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::fgK0SCode = 310;
48 Int_t AliAnalysisEtCommon::fgOmegaCode = 3334;
49 Int_t AliAnalysisEtCommon::fgAntiOmegaCode = -3334;
50 Int_t AliAnalysisEtCommon::fgXi0Code = 3322;
51 Int_t AliAnalysisEtCommon::fgAntiXi0Code = -3322;
52 Int_t AliAnalysisEtCommon::fgXiCode = 3312;
53 Int_t AliAnalysisEtCommon::fgAntiXiCode = -3312;
54 Int_t AliAnalysisEtCommon::fgSigmaCode = 3112;
55 Int_t AliAnalysisEtCommon::fgAntiSigmaCode = -3112;
56 Int_t AliAnalysisEtCommon::fgK0LCode = 130;
57 Int_t AliAnalysisEtCommon::fgNeutronCode = 2112;
58 Int_t AliAnalysisEtCommon::fgAntiNeutronCode = -2112;
59 Int_t AliAnalysisEtCommon::fgEPlusCode = -11;
60 Int_t AliAnalysisEtCommon::fgEMinusCode = 11;
61 Int_t AliAnalysisEtCommon::fgMuPlusCode = -13;
62 Int_t AliAnalysisEtCommon::fgMuMinusCode = 13;
63 Int_t AliAnalysisEtCommon::fgGammaCode = 22;
64 Int_t AliAnalysisEtCommon::fgPi0Code = 111;
65 Int_t AliAnalysisEtCommon::fgEtaCode = 221;
66 Int_t AliAnalysisEtCommon::fgOmega0Code = 223;
70 Float_t AliAnalysisEtCommon::fgPtTPCCutOff = 0.15;
71 Float_t AliAnalysisEtCommon::fgPtITSCutOff = 0.10;
73 AliAnalysisEtCommon::AliAnalysisEtCommon() : TObject()
74 ,fHistogramNameSuffix("")
77 ,fEsdtrackCutsITSTPC(0)
82 ,fAntiLambdaPythiaD6T(0)
86 ,fLambdaEnhancement(0)
87 ,fProtonEnhancement(0)
88 ,fCentralityMethod("V0M")
91 {//default constructor
95 AliAnalysisEtCommon::~AliAnalysisEtCommon()
98 delete fEsdtrackCutsITSTPC;
99 delete fEsdtrackCutsITS;
100 delete fEsdtrackCutsTPC;
102 delete fLambdaPythiaD6T;
103 delete fAntiLambdaPythiaD6T;
106 delete fAntiLambdaData;
107 delete fLambdaEnhancement;
108 delete fProtonEnhancement;
111 Int_t AliAnalysisEtCommon::AnalyseEvent(AliVEvent *event)
112 { //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.
113 cout << "This event has " << event->GetNumberOfTracks() << " tracks" << endl;
119 void AliAnalysisEtCommon::Init()
120 {// clear variables, set up cuts and PDG info
121 //MyFunction * fptr = new MyFunction(....); // create the user function class
122 //TF1 * f = new TF1("f",fptr,&MyFunction::Evaluate,0,1,npar,"MyFunction","Evaluate"); // create TF1 class.
123 AliAnalysisLevyPt *function = new AliAnalysisLevyPt();
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;
133 fK0PythiaD6T = new TF1("K0PythiaD6T",function, &AliAnalysisLevyPt::Evaluate,0,50,4,"AliAnalysisLevyPt","Evaluate");
134 fLambdaPythiaD6T = new TF1("LambdaPythiaD6T",function, &AliAnalysisLevyPt::Evaluate,0,50,4,"AliAnalysisLevyPt","Evaluate");
135 fAntiLambdaPythiaD6T = new TF1("LambdaPythiaD6T",function, &AliAnalysisLevyPt::Evaluate,0,50,4,"AliAnalysisLevyPt","Evaluate");
136 fK0Data = new TF1("K0Data",function, &AliAnalysisLevyPt::Evaluate,0,50,4,"AliAnalysisLevyPt","Evaluate");
137 fLambdaData = new TF1("LambdaData",function, &AliAnalysisLevyPt::Evaluate,0,50,4,"AliAnalysisLevyPt","Evaluate");
138 fAntiLambdaData = new TF1("LambdaData",function, &AliAnalysisLevyPt::Evaluate,0,50,4,"AliAnalysisLevyPt","Evaluate");
139 fK0PythiaD6T->FixParameter(3,0.493677);
140 fK0Data->FixParameter(3,0.493677);
141 fLambdaPythiaD6T->FixParameter(3,1.115683);
142 fAntiLambdaPythiaD6T->FixParameter(3,1.115683);
143 fLambdaData->FixParameter(3,1.115683);
144 fAntiLambdaData->FixParameter(3,1.115683);
146 //These data are from the ALICE 900 GeV p+p paper
147 fK0PythiaD6T->SetParameter(0,0.1437);
148 fK0PythiaD6T->SetParameter(1,0.1497);
149 fK0PythiaD6T->SetParameter(2,6.94);
150 fLambdaPythiaD6T->SetParameter(0,0.0213);
151 fLambdaPythiaD6T->SetParameter(1,0.1315);
152 fLambdaPythiaD6T->SetParameter(2,4.60);
153 fAntiLambdaPythiaD6T->SetParameter(0,0.0213);
154 fAntiLambdaPythiaD6T->SetParameter(1,0.1315);
155 fAntiLambdaPythiaD6T->SetParameter(2,4.60);
156 fK0Data->SetParameter(0,0.184);
157 fK0Data->SetParameter(1,0.168);
158 fK0Data->SetParameter(2,6.6);
159 fLambdaData->SetParameter(0,0.048);
160 fLambdaData->SetParameter(1,0.229);
161 fLambdaData->SetParameter(2,10.8);
162 fAntiLambdaData->SetParameter(0,0.047);
163 fAntiLambdaData->SetParameter(1,0.210);
164 fAntiLambdaData->SetParameter(2,9.2);
166 if(fDataSet==2010 ||fDataSet==20100 ){
167 //These data are from the CMS analysis note on 7 TeV spectra
168 //http://cdsweb.cern.ch/record/1279344/files/QCD-10-007-pas.pdf
169 //Note the CMS parameterization of the Levy function differs from the ALICE parameterization by a constant.
170 //CMS does not list the overall constant in their fit, the ratios of the dN/dy(y=0) is used.
171 fK0PythiaD6T->SetParameter(0,0.72);
172 fK0PythiaD6T->SetParameter(1,0.183);
173 fK0PythiaD6T->SetParameter(2,7.41);
174 fLambdaPythiaD6T->SetParameter(0,0.54);
175 fLambdaPythiaD6T->SetParameter(1,0.216);
176 fLambdaPythiaD6T->SetParameter(2,5.71);
177 fAntiLambdaPythiaD6T->SetParameter(0,0.54);
178 fAntiLambdaPythiaD6T->SetParameter(1,0.216);
179 fAntiLambdaPythiaD6T->SetParameter(2,5.71);
180 fK0Data->SetParameter(0,1.0);
181 fK0Data->SetParameter(1,0.215);
182 fK0Data->SetParameter(2,6.79);
183 fLambdaData->SetParameter(0,1.0);
184 fLambdaData->SetParameter(1,0.290);
185 fLambdaData->SetParameter(2,9.28);
186 fAntiLambdaData->SetParameter(0,1.0);
187 fAntiLambdaData->SetParameter(1,0.290);
188 fAntiLambdaData->SetParameter(2,9.28);
190 if(fLambdaEnhancement) delete fLambdaEnhancement;
191 fLambdaEnhancement = new TF1("fLambdaEnhancement","([0]*pow(x,[1])*exp(-pow(x/[2],[3])))/([4]*exp(-pow([5]/x,[6]))+[7]*x)",0,50);
192 fLambdaEnhancement->SetParameter(0,0.5630487);
193 fLambdaEnhancement->SetParameter(1,1.388818);
194 fLambdaEnhancement->SetParameter(2,3.954147);
195 fLambdaEnhancement->SetParameter(3,3.443772);
196 fLambdaEnhancement->SetParameter(4,2.844288);
197 fLambdaEnhancement->SetParameter(5,2);
198 fLambdaEnhancement->SetParameter(6,0.4747893);
199 fLambdaEnhancement->SetParameter(7,-0.2250856);
200 if(fProtonEnhancement) delete fProtonEnhancement;
201 fProtonEnhancement = new TF1("fProtonEnhancement","[0]*pow(x,[1])*exp(-pow(x/[2],[3]))/([4]+[5]*x)",0,50);
202 fProtonEnhancement->SetParameter(0,0.5630487*1.6);
203 fProtonEnhancement->SetParameter(1,1.388818);
204 fProtonEnhancement->SetParameter(2,3.954147/1.5);
205 fProtonEnhancement->SetParameter(3,3.443772/2.5);
206 fProtonEnhancement->SetParameter(4,0.5);
207 fProtonEnhancement->SetParameter(5,-.03);
210 void AliAnalysisEtCommon::ResetEventValues()
211 {//Resets event values of et to zero
213 if (!fCuts) { // some Init's needed
214 cout << __FILE__ << ":" << __LINE__ << " : Init " << endl;
216 cout << " setting up Cuts " << endl;
217 fCuts = new AliAnalysisEtCuts();
223 Float_t AliAnalysisEtCommon::Et(TParticle *part, float mass){//function to calculate et in the same way as it would be calculated in a calorimeter
224 if(mass+1000<0.01){//if no mass given return default. The default argument is -1000
225 if(TMath::Abs(part->GetPDG(0)->PdgCode())==2212 || TMath::Abs(part->GetPDG(0)->PdgCode())==2112){
226 if(part->GetPDG(0)->PdgCode()==-2212 || part->GetPDG(0)->PdgCode()==-2112){//antiproton or antineutron
227 //for antinucleons we specifically want to return the kinetic energy plus twice the rest mass
228 return (part->Energy()+part->GetMass())*TMath::Sin(part->Theta());
230 if(part->GetPDG(0)->PdgCode()==2212 || part->GetPDG(0)->PdgCode()==2112){//proton or neutron
231 //for nucleons we specifically want to return the kinetic energy only
232 return (part->Energy()-part->GetMass())*TMath::Sin(part->Theta());
235 else{//otherwise go to the default
236 return part->Energy()*TMath::Sin(part->Theta());
239 else{//otherwise use the mass that was given
240 return (TMath::Sqrt(TMath::Power(part->P(),2.0)+TMath::Power(mass,2.0)))*TMath::Sin(part->Theta());
244 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
245 if(pid==fgPiPlusCode || pid==fgPiMinusCode){//Nothing special for pions
246 return TMath::Sqrt(p*p + fgPionMass*fgPionMass) * TMath::Sin(theta);
248 if(pid==fgKPlusCode || pid==fgKMinusCode){//Nothing special for kaons
249 return TMath::Sqrt(p*p + fgKaonMass*fgKaonMass) * TMath::Sin(theta);
251 if(pid==fgEPlusCode || pid==fgEMinusCode){//Nothing special for electrons
252 return TMath::Sqrt(p*p + fgElectronMass*fgElectronMass) * TMath::Sin(theta);
254 if(pid==fgProtonCode || pid==fgAntiProtonCode){//But for protons we must be careful...
255 if(charge<0.0){//antiprotns: kinetic energy plus twice the rest mass
256 return (TMath::Sqrt(p*p + fgProtonMass*fgProtonMass) + fgProtonMass) * TMath::Sin(theta);
258 if(charge>0.0){//antiprotns: kinetic energy only
259 return (TMath::Sqrt(p*p + fgProtonMass*fgProtonMass) - fgProtonMass) * TMath::Sin(theta);
262 cerr<<"Uh-oh! Et not set properly!"<<endl;
266 Float_t AliAnalysisEtCommon::K0Weight(Float_t pt){
267 Float_t data = fK0Data->Eval(pt);
268 Float_t mc = fK0PythiaD6T->Eval(pt);
271 Float_t AliAnalysisEtCommon::LambdaWeight(Float_t pt){
272 Float_t data = fLambdaData->Eval(pt);
273 Float_t mc = fLambdaPythiaD6T->Eval(pt);
276 Float_t AliAnalysisEtCommon::AntiLambdaWeight(Float_t pt){
277 Float_t data = fAntiLambdaData->Eval(pt);
278 Float_t mc = fAntiLambdaPythiaD6T->Eval(pt);
282 Float_t AliAnalysisEtCommon::LambdaBaryonEnhancement(Float_t pt){
283 if(pt<0.8) return 1.0;
284 return fLambdaEnhancement->Eval(pt);
285 };//Function which gives the factor to reweigh a lambda or antilambda so it roughly matches baryon enhancement seen at RHIC
286 Float_t AliAnalysisEtCommon::ProtonBaryonEnhancement(Float_t pt){
287 if(pt<0.8) return 1.0;
288 return fProtonEnhancement->Eval(pt);
289 }//Function which gives the factor to reweigh a lambda or antilambda so it roughly matches baryon enhancement seen at RHIC