1 //Created by Christine Nattrass, Rebecca Scott, Irakli Martashvili
2 //University of Tennessee at Knoxville
4 // This class is designed for the analysis of the hadronic component of
5 // transverse energy. It is used by AliAnalysisTaskHadEt.
6 // This gets information about the hadronic component of the transverse energy
7 // from tracks reconstructed in an event
8 // it has daughters, AliAnalysisEtCommonMonteCarlo and
9 // AliAnalysisEtCommonReconstructed which loop over either Monte Carlo data or
10 // real data to get Et
12 #include "AliAnalysisEtCommon.h"
19 #include "AliAnalysisEtCuts.h"
20 #include "AliMCEvent.h"
21 #include "AliVEvent.h"
23 #include "AliESDtrackCuts.h"
24 #include "TDatabasePDG.h"
25 #include "TParticle.h"
31 ClassImp(AliAnalysisEtCommon);
32 //These are from the PDG database but by making them static the code is a bit more efficient and has no problems running with the plugin
33 //Cuts are defined in $ROOTSYS/etc/pdg_table.txt
35 Float_t AliAnalysisEtCommon::fgPionMass = 0.13957;
36 Float_t AliAnalysisEtCommon::fgKaonMass = 0.493677;
37 Float_t AliAnalysisEtCommon::fgProtonMass = 0.938272;
38 Float_t AliAnalysisEtCommon::fgElectronMass = 0.000510999;
39 Int_t AliAnalysisEtCommon::fgPiPlusCode = 211;
40 Int_t AliAnalysisEtCommon::fgPiMinusCode = -211;
41 Int_t AliAnalysisEtCommon::fgKPlusCode = 321;
42 Int_t AliAnalysisEtCommon::fgKMinusCode = -321;
43 Int_t AliAnalysisEtCommon::fgProtonCode = 2212;
44 Int_t AliAnalysisEtCommon::fgAntiProtonCode = -2212;
45 Int_t AliAnalysisEtCommon::fgLambdaCode = 3122;
46 Int_t AliAnalysisEtCommon::fgAntiLambdaCode = -3122;
47 Int_t AliAnalysisEtCommon::fgK0Code = 311;
48 Int_t AliAnalysisEtCommon::fgK0SCode = 310;
49 Int_t AliAnalysisEtCommon::fgOmegaCode = 3334;
50 Int_t AliAnalysisEtCommon::fgAntiOmegaCode = -3334;
51 Int_t AliAnalysisEtCommon::fgXi0Code = 3322;
52 Int_t AliAnalysisEtCommon::fgAntiXi0Code = -3322;
53 Int_t AliAnalysisEtCommon::fgXiCode = 3312;
54 Int_t AliAnalysisEtCommon::fgAntiXiCode = -3312;
55 Int_t AliAnalysisEtCommon::fgSigmaCode = 3112;
56 Int_t AliAnalysisEtCommon::fgAntiSigmaCode = -3112;
57 Int_t AliAnalysisEtCommon::fgK0LCode = 130;
58 Int_t AliAnalysisEtCommon::fgNeutronCode = 2112;
59 Int_t AliAnalysisEtCommon::fgAntiNeutronCode = -2112;
60 Int_t AliAnalysisEtCommon::fgEPlusCode = -11;
61 Int_t AliAnalysisEtCommon::fgEMinusCode = 11;
62 Int_t AliAnalysisEtCommon::fgMuPlusCode = -13;
63 Int_t AliAnalysisEtCommon::fgMuMinusCode = 13;
64 Int_t AliAnalysisEtCommon::fgGammaCode = 22;
65 Int_t AliAnalysisEtCommon::fgPi0Code = 111;
66 Int_t AliAnalysisEtCommon::fgEtaCode = 221;
67 Int_t AliAnalysisEtCommon::fgOmega0Code = 223;
71 Float_t AliAnalysisEtCommon::fgPtTPCCutOff = 0.15;
72 Float_t AliAnalysisEtCommon::fgPtITSCutOff = 0.10;
74 AliAnalysisEtCommon::AliAnalysisEtCommon() : TObject()
75 ,fHistogramNameSuffix("")
78 ,fV0ScaleDataSet(2010)
79 ,fEsdtrackCutsITSTPC(0)
84 ,fAntiLambdaPythiaD6T(0)
88 ,fLambdaEnhancement(0)
89 ,fProtonEnhancement(0)
90 ,fCentralityMethod("V0M")
93 {//default constructor
97 AliAnalysisEtCommon::~AliAnalysisEtCommon()
100 delete fEsdtrackCutsITSTPC;
101 delete fEsdtrackCutsITS;
102 delete fEsdtrackCutsTPC;
104 delete fLambdaPythiaD6T;
105 delete fAntiLambdaPythiaD6T;
108 delete fAntiLambdaData;
109 delete fLambdaEnhancement;
110 delete fProtonEnhancement;
113 Int_t AliAnalysisEtCommon::AnalyseEvent(AliVEvent */*event*/)
114 { //this line is basically here to eliminate a compiler warning that event is not used. Making it a virtual function did not work with the plugin.
115 // cout << "This event has " << event->GetNumberOfTracks() << " tracks" << endl;
121 void AliAnalysisEtCommon::Init()
122 {// clear variables, set up cuts and PDG info
123 // LevyPt function described in LevyFitEvaluate below
126 //parameter 2 = power
127 if(fK0PythiaD6T) delete fK0PythiaD6T;
128 if(fLambdaPythiaD6T) delete fLambdaPythiaD6T;
129 if(fAntiLambdaPythiaD6T) delete fAntiLambdaPythiaD6T;
130 if(fK0Data) delete fK0Data;
131 if(fLambdaData) delete fLambdaData;
132 if(fAntiLambdaData) delete fAntiLambdaData;
134 fK0PythiaD6T = new TF1("K0PythiaD6T", LevyPtEvaluate, 0,50,4);
135 fLambdaPythiaD6T = new TF1("LambdaPythiaD6T", LevyPtEvaluate,0,50,4);
136 fAntiLambdaPythiaD6T = new TF1("AntiLambdaPythiaD6T", LevyPtEvaluate,0,50,4);
137 fK0Data = new TF1("K0Data", LevyPtEvaluate,0,50,4);
138 fLambdaData = new TF1("LambdaData", LevyPtEvaluate,0,50,4);
139 fAntiLambdaData = new TF1("AntiLambdaData", LevyPtEvaluate,0,50,4);
141 fK0PythiaD6T->FixParameter(3,0.493677);
142 fK0Data->FixParameter(3,0.493677);
143 fLambdaPythiaD6T->FixParameter(3,1.115683);
144 fAntiLambdaPythiaD6T->FixParameter(3,1.115683);
145 fLambdaData->FixParameter(3,1.115683);
146 fAntiLambdaData->FixParameter(3,1.115683);
147 if(fV0ScaleDataSet==2009){
148 //These data are from the ALICE 900 GeV p+p paper
149 //from email from Boris 10/31/10
150 // dN/dy Tlevy n <pt> extra(%) chi2/ndf
152 // D6T-109 0.1437±0.0002 0.1497±0.0004 6.94±0.04 0.5765 14.24 162.5/24=6.8
153 // CSC-306 0.1938±0.0002 0.1363±0.0003 8.84±0.06 0.4950 16.80 1075.1/24=44.8
154 // P0-320 0.1395±0.0002 0.1440±0.0004 6.43±0.04 0.5778 14.56 387.0/24=16.1
155 // PHOJET 0.1967±0.0002 0.1292±0.0003 7.01±0.04 0.5115 16.90 1735.4/24=72.3
158 // D6T-109 0.0213±0.0001 0.1315±0.0011 4.60±0.05 0.7889 48.25 200.1/26=7.7
159 // CSC-306 0.0279±0.0001 0.1074±0.0007 5.71±0.07 0.6131 59.25 71.8/26=2.8
160 // P0-320 0.0161±0.0001 0.1125±0.0010 4.53±0.05 0.7126 53.61 171.1/26=6.6
161 // PHOJET 0.0190±0.0001 0.1013±0.0008 4.70±0.05 0.6469 58.14 162.2/26=6.2
162 //paper available at http://arxiv.org/pdf/1012.3257v2
163 //so that if I'm working at home and don't have library access I can read the paper...
164 //While all of these functions are labeled D6T, they are actually Perugia-0. I did this to avoid the complication of renaming all of the variables.
165 fK0PythiaD6T->SetParameter(0,0.1395);
166 fK0PythiaD6T->SetParameter(1,0.1440);
167 fK0PythiaD6T->SetParameter(2,6.43);
168 fLambdaPythiaD6T->SetParameter(0,0.0161);
169 fLambdaPythiaD6T->SetParameter(1,0.1125);
170 fLambdaPythiaD6T->SetParameter(2,4.53);
171 fAntiLambdaPythiaD6T->SetParameter(0,0.0161);
172 fAntiLambdaPythiaD6T->SetParameter(1,0.1125);
173 fAntiLambdaPythiaD6T->SetParameter(2,4.53);
174 fK0Data->SetParameter(0,0.184);
175 fK0Data->SetParameter(1,0.168);
176 fK0Data->SetParameter(2,6.6);
177 fLambdaData->SetParameter(0,0.048);
178 fLambdaData->SetParameter(1,0.229);
179 fLambdaData->SetParameter(2,10.8);
180 fAntiLambdaData->SetParameter(0,0.047);
181 fAntiLambdaData->SetParameter(1,0.210);
182 fAntiLambdaData->SetParameter(2,9.2);
184 if(fV0ScaleDataSet==2010 ||fV0ScaleDataSet==20100 ||fV0ScaleDataSet==20111){
185 //These data are from the CMS analysis note on 7 TeV spectra
186 //http://cdsweb.cern.ch/record/1279344/files/QCD-10-007-pas.pdf
187 //Note the CMS parameterization of the Levy function differs from the ALICE parameterization by a constant.
188 //CMS does not list the overall constant in their fit, the ratios of the dN/dy(y=0) is used.
189 //While all of these functions are labeled D6T, they are actually Perugia-0. I did this to avoid the complication of renaming all of the variables.
190 fK0PythiaD6T->SetParameter(0,0.72);//K0S in CMS analysis note Fig. 10 - Perugia 0 and D6T level comparable
191 fK0PythiaD6T->SetParameter(1,0.168);
192 fK0PythiaD6T->SetParameter(2,5.39);
193 fLambdaPythiaD6T->SetParameter(0,0.54/1.12);//from looking at the difference in lambdas in Perugia 0 and D6T in fig. 10
194 fLambdaPythiaD6T->SetParameter(1,0.163);
195 fLambdaPythiaD6T->SetParameter(2,4.64);
196 fAntiLambdaPythiaD6T->SetParameter(0,0.54/1.12);//
197 fAntiLambdaPythiaD6T->SetParameter(1,0.163);
198 fAntiLambdaPythiaD6T->SetParameter(2,4.64);
199 // fK0PythiaD6T->SetParameter(0,0.72);
200 // fK0PythiaD6T->SetParameter(1,0.183);
201 // fK0PythiaD6T->SetParameter(2,5.71);
202 // fLambdaPythiaD6T->SetParameter(0,0.54);
203 // fLambdaPythiaD6T->SetParameter(1,0.216);
204 // fLambdaPythiaD6T->SetParameter(2,5.11);
205 // fAntiLambdaPythiaD6T->SetParameter(0,0.54);
206 // fAntiLambdaPythiaD6T->SetParameter(1,0.216);
207 // fAntiLambdaPythiaD6T->SetParameter(2,5.11);
208 fK0Data->SetParameter(0,1.0);
209 fK0Data->SetParameter(1,0.215);
210 fK0Data->SetParameter(2,6.79);
211 fLambdaData->SetParameter(0,1.0);
212 fLambdaData->SetParameter(1,0.290);
213 fLambdaData->SetParameter(2,9.28);
214 fAntiLambdaData->SetParameter(0,1.0);
215 fAntiLambdaData->SetParameter(1,0.290);
216 fAntiLambdaData->SetParameter(2,9.28);
218 if(fLambdaEnhancement) delete fLambdaEnhancement;
219 fLambdaEnhancement = new TF1("fLambdaEnhancement","([0]*pow(x,[1])*exp(-pow(x/[2],[3])))/([4]*exp(-pow([5]/x,[6]))+[7]*x)",0,50);
220 fLambdaEnhancement->SetParameter(0,0.5630487);
221 fLambdaEnhancement->SetParameter(1,1.388818);
222 fLambdaEnhancement->SetParameter(2,3.954147);
223 fLambdaEnhancement->SetParameter(3,3.443772);
224 fLambdaEnhancement->SetParameter(4,2.844288);
225 fLambdaEnhancement->SetParameter(5,2);
226 fLambdaEnhancement->SetParameter(6,0.4747893);
227 fLambdaEnhancement->SetParameter(7,-0.2250856);
228 if(fProtonEnhancement) delete fProtonEnhancement;
229 fProtonEnhancement = new TF1("fProtonEnhancement","[0]*pow(x,[1])*exp(-pow(x/[2],[3]))/([4]+[5]*x)",0,50);
230 fProtonEnhancement->SetParameter(0,0.5630487*1.6);
231 fProtonEnhancement->SetParameter(1,1.388818);
232 fProtonEnhancement->SetParameter(2,3.954147/1.5);
233 fProtonEnhancement->SetParameter(3,3.443772/2.5);
234 fProtonEnhancement->SetParameter(4,0.5);
235 fProtonEnhancement->SetParameter(5,-.03);
238 void AliAnalysisEtCommon::ResetEventValues()
239 {//Resets event values of et to zero
241 if (!fCuts) { // some Init's needed
242 cout << __FILE__ << ":" << __LINE__ << " : Init " << endl;
244 cout << " setting up Cuts " << endl;
245 fCuts = new AliAnalysisEtCuts();
250 Double_t AliAnalysisEtCommon::LevyPtEvaluate(const Double_t *pt,
252 {//LevyPt function for TF1's
254 Double_t lMass = par[3];
255 Double_t ldNdy = par[0];
256 Double_t l2pi = 2*TMath::Pi();
257 Double_t lTemp = par[1];
258 Double_t lPower = par[2];
260 Double_t lBigCoef = ((lPower-1)*(lPower-2)) / (l2pi*lPower*lTemp*(lPower*lTemp+lMass*(lPower-2)));
261 Double_t lInPower = 1 + (TMath::Sqrt(pt[0]*pt[0]+lMass*lMass)-lMass) / (lPower*lTemp);
263 return ldNdy * pt[0] * lBigCoef * TMath::Power(lInPower,(-1)*lPower);
267 Float_t AliAnalysisEtCommon::Et(TParticle *part, float mass){//function to calculate et in the same way as it would be calculated in a calorimeter
268 if(mass+1000<0.01){//if no mass given return default. The default argument is -1000
269 if(TMath::Abs(part->GetPDG(0)->PdgCode())==2212 || TMath::Abs(part->GetPDG(0)->PdgCode())==2112){
270 if(part->GetPDG(0)->PdgCode()==-2212 || part->GetPDG(0)->PdgCode()==-2112){//antiproton or antineutron
271 //for antinucleons we specifically want to return the kinetic energy plus twice the rest mass
272 return (part->Energy()+part->GetMass())*TMath::Sin(part->Theta());
274 if(part->GetPDG(0)->PdgCode()==2212 || part->GetPDG(0)->PdgCode()==2112){//proton or neutron
275 //for nucleons we specifically want to return the kinetic energy only
276 return (part->Energy()-part->GetMass())*TMath::Sin(part->Theta());
279 else{//otherwise go to the default
280 return part->Energy()*TMath::Sin(part->Theta());
283 else{//otherwise use the mass that was given
284 return (TMath::Sqrt(TMath::Power(part->P(),2.0)+TMath::Power(mass,2.0)))*TMath::Sin(part->Theta());
288 Float_t AliAnalysisEtCommon::Et(Float_t p, Float_t theta, Int_t pid, Short_t charge) const {//function to calculate et in the same way as it would be calculated in a calorimeter
289 if(pid==fgPiPlusCode || pid==fgPiMinusCode){//Nothing special for pions
290 return TMath::Sqrt(p*p + fgPionMass*fgPionMass) * TMath::Sin(theta);
292 if(pid==fgKPlusCode || pid==fgKMinusCode){//Nothing special for kaons
293 return TMath::Sqrt(p*p + fgKaonMass*fgKaonMass) * TMath::Sin(theta);
295 if(pid==fgEPlusCode || pid==fgEMinusCode){//Nothing special for electrons
296 return TMath::Sqrt(p*p + fgElectronMass*fgElectronMass) * TMath::Sin(theta);
298 if(pid==fgProtonCode || pid==fgAntiProtonCode){//But for protons we must be careful...
299 if(charge<0.0){//antiprotns: kinetic energy plus twice the rest mass
300 return (TMath::Sqrt(p*p + fgProtonMass*fgProtonMass) + fgProtonMass) * TMath::Sin(theta);
302 if(charge>0.0){//antiprotns: kinetic energy only
303 return (TMath::Sqrt(p*p + fgProtonMass*fgProtonMass) - fgProtonMass) * TMath::Sin(theta);
306 cerr<<"Uh-oh! Et not set properly!"<<endl;
310 Float_t AliAnalysisEtCommon::K0Weight(Float_t pt){
311 Float_t data = fK0Data->Eval(pt);
312 Float_t mc = fK0PythiaD6T->Eval(pt);
315 Float_t AliAnalysisEtCommon::LambdaWeight(Float_t pt){
316 Float_t data = fLambdaData->Eval(pt);
317 Float_t mc = fLambdaPythiaD6T->Eval(pt);
320 Float_t AliAnalysisEtCommon::AntiLambdaWeight(Float_t pt){
321 Float_t data = fAntiLambdaData->Eval(pt);
322 Float_t mc = fAntiLambdaPythiaD6T->Eval(pt);
326 Float_t AliAnalysisEtCommon::LambdaBaryonEnhancement(Float_t pt){
327 if(pt<0.8) return 1.0;
328 return fLambdaEnhancement->Eval(pt);
329 };//Function which gives the factor to reweigh a lambda or antilambda so it roughly matches baryon enhancement seen at RHIC
330 Float_t AliAnalysisEtCommon::ProtonBaryonEnhancement(Float_t pt){
331 if(pt<0.8) return 1.0;
332 return fProtonEnhancement->Eval(pt);
333 }//Function which gives the factor to reweigh a lambda or antilambda so it roughly matches baryon enhancement seen at RHIC