \|\| fabs(dZ0) > dZMax_ \|\| dR0 < rhoMin_) continue;
152
153			// -------------------------------------------------------------------------------------------
154			// Do vertex fit for all pairs
155	loizides	1.7	// -------------------------------------------------------------------------------------------
156	paus	1.10	mithep::MultiVertexFitterD fit;
157	bendavid	1.15	fit.init(bfield); // Reset to the magnetic field from the event setup
158	mrudolph	1.3	fit.setChisqMax(100);
159			MvfInterface fitInt(&fit);
160	paus	1.10	fitInt.addTrack(s1.track(),1,s1.mass(),mithep::MultiVertexFitterD::VERTEX_1);
161			fitInt.addTrack(s2.track(),2,s2.mass(),mithep::MultiVertexFitterD::VERTEX_1);
162	mrudolph	1.3
163
164			if (fit.fit()){
165
166			DecayPart *d = new DecayPart(oPid_,DecayPart::Fast);
167	bendavid	1.5
168			// Update temporarily some of the quantities (prob, chi2, nDoF, mass, lxy, pt, fourMomentum)
169			d->setProb(fit.prob());
170			d->setChi2(fit.chisq());
171			d->setNdof(fit.ndof());
172
173			FourVector p4Fitted(0.,0.,0.,0.);
174			p4Fitted += fit.getTrackP4(1);
175			p4Fitted += fit.getTrackP4(2);
176			d->setFourMomentum(p4Fitted);
177	paus	1.10	d->setPosition (fit.getVertex (MultiVertexFitterD::VERTEX_1));
178			d->setError (fit.getErrorMatrix(MultiVertexFitterD::VERTEX_1));
179	bendavid	1.5	float mass, massErr;
180			const int trksIds[2] = { 1, 2 };
181			mass = fit.getMass(2,trksIds,massErr);
182
183			ThreeVector p3Fitted(p4Fitted.px(), p4Fitted.py(), p4Fitted.pz());
184
185			//Get decay length in xy plane
186			float dl, dlErr;
187	paus	1.10	dl = fit.getDecayLength (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
188			p3Fitted, dlErr);
189	bendavid	1.5
190			//Get Z decay length
191			float dlz, dlzErr;
192	paus	1.10	dlz = fit.getZDecayLength(MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
193			p3Fitted, dlzErr);
194	bendavid	1.5
195			//get impact parameter
196			float dxy, dxyErr;
197	paus	1.10	dxy = fit.getImpactPar (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
198			p3Fitted, dxyErr);
199	bendavid	1.5
200	bendavid	1.8	BasePartPtr ptr1(hStables1,i);
201			BasePartPtr ptr2(hStables2,j);
202
203	paus	1.10	StableData c1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(), fit.getTrackP4(1).pz(), ptr1);
204			StableData c2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(), fit.getTrackP4(2).pz(), ptr2);
205	bendavid	1.8
206	paus	1.10	const ThreeVector vtxPos = fit.getVertex(MultiVertexFitterD::VERTEX_1);
207			const ThreeVector trkMom1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(),
208			fit.getTrackP4(1).pz());
209			const ThreeVector trkMom2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(),
210			fit.getTrackP4(2).pz());
211	bendavid	1.8
212			//build corrected HitPattern for StableData, removing hits before the fit vertex
213	bendavid	1.11	if (useHitDropper_) {
214	bendavid	1.14	reco::HitPattern hits1 = dropper->CorrectedHitsAOD(s1.track(),
215	loizides	1.12	vtxPos,
216			trkMom1,
217			dlErr,
218			dlzErr);
219	bendavid	1.14	reco::HitPattern hits2 = dropper->CorrectedHitsAOD(s2.track(),
220	loizides	1.12	vtxPos,
221			trkMom2,
222			dlErr,
223			dlzErr);
224	bendavid	1.11
225			c1.SetHits(hits1);
226			c2.SetHits(hits2);
227			c1.SetHitsFilled();
228			c2.SetHitsFilled();
229			}
230	bendavid	1.8
231	paus	1.10	d->addStableChild (c1);
232			d->addStableChild (c2);
233			d->setFittedMass (mass);
234	bendavid	1.5	d->setFittedMassError(massErr);
235	paus	1.10	d->setLxy (dl);
236			d->setLxyError (dlErr);
237			d->setLxyToPv (dl);
238			d->setLxyToPvError (dlErr);
239			d->setLz (dlz);
240			d->setLzError (dlzErr);
241			d->setLzToPv (dlz);
242			d->setLzToPvError (dlzErr);
243			d->setDxy (dxy);
244			d->setDxyError (dxyErr);
245			d->setDxyToPv (dxy);
246			d->setDxyToPvError (dxyErr);
247
248	loizides	1.12	// put the result into our collection
249	mrudolph	1.3	pD->push_back(*d);
250	loizides	1.13	delete d;
251	mrudolph	1.3	} //done processing fit
252	loizides	1.7	} //end j loop
253	mrudolph	1.3	} //end i loop
254
255			// -----------------------------------------------------------------------------------------------
256			// Write the collection even if it is empty
257			// -----------------------------------------------------------------------------------------------
258	loizides	1.7	if (0)
259			cout << " V2SS::produce - " << pD->size() << " entries collection created -"
260			<< " (Pid: " << oPid_ << ")\n";
261	mrudolph	1.3	evt.put(pD);
262			}
263
264	loizides	1.12	// define this as a plug-in
265	mrudolph	1.3	DEFINE_FWK_MODULE(ProducerV2SS);