Minor fix
[u/mrichter/AliRoot.git] / HLT / global / AliHLTV0FinderComponent.cxx
CommitLineData
f078d002 1// $Id$
2
3//**************************************************************************
4//* This file is property of and copyright by the ALICE HLT Project *
5//* ALICE Experiment at CERN, All rights reserved. *
6//* *
7//* Primary Authors: Timur Pocheptsov <Timur.Pocheptsov@cern.ch> *
8//* for The ALICE HLT Project. *
9//* *
10//* Permission to use, copy, modify and distribute this software and its *
11//* documentation strictly for non-commercial purposes is hereby granted *
12//* without fee, provided that the above copyright notice appears in all *
13//* copies and that both the copyright notice and this permission notice *
14//* appear in the supporting documentation. The authors make no claims *
15//* about the suitability of this software for any purpose. It is *
16//* provided "as is" without express or implied warranty. *
17//**************************************************************************
18
19/// @file AliHLTV0FinderComponent.cxx
20/// @author Timur Pocheptsov
21/// @date 2010-12-26
22/// @brief V0 finder component
23///
24
25#include "TString.h"
26
27#include "AliHLTDataTypes.h"
28#include "AliHLTV0FinderComponent.h"
29
30ClassImp(AliHLTV0FinderComponent)
31
32const double AliHLTV0FinderComponent::fgDaughterPrimDeviation = 2.5;
33const double AliHLTV0FinderComponent::fgPrimDeviation = 3.5;
34const double AliHLTV0FinderComponent::fgChi = 3.5;
35const double AliHLTV0FinderComponent::fgDecayLengthInSigmas = 3.;
36
37//________________________________________________________________________
38AliHLTV0FinderComponent::AliHLTV0FinderComponent()
39 : fPrimaryVtx(),
40 fPrimaryTracks(),
41 fNPrimaryTracks(0),
42 fMinPrimID(0),
43 fMaxPrimID(0),
44 fDaughterPrimDeviation(fgDaughterPrimDeviation),
45 fPrimDeviation(fgPrimDeviation),
46 fChi(fgChi),
47 fDecayLengthInSigmas(fgDecayLengthInSigmas),
48 fPosPID(211),
49 fNegPID(211),
50 fV0s(),
51 fGammaFinder(false)
52{
53 //Default ctor.
54}
55
56//________________________________________________________________________
57const char* AliHLTV0FinderComponent::GetComponentID()
58{
59 //Component's "name".
60 return "V0Finder";
61}
62
63//________________________________________________________________________
64void AliHLTV0FinderComponent::GetInputDataTypes(AliHLTComponentDataTypeList& list)
65{
66 //Input to the primary vertex finder:
67 //a)tracks from ESD object;
68 //b)hlt tracks (ITS)
69 //c)hlt tracks (TPC)
70 //d)primary vertex (AliKFVertex)
71 //e)indices of primary tracks.
72 list.clear();
73 //Input tracks.
74 list.push_back(kAliHLTDataTypeESDObject);
75 list.push_back(kAliHLTDataTypeTrack | kAliHLTDataOriginITS);
76 list.push_back(kAliHLTDataTypeTrack | kAliHLTDataOriginTPC);
77 //Input from primary finder:
78 //Primary vertex.
79 list.push_back(kAliHLTDataTypeKFVertex | kAliHLTDataOriginOut);
80 //Primary tracks' indices.
81 list.push_back(kAliHLTDataTypePrimaryFinder | kAliHLTDataOriginOut);
82}
83
84//________________________________________________________________________
85AliHLTComponentDataType AliHLTV0FinderComponent::GetOutputDataType()
86{
87 //Data type of output.
88 return kAliHLTMultipleDataType;
89}
90
91//________________________________________________________________________
92int AliHLTV0FinderComponent::GetOutputDataTypes(AliHLTComponentDataTypeList& tgtList)
93{
94 //Output type for V0 finder.
95 tgtList.clear();
96 //Indices of tracks, participating in V0s.
97 tgtList.push_back(kAliHLTDataTypeV0Finder | kAliHLTDataOriginOut);
98
99 return tgtList.size();
100}
101
102//________________________________________________________________________
103void AliHLTV0FinderComponent::GetOutputDataSize(unsigned long& constBase, double& inputMultiplier)
104{
105 //These numbers are complete crap.
106 constBase = 80000;
107 inputMultiplier = 2.;
108}
109
110//________________________________________________________________________
111AliHLTComponent* AliHLTV0FinderComponent::Spawn()
112{
113 //Create primary vertex finder componet.
114 return new AliHLTV0FinderComponent;
115}
116
117//________________________________________________________________________
bf0b4a59 118int AliHLTV0FinderComponent::DoInit(int argc, const char** argv)
f078d002 119{
120 //1. Default parameters.
121 fDaughterPrimDeviation = fgDaughterPrimDeviation;
122 fPrimDeviation = fgPrimDeviation;
123 fChi = fgChi;
124 fDecayLengthInSigmas = fgDecayLengthInSigmas;
125 fPosPID = 211;
126 fNegPID = 211;
127 fGammaFinder = false;
128
f078d002 129 //2. Parameters from OCDB.
130 TString cdbPath("HLT/ConfigHLT/");
131 cdbPath += GetComponentID();
132
133 int res = ConfigureFromCDBTObjString(cdbPath);
134 if (res < 0)
135 return res;
136
137 //3. "Command line" parameters.
138 if (argc)
139 res = ConfigureFromArgumentString(argc, argv);
140
bf0b4a59 141 return res;
f078d002 142}
143
144//________________________________________________________________________
145int AliHLTV0FinderComponent::ScanConfigurationArgument(int argc, const char** argv)
146{
147 //Scan one argument and its parameters from the list
148 //Return number of processed entries.
149 //Possible arguments:
150 //-daughterPrimDeviation num
151 //-primDeviation num
152 //-chi num
153 //-decayLengthInSigmas num
154 //-posPID int_num
155 //-negPid int_num
156 //-gammaFinder 0/1
157
158 AliHLTUtility::CmdLineParser parser;
159 parser.Add("-daughterPrimDeviation", &fDaughterPrimDeviation);
160 parser.Add("-primDeviation", &fPrimDeviation);
161 parser.Add("-chi", &fChi);
162 parser.Add("-decayLengthInSigmas", &fDecayLengthInSigmas);
163 parser.Add("-posPID", &fPosPID);
164 parser.Add("-negPID", &fNegPID);
165 parser.Add("-gammaFinder", &fGammaFinder);
166
167 const int nParsed = parser.Parse(argc, argv, 0);
168 if (nParsed < 0) {
169 HLTError(parser.GetError().Data());
170 return -EPROTO;
171 }
172
173 return nParsed;
174}
175
176//________________________________________________________________________
177int AliHLTV0FinderComponent::DoDeinit()
178{
179 //Reset parameters to default.
180 fDaughterPrimDeviation = fgDaughterPrimDeviation;
181 fPrimDeviation = fgPrimDeviation;
182 fChi = fgChi;
183 fDecayLengthInSigmas = fgDecayLengthInSigmas;
184 fPosPID = 211;
185 fNegPID = 211;
186 fGammaFinder = false;
187
188 return 0;
189}
190
191//________________________________________________________________________
192int AliHLTV0FinderComponent::DoEvent(const AliHLTComponentEventData& /*evtData*/,
193 AliHLTComponentTriggerData& /*trigData*/)
194{
195 //Find primary vertex.
196 if (GetFirstInputBlock(kAliHLTDataTypeSOR) || GetFirstInputBlock(kAliHLTDataTypeEOR))
197 return 0;
198
199 //Clean all previous track infos.
200 fTrackInfos.clear();
201 fPrimaryTracks.clear();
202
203 //Initialize KF package.
204 AliKFParticle::SetField(GetBz());
205
206 if (!ReadPrimaryVertex())
207 return 0;
208
209 if (!ReadTracks())
210 return 0;
211
212 FindV0s();
213
214 return DoOutput();
215}
216
217//________________________________________________________________________
218bool AliHLTV0FinderComponent::ReadPrimaryVertex()
219{
220 //Primary finder produces primary vertex (AliKFVertex) and
221 //indices for primary tracks.
222 //1. Try to extract primary vertex.
223 const TObject* obj = GetFirstInputObject(kAliHLTDataTypeKFVertex | kAliHLTDataOriginOut);
224 const AliKFVertex* kfVtx = dynamic_cast<const AliKFVertex*>(obj);
225
226 if (!kfVtx) {
227 HLTError("V0 finder requires KF vertex (primary vertex) as input");
228 return false;
229 }
230
231 //2. Try to read primary track indices.
232 const AliHLTComponentBlockData* p = GetFirstInputBlock(kAliHLTDataTypePrimaryFinder
233 | kAliHLTDataOriginOut);
234 if (!p || !p->fSize || !p->fPtr) {
235 HLTError("Array of primary track indices expected");
236 return false;
237 }
238
239 //Data block from primary finder
240 const PrimaryFinderBlock* blk = static_cast<PrimaryFinderBlock*>(p->fPtr);
241 //Track ids must be positive integers.
242 if (blk->fMinPrimID < 0 || blk->fMaxPrimID < 0) {
243 HLTError("Got negative track ID from primary finder, internal HLT error");
244 return false;
245 }
246
247 //3. Got correct data, modify the component's state.
248 //KF vertex.
249 fPrimaryVtx = *kfVtx;
250 //Primary tracks.
251 fNPrimaryTracks = blk->fNPrimaryTracks;
252 fMinPrimID = blk->fMinPrimID;
253 fMaxPrimID = blk->fMaxPrimID;
254
255 fPrimaryTracks.assign(fMaxPrimID + 1, 0);
256 for (int i = 0; i < fNPrimaryTracks; ++i)
257 fPrimaryTracks[blk->fPrimTrackIds[i]] = 1;
258
259 return true;
260}
261
262//________________________________________________________________________
263bool AliHLTV0FinderComponent::ReadTracks()
264{
265 //The logic, how vertex finder reads input tracks,
266 //is taken from the original global vertexer.
267 //First, try to read tracks from ESD event.
bf0b4a59 268 ReadESDTracks(fPosPID, fNegPID);
f078d002 269 if (fTrackInfos.size()) {
270 FindPrimaryDeviations();
271 return true;
272 }
273
274 //No good esd tracks, try:
bf0b4a59 275 ReadHLTTracks(kAliHLTDataTypeTrack | kAliHLTDataOriginITS, fPosPID, fNegPID);
f078d002 276 if (fTrackInfos.size()) {
277 FindPrimaryDeviations();
278 return true;
279 }
280
281 //If no good its tracks, try:
bf0b4a59 282 ReadHLTTracks(kAliHLTDataTypeTrack | kAliHLTDataOriginTPC, fPosPID, fNegPID);
f078d002 283 if (fTrackInfos.size()) {
284 FindPrimaryDeviations();
285 return true;
286 }
287
288 HLTError("No input tracks found for V0 finder");
289
290 return false;
291}
292
293//________________________________________________________________________
294void AliHLTV0FinderComponent::FindPrimaryDeviations()
295{
296 //Quite a tricky part.
297 for (VectorSize_t i = 0; i < fTrackInfos.size(); ++i) {
298 AliHLTTrackInfo& info = fTrackInfos[i];
299 if (IsPrimaryTrack(info.fID)) {
300 info.fPrimUsed = true;
301 //The way primary deviation is computed in primary finder:
302 if (fNPrimaryTracks <= 20) {
303 AliKFVertex tmp(fPrimaryVtx - info.fParticle);
304 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(tmp);
305 } else
306 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(fPrimaryVtx);
307 } else {
308 info.fPrimUsed = false;
309 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(fPrimaryVtx);
310 }
311 }
312}
313
314//________________________________________________________________________
315bool AliHLTV0FinderComponent::IsPrimaryTrack(int id)const
316{
317 if (id < fMinPrimID || id > fMaxPrimID)
318 return false;
319
320 return fPrimaryTracks[id];
321}
322
323//________________________________________________________________________
324void AliHLTV0FinderComponent::FindV0s()
325{
326 //Here's the core.
327 if (fPrimaryVtx.GetNContributors() < 3)
328 return;
329
330 fV0s.clear();
331 fV0s.push_back(0); //Number of v0s.
332
333 for (int iTr = 0, ei = fTrackInfos.size(); iTr < ei; ++iTr) {
334 AliHLTTrackInfo& info = fTrackInfos[iTr];
335 if (info.fParticle.GetQ() > 0)
336 continue;
337 if (info.fPrimDeviation < fDaughterPrimDeviation)
338 continue;
339
340 for (int jTr = 0; jTr < ei; ++jTr) {
341 AliHLTTrackInfo& jnfo = fTrackInfos[jTr];
342 if (jnfo.fParticle.GetQ() < 0)
343 continue;
344 if (jnfo.fPrimDeviation < fDaughterPrimDeviation)
345 continue;
346
347 //Check if the particles fit
348 if (info.fParticle.GetDeviationFromParticle(jnfo.fParticle) > fChi)
349 continue;
350
351 //Construct V0 mother
352 AliKFParticle v0(info.fParticle, jnfo.fParticle /*, bGammaFinder*/);
353 //Check V0 Chi^2
354 if (v0.GetChi2() < 0. || v0.GetChi2() > fChi * fChi * v0.GetNDF())
355 continue;
356
357 //Subtruct daughters from primary vertex
358 AliKFVertex primVtxCopy(fPrimaryVtx);
359
360 if (info.fPrimUsed) {
361 if (primVtxCopy.GetNContributors() <= 2)
362 continue;
363 primVtxCopy -= info.fParticle;
364 }
365
366 if (jnfo.fPrimUsed) {
367 if (primVtxCopy.GetNContributors() <= 2)
368 continue;
369 primVtxCopy -= jnfo.fParticle;
370 }
371
372 //Check v0 Chi^2 deviation from primary vertex
373 if (v0.GetDeviationFromVertex(primVtxCopy) > fPrimDeviation)
374 continue;
375 //Add V0 to primary vertex to improve the primary vertex resolution
376 primVtxCopy += v0;
377 //Set production vertex for V0
378 v0.SetProductionVertex(primVtxCopy);
379 //Get V0 decay length with estimated error
380 double length = 0., sigmaLength = 0.;
381 if (v0.GetDecayLength(length, sigmaLength))
382 continue;
383 //Reject V0 if it decays too close[sigma] to the primary vertex
384 if (length < fDecayLengthInSigmas * sigmaLength)
385 continue;
386 //Keep v0
130ddc9e 387 fV0s.push_back(info.fID);
388 fV0s.push_back(jnfo.fID);
f078d002 389
390 fV0s[0] += 1;
391 }
392 }
393}
394
395//________________________________________________________________________
396int AliHLTV0FinderComponent::DoOutput()
397{
398 //Save V0s' track pairs' indices.
399 if (!fV0s.size() || !fV0s[0]) {
400 HLTInfo("No v0s were found");
401 return 0;
402 }
403
404 //Indices of primary tracks.
405 return PushBack(&fV0s[0], fV0s.size() * sizeof(int),
406 kAliHLTDataTypeV0Finder | kAliHLTDataOriginOut);
407}