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root/cvsroot/UserCode/MitPhysics/Utils/src/IsolationTools.cc
Revision: 1.16
Committed: Thu May 12 16:08:36 2011 UTC (13 years, 11 months ago) by sixie
Content type: text/plain
Branch: MAIN
Changes since 1.15: +61 -3 lines
Log Message:
modify pfiso for ele

File Contents

# User Rev Content
1 sixie 1.16 // $Id: IsolationTools.cc,v 1.15 2011/05/12 12:26:42 mzanetti Exp $
2 loizides 1.1
3     #include "MitPhysics/Utils/interface/IsolationTools.h"
4 bendavid 1.11 #include "MitPhysics/Utils/interface/PhotonTools.h"
5 loizides 1.1 #include "MitCommon/MathTools/interface/MathUtils.h"
6    
7 loizides 1.4 ClassImp(mithep::IsolationTools)
8    
9 loizides 1.1 using namespace mithep;
10    
11     //--------------------------------------------------------------------------------------------------
12     Double_t IsolationTools::TrackIsolation(const Track *p, Double_t extRadius, Double_t intRadius,
13     Double_t ptLow, Double_t maxVtxZDist,
14 phedex 1.2 const Collection<Track> *tracks)
15 loizides 1.1 {
16     //Computes the Track Isolation: Summed Transverse Momentum of all tracks inside an
17     //annulus around the electron seed track.
18    
19     Double_t ptSum =0.;
20     for (UInt_t i=0; i<tracks->GetEntries();i++) {
21     Double_t tmpPt = tracks->At(i)->Pt();
22     Double_t deltaZ = fabs(p->Z0() - tracks->At(i)->Z0());
23    
24     //ignore the track if it is below the pt threshold
25     if (tmpPt < ptLow)
26     continue;
27     //ingore the track if it is too far away in Z
28     if (deltaZ > maxVtxZDist)
29     continue;
30    
31 phedex 1.2 Double_t dr = MathUtils::DeltaR(p->Phi(),p->Eta(),tracks->At(i)->Phi(), tracks->At(i)->Eta());
32 loizides 1.1 //add the track pt if it is inside the annulus
33     if ( dr < extRadius &&
34     dr >= intRadius ) {
35     ptSum += tmpPt;
36     }
37     }
38     return ptSum;
39     }
40    
41     //--------------------------------------------------------------------------------------------------
42     Double_t IsolationTools::EcalIsolation(const SuperCluster *sc, Double_t coneSize, Double_t etLow,
43 phedex 1.2 const Collection<BasicCluster> *basicClusters)
44 loizides 1.1 {
45     //Computes the Ecal Isolation: Summed Transverse Energy of all Basic Clusters inside a
46     //cone around the electron, excluding those that are inside the electron super cluster.
47    
48     Double_t ecalIsol=0.;
49     const BasicCluster *basicCluster= 0;
50     for (UInt_t i=0; i<basicClusters->GetEntries();i++) {
51     basicCluster = basicClusters->At(i);
52     Double_t basicClusterEnergy = basicCluster->Energy();
53     Double_t basicClusterEta = basicCluster->Eta();
54     Double_t basicClusterEt = basicClusterEnergy*sin(2*atan(exp(basicClusterEta)));
55    
56 bendavid 1.3 if (basicClusterEt > etLow) {
57 loizides 1.1 bool inSuperCluster = false;
58    
59     // loop over the basic clusters of the supercluster
60     // to make sure that the basic cluster is not inside
61     // the super cluster. We exclude those.
62     for (UInt_t j=0; j<sc->ClusterSize(); j++) {
63     const BasicCluster *tempBasicClusterInSuperCluster = sc->Cluster(j);
64     if (tempBasicClusterInSuperCluster == basicCluster) {
65     inSuperCluster = true;
66     }
67     }
68    
69     if (!inSuperCluster) {
70 phedex 1.2 Double_t dr = MathUtils::DeltaR(sc->Phi(), sc->Eta(),
71     basicCluster->Phi(),basicCluster->Eta());
72 loizides 1.1 if(dr < coneSize) {
73     ecalIsol += basicClusterEt;
74     }
75     }
76     }
77     }
78     return ecalIsol;
79     }
80    
81     //--------------------------------------------------------------------------------------------------
82     Double_t IsolationTools::CaloTowerHadIsolation(const ThreeVector *p, Double_t extRadius,
83     Double_t intRadius, Double_t etLow,
84 phedex 1.2 const Collection<CaloTower> *caloTowers)
85 loizides 1.1 {
86     //Computes the CaloTower Had Et Isolation: Summed Hadronic Transverse Energy of all Calo Towers
87     //inside an annulus around the electron super cluster position.
88    
89     Double_t sumEt = 0;
90     for (UInt_t i=0; i<caloTowers->GetEntries();i++) {
91     Double_t caloTowerEt = caloTowers->At(i)->HadEt();
92     Double_t dr = MathUtils::DeltaR(caloTowers->At(i)->Phi(), caloTowers->At(i)->Eta(),
93     p->Phi(), p->Eta());
94     if (dr < extRadius && dr > intRadius && caloTowerEt > etLow) {
95     sumEt += caloTowerEt;
96     }
97     }
98     return sumEt;
99     }
100    
101     //--------------------------------------------------------------------------------------------------
102     Double_t IsolationTools::CaloTowerEmIsolation(const ThreeVector *p, Double_t extRadius,
103     Double_t intRadius, Double_t etLow,
104 phedex 1.2 const Collection<CaloTower> *caloTowers)
105 loizides 1.1 {
106     //Computes the CaloTower Em Et Isolation: Summed Hadronic Transverse Energy of all Calo Towers
107     //inside an annulus around the electron super cluster position.
108    
109     Double_t sumEt = 0;
110     for (UInt_t i=0; i<caloTowers->GetEntries();i++) {
111     Double_t caloTowerEt = caloTowers->At(i)->EmEt();
112     Double_t dr = MathUtils::DeltaR(caloTowers->At(i)->Phi(), caloTowers->At(i)->Eta(),
113     p->Phi(), p->Eta());
114     if (dr < extRadius && dr > intRadius && caloTowerEt > etLow) {
115     sumEt += caloTowerEt;
116     }
117     }
118     return sumEt;
119     }
120 ceballos 1.5
121     //--------------------------------------------------------------------------------------------------
122     Double_t IsolationTools::PFMuonIsolation(const Muon *p, const Collection<PFCandidate> *PFCands,
123 ceballos 1.8 const Vertex *vertex, Double_t delta_z, Double_t ptMin,
124 mzanetti 1.15 Double_t extRadius, Double_t intRadius)
125     {
126     //Computes the PF Isolation: Summed Transverse Momentum of all PF candidates inside an
127     //annulus around the particle seed track.
128    
129     Double_t zLepton = 0.0;
130     if(p->BestTrk()) zLepton = p->BestTrk()->DzCorrected(*vertex);
131    
132     Double_t ptSum =0.;
133     for (UInt_t i=0; i<PFCands->GetEntries();i++) {
134     const PFCandidate *pf = PFCands->At(i);
135    
136     // pt cut applied to neutrals
137     if(!pf->HasTrk() && pf->Pt() <= ptMin) continue;
138    
139     // exclude muon
140     if(pf->TrackerTrk() && p->TrackerTrk() &&
141     pf->TrackerTrk() == p->TrackerTrk()) continue;
142    
143     // ignore the pf candidate if it is too far away in Z
144     Double_t deltaZ = 0.0;
145     if(pf->HasTrk()) {
146     deltaZ = TMath::Abs(pf->BestTrk()->DzCorrected(*vertex) - zLepton);
147     }
148     if (deltaZ >= delta_z)
149     continue;
150    
151     // add the pf pt if it is inside the extRadius and outside the intRadius
152     Double_t dr = MathUtils::DeltaR(p->Mom(), pf->Mom());
153     if ( dr < extRadius && dr >= intRadius ) ptSum += pf->Pt();
154    
155     }
156     return ptSum;
157     }
158    
159     //--------------------------------------------------------------------------------------------------
160     Double_t IsolationTools::PFMuonIsolation(const Muon *p, const Collection<PFCandidate> *PFCands, const Vertex *vertex,
161     const MuonCol *goodMuons, const ElectronCol *goodElectrons,
162     Double_t delta_z, Double_t ptMin, Double_t extRadius,
163     Double_t intRadius, int isoType, Double_t beta)
164 ceballos 1.5 {
165     //Computes the PF Isolation: Summed Transverse Momentum of all PF candidates inside an
166     //annulus around the particle seed track.
167    
168     Double_t zLepton = 0.0;
169 ceballos 1.8 if(p->BestTrk()) zLepton = p->BestTrk()->DzCorrected(*vertex);
170 ceballos 1.5
171     Double_t ptSum =0.;
172     for (UInt_t i=0; i<PFCands->GetEntries();i++) {
173     const PFCandidate *pf = PFCands->At(i);
174    
175     Bool_t isGoodType = kFALSE;
176     // all particles
177 ceballos 1.6 if (isoType == 0) isGoodType = kTRUE;
178 ceballos 1.5 // charged particles only
179 ceballos 1.6 else if(isoType == 1 && pf->BestTrk()) isGoodType = kTRUE;
180 ceballos 1.5 // charged particles and gammas only
181 ceballos 1.6 else if(isoType == 2 &&
182     (pf->BestTrk() || pf->PFType() == PFCandidate::eGamma)) isGoodType = kTRUE;
183 ceballos 1.8 // all particles, rejecting good leptons
184     else if(isoType == 3) isGoodType = kTRUE;
185 ceballos 1.5
186     if(isGoodType == kFALSE) continue;
187    
188 mzanetti 1.13 // 0.1 pt cut applied to charged
189 ceballos 1.12 if( pf->BestTrk() && pf->Pt() <= 0.1) continue;
190 mzanetti 1.13 // pt cut applied to neutrals
191     if(!pf->HasTrk() && pf->Pt() <= ptMin) continue;
192 ceballos 1.6
193 ceballos 1.5 if(pf->TrackerTrk() && p->TrackerTrk() &&
194     pf->TrackerTrk() == p->TrackerTrk()) continue;
195    
196     Double_t deltaZ = 0.0;
197     if(pf->BestTrk()) {
198 ceballos 1.8 deltaZ = TMath::Abs(pf->BestTrk()->DzCorrected(*vertex) - zLepton);
199 ceballos 1.5 }
200    
201     // ignore the pf candidate if it is too far away in Z
202 ceballos 1.6 if (deltaZ >= delta_z)
203 ceballos 1.5 continue;
204    
205     Double_t dr = MathUtils::DeltaR(p->Mom(), pf->Mom());
206     // add the pf pt if it is inside the extRadius and outside the intRadius
207     if ( dr < extRadius &&
208     dr >= intRadius ) {
209 ceballos 1.8 Bool_t isLepton = kFALSE;
210     if(goodMuons && isoType == 3){
211     for (UInt_t nl=0; nl<goodMuons->GetEntries();nl++) {
212     const Muon *m = goodMuons->At(nl);
213     if(pf->TrackerTrk() && m->TrackerTrk() &&
214     pf->TrackerTrk() == m->TrackerTrk()) {
215     isLepton = kTRUE;
216     break;
217     }
218     }
219     }
220     if(goodElectrons && isLepton == kFALSE && isoType == 3){
221     for (UInt_t nl=0; nl<goodElectrons->GetEntries();nl++) {
222     const Electron *e = goodElectrons->At(nl);
223     if(pf->TrackerTrk() && e->TrackerTrk() &&
224     pf->TrackerTrk() == e->TrackerTrk()) {
225     isLepton = kTRUE;
226     break;
227     }
228     if(pf->GsfTrk() && e->GsfTrk() &&
229     pf->GsfTrk() == e->GsfTrk()) {
230     isLepton = kTRUE;
231     break;
232     }
233     }
234     }
235     if(isLepton == kFALSE){
236     if(pf->BestTrk()) ptSum += pf->Pt();
237     else ptSum += pf->Pt()*beta;
238     }
239 ceballos 1.5 }
240     }
241     return ptSum;
242     }
243 mzanetti 1.15
244 ceballos 1.5 //--------------------------------------------------------------------------------------------------
245     Double_t IsolationTools::PFElectronIsolation(const Electron *p, const PFCandidateCol *PFCands,
246 ceballos 1.8 const Vertex *vertex, Double_t delta_z, Double_t ptMin,
247 sixie 1.16 Double_t extRadius, Double_t intRadius)
248     {
249    
250     //Computes the PF Isolation: Summed Transverse Momentum of all PF candidates inside an
251     //annulus around the particle seed track.
252    
253     Double_t zLepton = 0.0;
254     if(p->BestTrk()) zLepton = p->BestTrk()->DzCorrected(*vertex);
255    
256     Double_t ptSum =0.;
257     for (UInt_t i=0; i<PFCands->GetEntries();i++) {
258     const PFCandidate *pf = PFCands->At(i);
259    
260     // 0.1 pt cut applied to charged
261     if( pf->BestTrk() && pf->Pt() <= 0.1) continue;
262    
263     // pt cut applied to neutrals
264     if(!pf->HasTrk() && pf->Pt() <= ptMin) continue;
265    
266     if(pf->TrackerTrk() && p->TrackerTrk() &&
267     pf->TrackerTrk() == p->TrackerTrk()) continue;
268    
269     if(pf->GsfTrk() && p->GsfTrk() &&
270     pf->GsfTrk() == p->GsfTrk()) continue;
271    
272     Double_t deltaZ = 0.0;
273     if(pf->BestTrk()) {
274     deltaZ = TMath::Abs(pf->BestTrk()->DzCorrected(*vertex) - zLepton);
275     }
276    
277     // ignore the pf candidate if it is too far away in Z
278     if (deltaZ >= delta_z)
279     continue;
280    
281     Double_t dr = MathUtils::DeltaR(p->Mom(), pf->Mom());
282     // add the pf pt if it is inside the extRadius and outside the intRadius
283     if ( dr < extRadius &&
284     dr >= intRadius ) {
285    
286     //EtaStrip Veto for Gamma
287     if (pf->PFType() == PFCandidate::eGamma && fabs(p->Eta() - pf->Eta()) < 0.025) continue;
288    
289     //InnerCone (One Tower = dR < 0.07) Veto for non-gamma neutrals
290     if (!pf->HasTrk() && pf->PFType() == PFCandidate::eNeutralHadron
291     && MathUtils::DeltaR(p->Mom(), pf->Mom()) < 0.07 ) continue;
292    
293     ptSum += pf->Pt();
294    
295     }
296     }
297     return ptSum;
298     }
299    
300    
301     //--------------------------------------------------------------------------------------------------
302     Double_t IsolationTools::PFElectronIsolation(const Electron *p, const PFCandidateCol *PFCands,
303     const Vertex *vertex, const MuonCol *goodMuons,
304     const ElectronCol *goodElectrons,
305     Double_t delta_z, Double_t ptMin,
306 ceballos 1.8 Double_t extRadius, Double_t intRadius, int isoType,
307 sixie 1.16 Double_t beta)
308 ceballos 1.5 {
309     //Computes the PF Isolation: Summed Transverse Momentum of all PF candidates inside an
310     //annulus around the particle seed track.
311    
312     Double_t zLepton = 0.0;
313 ceballos 1.8 if(p->BestTrk()) zLepton = p->BestTrk()->DzCorrected(*vertex);
314 ceballos 1.5
315     Double_t ptSum =0.;
316     for (UInt_t i=0; i<PFCands->GetEntries();i++) {
317     const PFCandidate *pf = PFCands->At(i);
318    
319     Bool_t isGoodType = kFALSE;
320     // all particles
321 ceballos 1.6 if (isoType == 0) isGoodType = kTRUE;
322 ceballos 1.5 // charged particles only
323 ceballos 1.6 else if(isoType == 1 && pf->BestTrk()) isGoodType = kTRUE;
324 ceballos 1.5 // charged particles and gammas only
325 ceballos 1.6 else if(isoType == 2 &&
326     (pf->BestTrk() || pf->PFType() == PFCandidate::eGamma)) isGoodType = kTRUE;
327 ceballos 1.8 // all particles, rejecting good leptons
328     else if(isoType == 3) isGoodType = kTRUE;
329 ceballos 1.5
330     if(isGoodType == kFALSE) continue;
331    
332 sixie 1.14
333     // 0.1 pt cut applied to charged
334 ceballos 1.12 if( pf->BestTrk() && pf->Pt() <= 0.1) continue;
335    
336 sixie 1.14 // pt cut applied to neutrals
337     if(!pf->HasTrk() && pf->Pt() <= ptMin) continue;
338 ceballos 1.6
339 ceballos 1.5 if(pf->TrackerTrk() && p->TrackerTrk() &&
340     pf->TrackerTrk() == p->TrackerTrk()) continue;
341    
342     if(pf->GsfTrk() && p->GsfTrk() &&
343     pf->GsfTrk() == p->GsfTrk()) continue;
344    
345     Double_t deltaZ = 0.0;
346     if(pf->BestTrk()) {
347 ceballos 1.8 deltaZ = TMath::Abs(pf->BestTrk()->DzCorrected(*vertex) - zLepton);
348 ceballos 1.5 }
349    
350     // ignore the pf candidate if it is too far away in Z
351 ceballos 1.6 if (deltaZ >= delta_z)
352 ceballos 1.5 continue;
353    
354     Double_t dr = MathUtils::DeltaR(p->Mom(), pf->Mom());
355     // add the pf pt if it is inside the extRadius and outside the intRadius
356     if ( dr < extRadius &&
357     dr >= intRadius ) {
358 ceballos 1.8 Bool_t isLepton = kFALSE;
359     if(goodMuons && isoType == 3){
360     for (UInt_t nl=0; nl<goodMuons->GetEntries();nl++) {
361     const Muon *m = goodMuons->At(nl);
362     if(pf->TrackerTrk() && m->TrackerTrk() &&
363     pf->TrackerTrk() == m->TrackerTrk()) {
364     isLepton = kTRUE;
365     break;
366     }
367     }
368     }
369     if(goodElectrons && isLepton == kFALSE && isoType == 3){
370     for (UInt_t nl=0; nl<goodElectrons->GetEntries();nl++) {
371     const Electron *e = goodElectrons->At(nl);
372     if(pf->TrackerTrk() && e->TrackerTrk() &&
373     pf->TrackerTrk() == e->TrackerTrk()) {
374     isLepton = kTRUE;
375     break;
376     }
377     if(pf->GsfTrk() && e->GsfTrk() &&
378     pf->GsfTrk() == e->GsfTrk()) {
379     isLepton = kTRUE;
380     break;
381     }
382     }
383     }
384 sixie 1.14
385     if (isLepton == kTRUE) continue;
386    
387     //EtaStrip Veto for Gamma
388     if (pf->PFType() == PFCandidate::eGamma && fabs(p->Eta() - pf->Eta()) < 0.025) continue;
389    
390     //InnerCone (One Tower = dR < 0.07) Veto for non-gamma neutrals
391     if (!pf->HasTrk() && pf->PFType() == PFCandidate::eNeutralHadron
392     && MathUtils::DeltaR(p->Mom(), pf->Mom()) < 0.07 ) continue;
393    
394    
395     if(pf->BestTrk()) ptSum += pf->Pt();
396     else ptSum += pf->Pt()*beta;
397    
398    
399 ceballos 1.5 }
400     }
401     return ptSum;
402     }
403 ceballos 1.7 //--------------------------------------------------------------------------------------------------
404 ceballos 1.8 Double_t IsolationTools::BetaM(const TrackCol *tracks, const Muon *p, const Vertex *vertex,
405 ceballos 1.7 Double_t ptMin, Double_t delta_z, Double_t extRadius,
406     Double_t intRadius){
407    
408 ceballos 1.9 if(!tracks) return 1.0;
409 ceballos 1.7 if(tracks->GetEntries() <= 0) return 1.0;
410    
411     double Pt_jets_X = 0. ;
412     double Pt_jets_Y = 0. ;
413     double Pt_jets_X_tot = 0. ;
414     double Pt_jets_Y_tot = 0. ;
415    
416     for(int i=0;i<int(tracks->GetEntries());i++){
417     const Track *pTrack = tracks->At(i);
418    
419     if(pTrack && p->TrackerTrk() &&
420     pTrack == p->TrackerTrk()) continue;
421    
422     if(pTrack->Pt() <= ptMin) continue;
423    
424     Double_t dr = MathUtils::DeltaR(pTrack->Mom(),p->Mom());
425     if ( dr < extRadius && dr >= intRadius ) {
426     Pt_jets_X_tot += pTrack->Px();
427     Pt_jets_Y_tot += pTrack->Py();
428 ceballos 1.8 double pDz = TMath::Abs(pTrack->DzCorrected(*vertex));
429 ceballos 1.7 if(pDz < delta_z){
430     Pt_jets_X += pTrack->Px();
431     Pt_jets_Y += pTrack->Py();
432     }
433     }
434     }
435    
436     if(sqrt(Pt_jets_X_tot*Pt_jets_X_tot + Pt_jets_Y_tot*Pt_jets_Y_tot) > 0)
437     return sqrt(Pt_jets_X*Pt_jets_X + Pt_jets_Y*Pt_jets_Y) / sqrt(Pt_jets_X_tot*Pt_jets_X_tot + Pt_jets_Y_tot*Pt_jets_Y_tot);
438    
439     return 1.0;
440     }
441    
442     //--------------------------------------------------------------------------------------------------
443 ceballos 1.8 Double_t IsolationTools::BetaE(const TrackCol *tracks, const Electron *p, const Vertex *vertex,
444 ceballos 1.7 Double_t ptMin, Double_t delta_z, Double_t extRadius,
445     Double_t intRadius){
446    
447     if(!tracks) return 1.0;
448     if(tracks->GetEntries() <= 0) return 1.0;
449    
450     double Pt_jets_X = 0. ;
451     double Pt_jets_Y = 0. ;
452     double Pt_jets_X_tot = 0. ;
453     double Pt_jets_Y_tot = 0. ;
454    
455     for(int i=0;i<int(tracks->GetEntries());i++){
456     const Track *pTrack = tracks->At(i);
457    
458     if(pTrack && p->TrackerTrk() &&
459     pTrack == p->TrackerTrk()) continue;
460    
461     if(pTrack && p->GsfTrk() &&
462     pTrack == p->GsfTrk()) continue;
463    
464     if(pTrack->Pt() <= ptMin) continue;
465    
466     Double_t dr = MathUtils::DeltaR(pTrack->Mom(),p->Mom());
467     if ( dr < extRadius && dr >= intRadius ) {
468     Pt_jets_X_tot += pTrack->Px();
469     Pt_jets_Y_tot += pTrack->Py();
470 ceballos 1.8 double pDz = TMath::Abs(pTrack->DzCorrected(*vertex));
471 ceballos 1.7 if(pDz < delta_z){
472     Pt_jets_X += pTrack->Px();
473     Pt_jets_Y += pTrack->Py();
474     }
475     }
476     }
477    
478     if(sqrt(Pt_jets_X_tot*Pt_jets_X_tot + Pt_jets_Y_tot*Pt_jets_Y_tot) > 0)
479     return sqrt(Pt_jets_X*Pt_jets_X + Pt_jets_Y*Pt_jets_Y) / sqrt(Pt_jets_X_tot*Pt_jets_X_tot + Pt_jets_Y_tot*Pt_jets_Y_tot);
480    
481     return 1.0;
482     }
483 fabstoec 1.10
484    
485     // method added by F.Stoeckli: computes the track isolation with NO constrint on the OV-track compatibility
486     Double_t IsolationTools::TrackIsolationNoPV(const mithep::Particle* p, const BaseVertex* bsp,
487     Double_t extRadius,
488     Double_t intRadius,
489     Double_t ptLow,
490     Double_t etaStrip,
491     Double_t maxD0,
492     mithep::TrackQuality::EQuality quality,
493 bendavid 1.11 const mithep::Collection<mithep::Track> *tracks,
494     UInt_t maxNExpectedHitsInner,
495     const mithep::DecayParticleCol *conversions) {
496 fabstoec 1.10
497     // loop over all tracks
498     Double_t tPt = 0.;
499     for(UInt_t i=0; i<tracks->GetEntries(); ++i) {
500     const Track* t = tracks->At(i);
501     if ( t->Pt() < ptLow ) continue;
502     if ( ! t->Quality().Quality(quality) ) continue;
503     // only check for beamspot if available, otherwise ignore cut
504     if ( bsp && fabs(t->D0Corrected( *bsp) ) > maxD0) continue;
505 bendavid 1.11 if (t->NExpectedHitsInner()>maxNExpectedHitsInner) continue;
506     if (conversions && PhotonTools::MatchedConversion(t,conversions,bsp)) continue;
507 fabstoec 1.10 Double_t dR = MathUtils::DeltaR(t->Mom(),p->Mom());
508     Double_t dEta = fabs(t->Eta()-p->Eta());
509     if(dR < extRadius && dR > intRadius && dEta > etaStrip) tPt += t->Pt();
510     }
511     return tPt;
512     }
513