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2d4517ec | 1 | /************************************************************************* |
2 | * Copyright(c) 1998-2011, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | #include <TObjArray.h> | |
17 | #include <TClonesArray.h> | |
18 | #include <TGraph.h> | |
19 | #include <TFile.h> | |
20 | #include <TList.h> | |
21 | #include <TNtuple.h> | |
10371f90 | 22 | |
23 | #include "AliVertex.h" | |
24 | #include "AliVVertex.h" | |
25 | #include "AliESDVertex.h" | |
26 | #include "AliVertexerTracks.h" | |
27 | #include "AliAODEvent.h" | |
28 | #include "AliAODTrack.h" | |
29 | #include "AliAODMCParticle.h" | |
30 | #include "AliExternalTrackParam.h" | |
31 | #include "AliAODRecoDecayHF3Prong.h" | |
2d4517ec | 32 | #include "AliAnalysisTaskSEImproveITS.h" |
33 | ||
34 | // | |
35 | // Implementation of the "hybrid-approach" for ITS upgrade studies. | |
36 | // The tastk smears the track parameters according to estimations | |
37 | // from single-track upgrade studies. Afterwards it recalculates | |
38 | // the parameters of the reconstructed decays. | |
39 | // | |
40 | // WARNING: This will affect all tasks in a train after this one | |
41 | // (which is typically desired, though). | |
42 | // | |
43 | ||
44 | AliAnalysisTaskSEImproveITS::AliAnalysisTaskSEImproveITS() | |
45 | :AliAnalysisTaskSE(), | |
46 | fD0ZResPCur (0), | |
47 | fD0ZResKCur (0), | |
48 | fD0ZResPiCur (0), | |
49 | fD0RPResPCur (0), | |
50 | fD0RPResKCur (0), | |
51 | fD0RPResPiCur(0), | |
52 | fPt1ResPCur (0), | |
53 | fPt1ResKCur (0), | |
54 | fPt1ResPiCur (0), | |
55 | fD0ZResPUpg (0), | |
56 | fD0ZResKUpg (0), | |
57 | fD0ZResPiUpg (0), | |
58 | fD0RPResPUpg (0), | |
59 | fD0RPResKUpg (0), | |
60 | fD0RPResPiUpg(0), | |
61 | fPt1ResPUpg (0), | |
62 | fPt1ResKUpg (0), | |
63 | fPt1ResPiUpg (0), | |
64 | fDebugOutput (0), | |
65 | fDebugNtuple (0), | |
66 | fDebugVars (0), | |
67 | fNDebug (0) | |
68 | { | |
69 | // | |
70 | // Default constructor. | |
71 | // | |
72 | } | |
73 | ||
74 | AliAnalysisTaskSEImproveITS::AliAnalysisTaskSEImproveITS(const char *name, | |
75 | const char *resfileCurURI, | |
76 | const char *resfileUpgURI, | |
77 | Int_t ndebug) | |
78 | :AliAnalysisTaskSE(name), | |
79 | fD0ZResPCur (0), | |
80 | fD0ZResKCur (0), | |
81 | fD0ZResPiCur (0), | |
82 | fD0RPResPCur (0), | |
83 | fD0RPResKCur (0), | |
84 | fD0RPResPiCur(0), | |
85 | fPt1ResPCur (0), | |
86 | fPt1ResKCur (0), | |
87 | fPt1ResPiCur (0), | |
88 | fD0ZResPUpg (0), | |
89 | fD0ZResKUpg (0), | |
90 | fD0ZResPiUpg (0), | |
91 | fD0RPResPUpg (0), | |
92 | fD0RPResKUpg (0), | |
93 | fD0RPResPiUpg(0), | |
94 | fPt1ResPUpg (0), | |
95 | fPt1ResKUpg (0), | |
96 | fPt1ResPiUpg (0), | |
97 | fDebugOutput (0), | |
98 | fDebugNtuple (0), | |
99 | fDebugVars (0), | |
100 | fNDebug (ndebug) | |
101 | { | |
102 | // | |
103 | // Constructor to be used to create the task. | |
104 | // The the URIs specify the resolution files to be used. | |
105 | // They are expected to contain TGraphs with the resolutions | |
106 | // for the current and the upgraded ITS (see code for details). | |
107 | // One may also specify for how many tracks debug information | |
108 | // is written to the output. | |
109 | // | |
110 | TFile *resfileCur=TFile::Open(resfileCurURI); | |
111 | fD0RPResPCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("D0RPResP" ))); | |
112 | fD0RPResKCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("D0RPResK" ))); | |
113 | fD0RPResPiCur=new TGraph(*static_cast<TGraph*>(resfileCur->Get("D0RPResPi"))); | |
114 | fD0ZResPCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("D0ZResP" ))); | |
115 | fD0ZResKCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("D0ZResK" ))); | |
116 | fD0ZResPiCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("D0ZResPi" ))); | |
117 | fPt1ResPCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("Pt1ResP" ))); | |
118 | fPt1ResKCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("Pt1ResK" ))); | |
119 | fPt1ResPiCur =new TGraph(*static_cast<TGraph*>(resfileCur->Get("Pt1ResPi" ))); | |
120 | fD0RPResPCur ->SetName("D0RPResPCur" ); | |
121 | fD0RPResKCur ->SetName("D0RPResKCur" ); | |
122 | fD0RPResPiCur->SetName("D0RPResPiCur"); | |
123 | fD0ZResPCur ->SetName("D0ZResPCur" ); | |
124 | fD0ZResKCur ->SetName("D0ZResKCur" ); | |
125 | fD0ZResPiCur ->SetName("D0ZResPiCur" ); | |
126 | fPt1ResPCur ->SetName("Pt1ResPCur" ); | |
127 | fPt1ResKCur ->SetName("Pt1ResKCur" ); | |
128 | fPt1ResPiCur ->SetName("Pt1ResPiCur" ); | |
129 | delete resfileCur; | |
130 | TFile *resfileUpg=TFile::Open(resfileUpgURI ); | |
131 | fD0RPResPUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("D0RPResP" ))); | |
132 | fD0RPResKUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("D0RPResK" ))); | |
133 | fD0RPResPiUpg=new TGraph(*static_cast<TGraph*>(resfileUpg->Get("D0RPResPi"))); | |
134 | fD0ZResPUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("D0ZResP" ))); | |
135 | fD0ZResKUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("D0ZResK" ))); | |
136 | fD0ZResPiUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("D0ZResPi" ))); | |
137 | fPt1ResPUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("Pt1ResP" ))); | |
138 | fPt1ResKUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("Pt1ResK" ))); | |
139 | fPt1ResPiUpg =new TGraph(*static_cast<TGraph*>(resfileUpg->Get("Pt1ResPi" ))); | |
140 | fD0RPResPUpg ->SetName("D0RPResPUpg" ); | |
141 | fD0RPResKUpg ->SetName("D0RPResKUpg" ); | |
142 | fD0RPResPiUpg->SetName("D0RPResPiUpg"); | |
143 | fD0ZResPUpg ->SetName("D0ZResPUpg" ); | |
144 | fD0ZResKUpg ->SetName("D0ZResKUpg" ); | |
145 | fD0ZResPiUpg ->SetName("D0ZResPiUpg" ); | |
146 | fPt1ResPUpg ->SetName("Pt1ResPUpg" ); | |
147 | fPt1ResKUpg ->SetName("Pt1ResKUpg" ); | |
148 | fPt1ResPiUpg ->SetName("Pt1ResPiUpg" ); | |
149 | delete resfileUpg; | |
150 | ||
151 | DefineOutput(1,TNtuple::Class()); | |
152 | } | |
153 | ||
154 | AliAnalysisTaskSEImproveITS::~AliAnalysisTaskSEImproveITS() { | |
155 | // | |
156 | // Destructor. | |
157 | // | |
158 | delete fDebugOutput; | |
159 | } | |
160 | ||
161 | void AliAnalysisTaskSEImproveITS::UserCreateOutputObjects() { | |
162 | // | |
163 | // Creation of user output objects. | |
164 | // | |
165 | fDebugOutput=new TList(); | |
166 | fDebugOutput->SetOwner(); | |
167 | fDebugNtuple=new TNtuple("fDebugNtuple","Smearing","pdg:ptmc:d0rpo:d0zo:pt1o:sd0rpo:sd0zo:spt1o:d0rpn:d0zn:pt1n:sd0rpn:sd0zn:spt1n:d0rpmc:d0zmc:pt1mc"); | |
168 | fDebugVars=new Float_t[fDebugNtuple->GetNvar()]; | |
169 | ||
170 | fDebugOutput->Add(fDebugNtuple ); | |
171 | ||
172 | fDebugOutput->Add(fD0RPResPCur ); | |
173 | fDebugOutput->Add(fD0RPResKCur ); | |
174 | fDebugOutput->Add(fD0RPResPiCur); | |
175 | fDebugOutput->Add(fD0ZResPCur ); | |
176 | fDebugOutput->Add(fD0ZResKCur ); | |
177 | fDebugOutput->Add(fD0ZResPiCur ); | |
178 | fDebugOutput->Add(fPt1ResPCur ); | |
179 | fDebugOutput->Add(fPt1ResKCur ); | |
180 | fDebugOutput->Add(fPt1ResPiCur ); | |
181 | fDebugOutput->Add(fD0RPResPUpg ); | |
182 | fDebugOutput->Add(fD0RPResKUpg ); | |
183 | fDebugOutput->Add(fD0RPResPiUpg); | |
184 | fDebugOutput->Add(fD0ZResPUpg ); | |
185 | fDebugOutput->Add(fD0ZResKUpg ); | |
186 | fDebugOutput->Add(fD0ZResPiUpg ); | |
187 | fDebugOutput->Add(fPt1ResPUpg ); | |
188 | fDebugOutput->Add(fPt1ResKUpg ); | |
189 | fDebugOutput->Add(fPt1ResPiUpg ); | |
190 | ||
191 | PostData(1,fDebugOutput); | |
192 | } | |
193 | ||
194 | void AliAnalysisTaskSEImproveITS::UserExec(Option_t*) { | |
195 | // | |
196 | // The event loop | |
197 | // | |
198 | AliAODEvent *ev=dynamic_cast<AliAODEvent*>(InputEvent()); | |
a828d135 | 199 | if(!ev) return; |
2d4517ec | 200 | Double_t bz=ev->GetMagneticField(); |
201 | ||
202 | // Smear all tracks | |
203 | TClonesArray *mcs=static_cast<TClonesArray*>(ev->GetList()->FindObject(AliAODMCParticle::StdBranchName())); | |
204 | if (!mcs) return; | |
205 | for (Int_t itrack=0;itrack<ev->GetNumberOfTracks();++itrack) | |
206 | SmearTrack(ev->GetTrack(itrack),mcs); | |
207 | ||
208 | // TODO: recalculated primary vertex | |
209 | AliVVertex *primaryVertex=ev->GetPrimaryVertex(); | |
210 | ||
211 | // Recalculate all candidates | |
212 | TClonesArray *array3Prong=static_cast<TClonesArray*>(ev->GetList()->FindObject("Charm3Prong")); | |
213 | if (array3Prong) { | |
214 | for (Int_t icand=0;icand<array3Prong->GetEntries();++icand) { | |
215 | AliAODRecoDecayHF3Prong *decay=static_cast<AliAODRecoDecayHF3Prong*>(array3Prong->At(icand)); | |
216 | ||
217 | // recalculate vertices | |
218 | AliVVertex *oldSecondaryVertex=decay->GetSecondaryVtx(); | |
219 | AliExternalTrackParam et1(static_cast<AliAODTrack*>(decay->GetDaughter(0))); | |
220 | AliExternalTrackParam et2(static_cast<AliAODTrack*>(decay->GetDaughter(1))); | |
221 | AliExternalTrackParam et3(static_cast<AliAODTrack*>(decay->GetDaughter(2))); | |
222 | TObjArray ta123,ta12,ta23; | |
223 | ta123.Add(&et1);ta123.Add(&et2);ta123.Add(&et3); | |
224 | ta12. Add(&et1);ta12 .Add(&et2); | |
225 | ta23 .Add(&et2);ta23 .Add(&et3); | |
226 | AliESDVertex *v123=RecalculateVertex(oldSecondaryVertex,&ta123,bz); | |
227 | AliESDVertex *v12 =RecalculateVertex(oldSecondaryVertex,&ta12 ,bz); | |
228 | AliESDVertex *v23 =RecalculateVertex(oldSecondaryVertex,&ta23 ,bz); | |
229 | ||
230 | // update secondary vertex | |
231 | Double_t pos[3]; | |
232 | v123->GetXYZ(pos); | |
233 | decay->GetSecondaryVtx()->SetPosition(pos[0],pos[1],pos[2]); | |
234 | decay->GetSecondaryVtx()->SetChi2perNDF(v123->GetChi2toNDF()); | |
235 | //TODO: covariance matrix | |
236 | ||
237 | // update d0 for all progs | |
238 | Double_t d0z0[2],covd0z0[3]; | |
239 | Double_t d0[3],d0err[3]; | |
240 | et1.PropagateToDCA(primaryVertex,bz,100.,d0z0,covd0z0); | |
241 | d0[0]=d0z0[0]; | |
242 | d0err[0] = TMath::Sqrt(covd0z0[0]); | |
243 | et2.PropagateToDCA(primaryVertex,bz,100.,d0z0,covd0z0); | |
244 | d0[1]=d0z0[0]; | |
245 | d0err[1] = TMath::Sqrt(covd0z0[0]); | |
246 | et3.PropagateToDCA(primaryVertex,bz,100.,d0z0,covd0z0); | |
247 | d0[2]=d0z0[0]; | |
248 | d0err[2] = TMath::Sqrt(covd0z0[0]); | |
249 | decay->Setd0Prongs (3,d0 ); | |
250 | decay->Setd0errProngs(3,d0err); | |
251 | // TODO: setter missing | |
252 | ||
253 | // update dca for prong combinations | |
254 | Double_t xdummy=0.,ydummy=0.; | |
255 | Double_t dca[3]; | |
256 | dca[0]=et1.GetDCA(&et2,bz,xdummy,ydummy); | |
257 | dca[1]=et3.GetDCA(&et2,bz,xdummy,ydummy); | |
258 | dca[2]=et1.GetDCA(&et3,bz,xdummy,ydummy); | |
259 | decay->SetDCAs(3,dca); | |
260 | ||
261 | // update dist12 and dist23 | |
262 | primaryVertex->GetXYZ(pos); | |
263 | decay->SetDist12toPrim(TMath::Sqrt((v12->GetX()-pos[0])*(v12->GetX()-pos[0]) | |
264 | +(v12->GetY()-pos[1])*(v12->GetY()-pos[1]) | |
265 | +(v12->GetZ()-pos[2])*(v12->GetZ()-pos[2]))); | |
266 | decay->SetDist23toPrim(TMath::Sqrt((v23->GetX()-pos[0])*(v23->GetX()-pos[0]) | |
267 | +(v23->GetY()-pos[1])*(v23->GetY()-pos[1]) | |
268 | +(v23->GetZ()-pos[2])*(v23->GetZ()-pos[2]))); | |
269 | ||
270 | delete v123;delete v12;delete v23; | |
271 | ||
272 | Double_t px[3],py[3],pz[3]; | |
273 | for (Int_t i=0;i<3;++i) { | |
274 | const AliAODTrack *t=static_cast<AliAODTrack*>(decay->GetDaughter(i)); | |
275 | px[i]=t->Px(); | |
276 | py[i]=t->Py(); | |
277 | pz[i]=t->Pz(); | |
278 | } | |
279 | decay->SetPxPyPzProngs(3,px,py,pz); | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | void AliAnalysisTaskSEImproveITS::SmearTrack(AliAODTrack *track,const TClonesArray *mcs) { | |
285 | // Early exit, if this track has nothing in common with the ITS | |
286 | if (!(track->HasPointOnITSLayer(0) || track->HasPointOnITSLayer(1))) | |
287 | return; | |
288 | ||
289 | // Get reconstructed track parameters | |
290 | AliExternalTrackParam et(track); | |
291 | Double_t *param=const_cast<Double_t*>(et.GetParameter()); | |
292 | //TODO: Double_t *covar=const_cast<Double_t*>(et.GetCovariance()); | |
293 | ||
294 | // Get MC info | |
295 | Int_t imc=track->GetLabel(); | |
296 | if (imc<=0) return; | |
297 | const AliAODMCParticle *mc=static_cast<AliAODMCParticle*>(mcs->At(imc)); | |
298 | Double_t mcx[3]; | |
299 | Double_t mcp[3]; | |
300 | Double_t mccv[36]={0.}; | |
301 | Short_t mcc; | |
302 | mc->XvYvZv(mcx); | |
303 | mc->PxPyPz(mcp); | |
304 | mcc=mc->Charge(); | |
305 | AliExternalTrackParam mct(mcx,mcp,mccv,mcc); | |
306 | const Double_t *parammc=mct.GetParameter(); | |
307 | //TODO: const Double_t *covermc=mct.GetCovariance(); | |
308 | AliVertex vtx(mcx,1.,1); | |
309 | ||
310 | // Correct reference points and frames according to MC | |
311 | // TODO: B-Field correct? | |
312 | // TODO: failing propagation.... | |
313 | et.PropagateToDCA(&vtx,track->GetBz(),10.); | |
314 | et.Rotate(mct.GetAlpha()); | |
315 | ||
316 | // Select appropriate smearing functions | |
317 | Double_t ptmc=TMath::Abs(mc->Pt()); | |
318 | Double_t sd0rpn=0.; | |
319 | Double_t sd0zn =0.; | |
320 | Double_t spt1n =0.; | |
321 | Double_t sd0rpo=0.; | |
322 | Double_t sd0zo =0.; | |
323 | Double_t spt1o =0.; | |
324 | switch (mc->GetPdgCode()) { | |
325 | case 2212: case -2212: | |
326 | sd0rpo=EvalGraph(fD0RPResPCur,ptmc); | |
327 | sd0zo =EvalGraph(fD0ZResPCur ,ptmc); | |
328 | spt1o =EvalGraph(fPt1ResPCur ,ptmc); | |
329 | sd0rpn=EvalGraph(fD0RPResPUpg,ptmc); | |
330 | sd0zn =EvalGraph(fD0ZResPUpg ,ptmc); | |
331 | spt1n =EvalGraph(fPt1ResPUpg ,ptmc); | |
332 | break; | |
333 | case 321: case -321: | |
334 | sd0rpo=EvalGraph(fD0RPResKCur,ptmc); | |
335 | sd0zo =EvalGraph(fD0ZResKCur ,ptmc); | |
336 | spt1o =EvalGraph(fPt1ResKCur ,ptmc); | |
337 | sd0rpn=EvalGraph(fD0RPResKUpg,ptmc); | |
338 | sd0zn =EvalGraph(fD0ZResKUpg ,ptmc); | |
339 | spt1n =EvalGraph(fPt1ResKUpg ,ptmc); | |
340 | break; | |
341 | case 211: case -211: | |
342 | sd0rpo=EvalGraph(fD0RPResPiCur,ptmc); | |
343 | sd0zo =EvalGraph(fD0ZResPiCur ,ptmc); | |
344 | spt1o =EvalGraph(fPt1ResPiCur ,ptmc); | |
345 | sd0rpn=EvalGraph(fD0RPResPiUpg,ptmc); | |
346 | sd0zn =EvalGraph(fD0ZResPiUpg ,ptmc); | |
347 | spt1n =EvalGraph(fPt1ResPiUpg ,ptmc); | |
348 | break; | |
349 | default: | |
350 | return; | |
351 | } | |
352 | ||
353 | // Use the same units (i.e. cm and GeV/c)! TODO: pt! | |
354 | sd0rpo*=1.e-4; | |
355 | sd0zo *=1.e-4; | |
356 | sd0rpn*=1.e-4; | |
357 | sd0zn *=1.e-4; | |
358 | ||
359 | // Apply the smearing | |
360 | Double_t d0zo =param [1]; | |
361 | Double_t d0zmc =parammc[1]; | |
362 | Double_t d0rpo =param [0]; | |
363 | Double_t d0rpmc=parammc[0]; | |
364 | Double_t pt1o =param [4]; | |
365 | Double_t pt1mc =parammc[4]; | |
366 | Double_t dd0zo =d0zo-d0zmc; | |
367 | Double_t dd0zn =dd0zo *(sd0zo >0. ? (sd0zn /sd0zo ) : 1.); | |
368 | Double_t d0zn =d0zmc+dd0zn; | |
369 | Double_t dd0rpo=d0rpo-d0rpmc; | |
370 | Double_t dd0rpn=dd0rpo*(sd0rpo>0. ? (sd0rpn/sd0rpo) : 1.); | |
371 | Double_t d0rpn =d0rpmc+dd0rpn; | |
372 | Double_t dpt1o =pt1o-pt1mc; | |
373 | Double_t dpt1n =dpt1o *(spt1o >0. ? (spt1n /spt1o ) : 1.); | |
374 | Double_t pt1n =pt1mc+dpt1n; | |
375 | param[0]=d0rpn; | |
376 | param[1]=d0zn ; | |
377 | param[4]=pt1n ; | |
378 | ||
379 | // Copy the smeared parameters to the AOD track | |
380 | Double_t x[3]; | |
381 | Double_t p[3]; | |
382 | et.GetXYZ(x); | |
383 | et.GetPxPyPz(p); | |
384 | track->SetPosition(x,kFALSE); | |
385 | track->SetP(p,kTRUE); | |
386 | ||
387 | // write out debug infos | |
388 | if (fDebugNtuple->GetEntries()<fNDebug) { | |
389 | Int_t idbg=0; | |
390 | fDebugVars[idbg++]=mc->GetPdgCode(); | |
391 | fDebugVars[idbg++]=ptmc ; | |
392 | fDebugVars[idbg++]=d0rpo ; | |
393 | fDebugVars[idbg++]=d0zo ; | |
394 | fDebugVars[idbg++]=pt1o ; | |
395 | fDebugVars[idbg++]=sd0rpo; | |
396 | fDebugVars[idbg++]=sd0zo ; | |
397 | fDebugVars[idbg++]=spt1o ; | |
398 | fDebugVars[idbg++]=d0rpn ; | |
399 | fDebugVars[idbg++]=d0zn ; | |
400 | fDebugVars[idbg++]=pt1n ; | |
401 | fDebugVars[idbg++]=sd0rpn; | |
402 | fDebugVars[idbg++]=sd0zn ; | |
403 | fDebugVars[idbg++]=spt1n ; | |
404 | fDebugVars[idbg++]=d0rpmc; | |
405 | fDebugVars[idbg++]=d0zmc ; | |
406 | fDebugVars[idbg++]=pt1mc ; | |
407 | fDebugNtuple->Fill(fDebugVars); | |
408 | PostData(1,fDebugOutput); | |
409 | } | |
410 | } | |
411 | ||
412 | AliESDVertex* AliAnalysisTaskSEImproveITS::RecalculateVertex(const AliVVertex *old,TObjArray *tracks,Double_t bField) { | |
413 | // | |
414 | // Helper function to recalculate a vertex. | |
415 | // | |
416 | ||
417 | static UShort_t ids[]={1,2,3}; //TODO: unsave... | |
418 | AliVertexerTracks vertexer(bField); | |
419 | vertexer.SetVtxStart(old->GetX(),old->GetY(),old->GetZ()); | |
420 | AliESDVertex *vertex=vertexer.VertexForSelectedTracks(tracks,ids); | |
421 | return vertex; | |
422 | } | |
423 | ||
424 | Double_t AliAnalysisTaskSEImproveITS::EvalGraph(const TGraph *graph,Double_t x) const { | |
425 | // | |
426 | // Evaluates a TGraph without linear extrapolation. Instead the last | |
427 | // valid point of the graph is used when out of range. | |
428 | // The function assumes an ascending order of X. | |
429 | // | |
430 | ||
431 | // TODO: find a pretty solution for this: | |
432 | Int_t n =graph->GetN(); | |
433 | Double_t xmin=graph->GetX()[0 ]; | |
434 | Double_t xmax=graph->GetX()[n-1]; | |
435 | if (x<xmin) return graph->Eval(xmin); | |
436 | if (x>xmax) return graph->Eval(xmax); | |
437 | return graph->Eval(x); | |
438 | } | |
439 | ||
440 | ClassImp(AliAnalysisTaskSEImproveITS); | |
441 |