3 //**************************************************************************
4 //* This file is property of and copyright by the ALICE HLT Project *
5 //* ALICE Experiment at CERN, All rights reserved. *
7 //* Primary Authors: Timur Pocheptsov <Timur.Pocheptsov@cern.ch> *
8 //* for The ALICE HLT Project. *
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 //**************************************************************************
19 /// @file AliHLTV0FinderComponent.cxx
20 /// @author Timur Pocheptsov
22 /// @brief V0 finder component
27 #include "AliHLTDataTypes.h"
28 #include "AliHLTV0FinderComponent.h"
30 ClassImp(AliHLTV0FinderComponent)
32 const double AliHLTV0FinderComponent::fgDaughterPrimDeviation = 2.5;
33 const double AliHLTV0FinderComponent::fgPrimDeviation = 3.5;
34 const double AliHLTV0FinderComponent::fgChi = 3.5;
35 const double AliHLTV0FinderComponent::fgDecayLengthInSigmas = 3.;
37 //________________________________________________________________________
38 AliHLTV0FinderComponent::AliHLTV0FinderComponent()
44 fDaughterPrimDeviation(fgDaughterPrimDeviation),
45 fPrimDeviation(fgPrimDeviation),
47 fDecayLengthInSigmas(fgDecayLengthInSigmas),
56 //________________________________________________________________________
57 const char* AliHLTV0FinderComponent::GetComponentID()
63 //________________________________________________________________________
64 void AliHLTV0FinderComponent::GetInputDataTypes(AliHLTComponentDataTypeList& list)
66 //Input to the primary vertex finder:
67 //a)tracks from ESD object;
70 //d)primary vertex (AliKFVertex)
71 //e)indices of primary tracks.
74 list.push_back(kAliHLTDataTypeESDObject);
75 list.push_back(kAliHLTDataTypeTrack | kAliHLTDataOriginITS);
76 list.push_back(kAliHLTDataTypeTrack | kAliHLTDataOriginTPC);
77 //Input from primary finder:
79 list.push_back(kAliHLTDataTypeKFVertex | kAliHLTDataOriginOut);
80 //Primary tracks' indices.
81 list.push_back(kAliHLTDataTypePrimaryFinder | kAliHLTDataOriginOut);
84 //________________________________________________________________________
85 AliHLTComponentDataType AliHLTV0FinderComponent::GetOutputDataType()
87 //Data type of output.
88 return kAliHLTMultipleDataType;
91 //________________________________________________________________________
92 int AliHLTV0FinderComponent::GetOutputDataTypes(AliHLTComponentDataTypeList& tgtList)
94 //Output type for V0 finder.
96 //Indices of tracks, participating in V0s.
97 tgtList.push_back(kAliHLTDataTypeV0Finder | kAliHLTDataOriginOut);
99 return tgtList.size();
102 //________________________________________________________________________
103 void AliHLTV0FinderComponent::GetOutputDataSize(unsigned long& constBase, double& inputMultiplier)
105 //These numbers are complete crap.
107 inputMultiplier = 2.;
110 //________________________________________________________________________
111 AliHLTComponent* AliHLTV0FinderComponent::Spawn()
113 //Create primary vertex finder componet.
114 return new AliHLTV0FinderComponent;
117 //________________________________________________________________________
118 int AliHLTV0FinderComponent::DoInit(int argc, const char** argv)
120 //1. Default parameters.
121 fDaughterPrimDeviation = fgDaughterPrimDeviation;
122 fPrimDeviation = fgPrimDeviation;
124 fDecayLengthInSigmas = fgDecayLengthInSigmas;
127 fGammaFinder = false;
129 //2. Parameters from OCDB.
130 TString cdbPath("HLT/ConfigHLT/");
131 cdbPath += GetComponentID();
133 int res = ConfigureFromCDBTObjString(cdbPath);
137 //3. "Command line" parameters.
139 res = ConfigureFromArgumentString(argc, argv);
142 fV0s.push_back(0); //Number of v0s.
147 //________________________________________________________________________
148 int AliHLTV0FinderComponent::ScanConfigurationArgument(int argc, const char** argv)
150 //Scan one argument and its parameters from the list
151 //Return number of processed entries.
152 //Possible arguments:
153 //-daughterPrimDeviation num
156 //-decayLengthInSigmas num
161 AliHLTUtility::CmdLineParser parser;
162 parser.Add("-daughterPrimDeviation", &fDaughterPrimDeviation);
163 parser.Add("-primDeviation", &fPrimDeviation);
164 parser.Add("-chi", &fChi);
165 parser.Add("-decayLengthInSigmas", &fDecayLengthInSigmas);
166 parser.Add("-posPID", &fPosPID);
167 parser.Add("-negPID", &fNegPID);
168 parser.Add("-gammaFinder", &fGammaFinder);
170 const int nParsed = parser.Parse(argc, argv, 0);
172 HLTError(parser.GetError().Data());
179 //________________________________________________________________________
180 int AliHLTV0FinderComponent::DoDeinit()
182 //Reset parameters to default.
183 fDaughterPrimDeviation = fgDaughterPrimDeviation;
184 fPrimDeviation = fgPrimDeviation;
186 fDecayLengthInSigmas = fgDecayLengthInSigmas;
189 fGammaFinder = false;
194 //________________________________________________________________________
195 int AliHLTV0FinderComponent::DoEvent(const AliHLTComponentEventData& /*evtData*/,
196 AliHLTComponentTriggerData& /*trigData*/)
198 //Find primary vertex.
199 if (GetFirstInputBlock(kAliHLTDataTypeSOR) || GetFirstInputBlock(kAliHLTDataTypeEOR))
202 //Clean all previous track infos.
204 fPrimaryTracks.clear();
206 //Initialize KF package.
207 AliKFParticle::SetField(GetBz());
209 // no output if there is no vertex information
210 if (!ReadPrimaryVertex())
213 // start from clean array
214 // the output block contains at least the number of pairs even
217 fV0s.push_back(0); //Number of v0s.
226 //________________________________________________________________________
227 bool AliHLTV0FinderComponent::ReadPrimaryVertex()
229 //Primary finder produces primary vertex (AliKFVertex) and
230 //indices for primary tracks.
231 //1. Try to extract primary vertex.
232 const TObject* obj = GetFirstInputObject(kAliHLTDataTypeKFVertex | kAliHLTDataOriginOut);
233 const AliKFVertex* kfVtx = dynamic_cast<const AliKFVertex*>(obj);
236 HLTError("V0 finder requires KF vertex (primary vertex) as input");
240 //2. Try to read primary track indices.
241 const AliHLTComponentBlockData* p = GetFirstInputBlock(kAliHLTDataTypePrimaryFinder
242 | kAliHLTDataOriginOut);
243 if (!p || !p->fSize || !p->fPtr) {
244 HLTError("Array of primary track indices expected");
248 //Data block from primary finder
249 const PrimaryFinderBlock* blk = static_cast<PrimaryFinderBlock*>(p->fPtr);
250 //Track ids must be positive integers.
251 if (blk->fMinPrimID < 0 || blk->fMaxPrimID < 0) {
252 HLTError("Got negative track ID from primary finder, internal HLT error");
256 //3. Got correct data, modify the component's state.
258 fPrimaryVtx = *kfVtx;
260 fNPrimaryTracks = blk->fNPrimaryTracks;
261 fMinPrimID = blk->fMinPrimID;
262 fMaxPrimID = blk->fMaxPrimID;
264 fPrimaryTracks.assign(fMaxPrimID + 1, 0);
265 for (int i = 0; i < fNPrimaryTracks; ++i)
266 fPrimaryTracks[blk->fPrimTrackIds[i]] = 1;
271 //________________________________________________________________________
272 bool AliHLTV0FinderComponent::ReadTracks()
274 //The logic, how vertex finder reads input tracks,
275 //is taken from the original global vertexer.
276 //First, try to read tracks from ESD event.
277 ReadESDTracks(fPosPID, fNegPID);
278 if (fTrackInfos.size()) {
279 FindPrimaryDeviations();
283 //No good esd tracks, try:
284 ReadHLTTracks(kAliHLTDataTypeTrack | kAliHLTDataOriginITS, fPosPID, fNegPID);
285 if (fTrackInfos.size()) {
286 FindPrimaryDeviations();
290 //If no good its tracks, try:
291 ReadHLTTracks(kAliHLTDataTypeTrack | kAliHLTDataOriginTPC, fPosPID, fNegPID);
292 if (fTrackInfos.size()) {
293 FindPrimaryDeviations();
297 HLTError("No input tracks found for V0 finder");
302 //________________________________________________________________________
303 void AliHLTV0FinderComponent::FindPrimaryDeviations()
305 //Quite a tricky part.
306 for (VectorSize_t i = 0; i < fTrackInfos.size(); ++i) {
307 AliHLTTrackInfo& info = fTrackInfos[i];
308 if (IsPrimaryTrack(info.fID)) {
309 info.fPrimUsed = true;
310 //The way primary deviation is computed in primary finder:
311 if (fNPrimaryTracks <= 20) {
312 AliKFVertex tmp(fPrimaryVtx - info.fParticle);
313 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(tmp);
315 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(fPrimaryVtx);
317 info.fPrimUsed = false;
318 info.fPrimDeviation = info.fParticle.GetDeviationFromVertex(fPrimaryVtx);
323 //________________________________________________________________________
324 bool AliHLTV0FinderComponent::IsPrimaryTrack(int id)const
326 if (id < fMinPrimID || id > fMaxPrimID)
329 return fPrimaryTracks[id];
332 //________________________________________________________________________
333 void AliHLTV0FinderComponent::FindV0s()
336 if (fPrimaryVtx.GetNContributors() < 3)
339 for (int iTr = 0, ei = fTrackInfos.size(); iTr < ei; ++iTr) {
340 AliHLTTrackInfo& info = fTrackInfos[iTr];
341 if (info.fParticle.GetQ() > 0)
343 if (info.fPrimDeviation < fDaughterPrimDeviation)
346 for (int jTr = 0; jTr < ei; ++jTr) {
347 AliHLTTrackInfo& jnfo = fTrackInfos[jTr];
348 if (jnfo.fParticle.GetQ() < 0)
350 if (jnfo.fPrimDeviation < fDaughterPrimDeviation)
353 //Check if the particles fit
354 if (info.fParticle.GetDeviationFromParticle(jnfo.fParticle) > fChi)
357 //Construct V0 mother
358 AliKFParticle v0(info.fParticle, jnfo.fParticle /*, bGammaFinder*/);
360 if (v0.GetChi2() < 0. || v0.GetChi2() > fChi * fChi * v0.GetNDF())
363 //Subtruct daughters from primary vertex
364 AliKFVertex primVtxCopy(fPrimaryVtx);
366 if (info.fPrimUsed) {
367 if (primVtxCopy.GetNContributors() <= 2)
369 primVtxCopy -= info.fParticle;
372 if (jnfo.fPrimUsed) {
373 if (primVtxCopy.GetNContributors() <= 2)
375 primVtxCopy -= jnfo.fParticle;
378 //Check v0 Chi^2 deviation from primary vertex
379 if (v0.GetDeviationFromVertex(primVtxCopy) > fPrimDeviation)
381 //Add V0 to primary vertex to improve the primary vertex resolution
383 //Set production vertex for V0
384 v0.SetProductionVertex(primVtxCopy);
385 //Get V0 decay length with estimated error
386 double length = 0., sigmaLength = 0.;
387 if (v0.GetDecayLength(length, sigmaLength))
389 //Reject V0 if it decays too close[sigma] to the primary vertex
390 if (length < fDecayLengthInSigmas * sigmaLength)
393 fV0s.push_back(info.fID);
394 fV0s.push_back(jnfo.fID);
401 //________________________________________________________________________
402 int AliHLTV0FinderComponent::DoOutput()
404 //Save V0s' track pairs' indices.
406 HLTError("internal data mismatch of output structure");
410 HLTInfo("Number of v0 candidates: %d", fV0s[0]);
412 //Indices of primary tracks.
413 return PushBack(&fV0s[0], fV0s.size() * sizeof(int),
414 kAliHLTDataTypeV0Finder | kAliHLTDataOriginOut);