Producers/src/ProducerV2SS.cc

// $Id: ProducerV2SS.cc,v 1.15 2009/11/02 22:56:18 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"

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))
{
  // 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);
   
    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(s1.charge() + s2.charge() != 0) continue;

      // do fast helix fit to check if there's any hope
      const reco::Track * t1 = s1.track();
      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:	1.16
Committed:	Tue Dec 1 01:33:39 2009 UTC (15 years, 5 months ago) by bendavid
Content type:	text/plain
Branch:	MAIN
CVS Tags:	Mit_012c
Changes since 1.15:	+40 -26 lines
Log Message:	Replace slow,buggy helix intersector with equivalent cmssw code
#	User	Rev	Content
1	bendavid	1.16	// $Id: ProducerV2SS.cc,v 1.15 2009/11/02 22:56:18 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
20			using namespace std;
21			using namespace edm;
22			using namespace mitedm;
23	bendavid	1.5	using namespace mithep;
24	mrudolph	1.3
25			//--------------------------------------------------------------------------------------------------
26			ProducerV2SS::ProducerV2SS(const ParameterSet& cfg) :
27			ProducerD2SS(cfg),
28	paus	1.10	rhoMin_ (cfg.getUntrackedParameter<double>("minRadius", 0.0)),
29			massMin_ (cfg.getUntrackedParameter<double>("minMass", 0.0)),
30			massMax_ (cfg.getUntrackedParameter<double>("maxMass", 3.0)),
31	bendavid	1.11	dZMax_ (cfg.getUntrackedParameter<double>("maxZDistance",5.0)),
32			useHitDropper_(cfg.getUntrackedParameter<bool>("useHitDropper",true))
33	mrudolph	1.3	{
34	loizides	1.12	// Constructor.
35	mrudolph	1.3	}
36
37			//--------------------------------------------------------------------------------------------------
38			ProducerV2SS::~ProducerV2SS()
39			{
40	loizides	1.12	// Destructor.
41	mrudolph	1.3	}
42
43			//--------------------------------------------------------------------------------------------------
44			void ProducerV2SS::produce(Event &evt, const EventSetup &setup)
45			{
46	loizides	1.12	// Produce the output collection.
47
48	mrudolph	1.3	auto_ptr<DecayPartCol> pD(new DecayPartCol());
49
50			// First input collection
51			Handle<StablePartCol> hStables1;
52			Handle<StablePartCol> hStables2;
53			if (!GetProduct(iStables1_, hStables1, evt) ) {
54			cout << "Couldn't get in collection in Producer V2SS" << endl;
55			evt.put(pD);
56			return;
57			}
58	loizides	1.7	const StablePartCol *pS1 = hStables1.product();
59	mrudolph	1.3
60	loizides	1.7	// Second input collection
61	mrudolph	1.3	if(!GetProduct(iStables2_, hStables2, evt)) {
62			cout << "Couldn't get in collection in Producer V2SS" << endl;
63			evt.put(pD);
64			return;
65			}
66			const StablePartCol *pS2 = hStables2.product();
67	bendavid	1.8
68			//get hit dropper
69			ESHandle<HitDropper> hDropper;
70	bendavid	1.11	const HitDropper *dropper = 0;
71			if (useHitDropper_) {
72			setup.get<HitDropperRecord>().get("HitDropper",hDropper);
73			dropper = hDropper.product();
74			}
75	bendavid	1.15
76			//Get Magnetic Field from event setup, taking value at (0,0,0)
77			edm::ESHandle<MagneticField> magneticField;
78			setup.get<IdealMagneticFieldRecord>().get(magneticField);
79			const double bfield = magneticField->inTesla(GlobalPoint(0.,0.,0.)).z();
80	mrudolph	1.3
81			// -----------------------------------------------------------------------------------------------
82			// Simple double loop
83			// -----------------------------------------------------------------------------------------------
84	loizides	1.7	if (0)
85			cout << "Starting V finder loop" << endl;
86	mrudolph	1.3
87	bendavid	1.16	ClosestApproachInRPhi helixIntersector;
88
89
90	loizides	1.7	//sX_y: X= pion or proton collection.
91			//i, j = 2 loop particles.
92			//ex.: s1_i and s2_i are same particle as pion and proton
93	mrudolph	1.3	for (UInt_t i=0; i<pS1->size(); ++i) {
94			const StablePart &s1 = pS1->at(i);
95
96			UInt_t j;
97			if (iStables1_ == iStables2_)
98			j = i+1;
99			else
100			j = 0;
101
102	bendavid	1.16	TrajectoryStateTransform tsTransform;
103
104			FreeTrajectoryState initialState1 = tsTransform.initialFreeState(s1.track(),&magneticField);
105
106
107	mrudolph	1.3	for (; j<pS2->size(); ++j) {
108			const StablePart &s2 = pS2->at(j);
109
110			if(s1.charge() + s2.charge() != 0) continue;
111
112	loizides	1.12	// do fast helix fit to check if there's any hope
113	mrudolph	1.3	const reco::Track * t1 = s1.track();
114			const reco::Track * t2 = s2.track();
115	bendavid	1.16
116	mrudolph	1.3	double dZ0 = -999;
117			double dR0 = -999;
118	bendavid	1.16	double mass0 = 0.0;
119
120			FreeTrajectoryState initialState2 = tsTransform.initialFreeState(s2.track(),&magneticField);
121			helixIntersector.calculate(initialState1, initialState2);
122			if (helixIntersector.status()) {
123			dZ0 = fabs(helixIntersector.points().first.z() - helixIntersector.points().second.z());
124			dR0 = helixIntersector.crossingPoint().perp();
125
126			GlobalVector v1, v2;
127			v1 = helixIntersector.trajectoryParameters().first.momentum();
128			v2 = helixIntersector.trajectoryParameters().second.momentum();
129
130			double e1 = sqrt(v1.mag2()+s1.mass()*s1.mass());
131			double x1 = v1.x();
132			double y1 = v1.y();
133			double z1 = v1.z();
134
135			double e2 = sqrt(v2.mag2()+s2.mass()*s2.mass());
136			double x2 = v2.x();
137			double y2 = v2.y();
138			double z2 = v2.z();
139
140			FourVector sum(x1+x2, y1+y2, z1+z2, e1+e2);
141
142			mass0 = sqrt(sum.M2());
143			}
144
145
146	loizides	1.12	// Basic cuts on helix intersection
147	mrudolph	1.3	if(mass0 > massMax_ \|\| mass0<massMin_ \|\| fabs(dZ0) > dZMax_ \|\| dR0 < rhoMin_) continue;
148
149			// -------------------------------------------------------------------------------------------
150			// Do vertex fit for all pairs
151	loizides	1.7	// -------------------------------------------------------------------------------------------
152	paus	1.10	mithep::MultiVertexFitterD fit;
153	bendavid	1.15	fit.init(bfield); // Reset to the magnetic field from the event setup
154	mrudolph	1.3	fit.setChisqMax(100);
155			MvfInterface fitInt(&fit);
156	paus	1.10	fitInt.addTrack(s1.track(),1,s1.mass(),mithep::MultiVertexFitterD::VERTEX_1);
157			fitInt.addTrack(s2.track(),2,s2.mass(),mithep::MultiVertexFitterD::VERTEX_1);
158	mrudolph	1.3
159
160			if (fit.fit()){
161
162			DecayPart *d = new DecayPart(oPid_,DecayPart::Fast);
163	bendavid	1.5
164			// Update temporarily some of the quantities (prob, chi2, nDoF, mass, lxy, pt, fourMomentum)
165			d->setProb(fit.prob());
166			d->setChi2(fit.chisq());
167			d->setNdof(fit.ndof());
168
169			FourVector p4Fitted(0.,0.,0.,0.);
170			p4Fitted += fit.getTrackP4(1);
171			p4Fitted += fit.getTrackP4(2);
172			d->setFourMomentum(p4Fitted);
173	paus	1.10	d->setPosition (fit.getVertex (MultiVertexFitterD::VERTEX_1));
174			d->setError (fit.getErrorMatrix(MultiVertexFitterD::VERTEX_1));
175	bendavid	1.5	float mass, massErr;
176			const int trksIds[2] = { 1, 2 };
177			mass = fit.getMass(2,trksIds,massErr);
178
179			ThreeVector p3Fitted(p4Fitted.px(), p4Fitted.py(), p4Fitted.pz());
180
181			//Get decay length in xy plane
182			float dl, dlErr;
183	paus	1.10	dl = fit.getDecayLength (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
184			p3Fitted, dlErr);
185	bendavid	1.5
186			//Get Z decay length
187			float dlz, dlzErr;
188	paus	1.10	dlz = fit.getZDecayLength(MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
189			p3Fitted, dlzErr);
190	bendavid	1.5
191			//get impact parameter
192			float dxy, dxyErr;
193	paus	1.10	dxy = fit.getImpactPar (MultiVertexFitterD::PRIMARY_VERTEX, MultiVertexFitterD::VERTEX_1,
194			p3Fitted, dxyErr);
195	bendavid	1.5
196	bendavid	1.8	BasePartPtr ptr1(hStables1,i);
197			BasePartPtr ptr2(hStables2,j);
198
199	paus	1.10	StableData c1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(), fit.getTrackP4(1).pz(), ptr1);
200			StableData c2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(), fit.getTrackP4(2).pz(), ptr2);
201	bendavid	1.8
202	paus	1.10	const ThreeVector vtxPos = fit.getVertex(MultiVertexFitterD::VERTEX_1);
203			const ThreeVector trkMom1(fit.getTrackP4(1).px(),fit.getTrackP4(1).py(),
204			fit.getTrackP4(1).pz());
205			const ThreeVector trkMom2(fit.getTrackP4(2).px(),fit.getTrackP4(2).py(),
206			fit.getTrackP4(2).pz());
207	bendavid	1.8
208			//build corrected HitPattern for StableData, removing hits before the fit vertex
209	bendavid	1.11	if (useHitDropper_) {
210	bendavid	1.14	reco::HitPattern hits1 = dropper->CorrectedHitsAOD(s1.track(),
211	loizides	1.12	vtxPos,
212			trkMom1,
213			dlErr,
214			dlzErr);
215	bendavid	1.14	reco::HitPattern hits2 = dropper->CorrectedHitsAOD(s2.track(),
216	loizides	1.12	vtxPos,
217			trkMom2,
218			dlErr,
219			dlzErr);
220	bendavid	1.11
221			c1.SetHits(hits1);
222			c2.SetHits(hits2);
223			c1.SetHitsFilled();
224			c2.SetHitsFilled();
225			}
226	bendavid	1.8
227	paus	1.10	d->addStableChild (c1);
228			d->addStableChild (c2);
229			d->setFittedMass (mass);
230	bendavid	1.5	d->setFittedMassError(massErr);
231	paus	1.10	d->setLxy (dl);
232			d->setLxyError (dlErr);
233			d->setLxyToPv (dl);
234			d->setLxyToPvError (dlErr);
235			d->setLz (dlz);
236			d->setLzError (dlzErr);
237			d->setLzToPv (dlz);
238			d->setLzToPvError (dlzErr);
239			d->setDxy (dxy);
240			d->setDxyError (dxyErr);
241			d->setDxyToPv (dxy);
242			d->setDxyToPvError (dxyErr);
243
244	loizides	1.12	// put the result into our collection
245	mrudolph	1.3	pD->push_back(*d);
246	loizides	1.13	delete d;
247	mrudolph	1.3	} //done processing fit
248	loizides	1.7	} //end j loop
249	mrudolph	1.3	} //end i loop
250
251			// -----------------------------------------------------------------------------------------------
252			// Write the collection even if it is empty
253			// -----------------------------------------------------------------------------------------------
254	loizides	1.7	if (0)
255			cout << " V2SS::produce - " << pD->size() << " entries collection created -"
256			<< " (Pid: " << oPid_ << ")\n";
257	mrudolph	1.3	evt.put(pD);
258			}
259
260	loizides	1.12	// define this as a plug-in
261	mrudolph	1.3	DEFINE_FWK_MODULE(ProducerV2SS);