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() :
74 fHistogramNameSuffix("")
77 ,fEsdtrackCutsITSTPC(0)
82 ,fAntiLambdaPythiaD6T(0)
86 ,fLambdaEnhancement(0)
87 ,fProtonEnhancement(0)
88 {//default constructor
92 AliAnalysisEtCommon::~AliAnalysisEtCommon()
95 delete fEsdtrackCutsITSTPC;
96 delete fEsdtrackCutsITS;
97 delete fEsdtrackCutsTPC;
99 delete fLambdaPythiaD6T;
100 delete fAntiLambdaPythiaD6T;
103 delete fAntiLambdaData;
104 delete fLambdaEnhancement;
105 delete fProtonEnhancement;
108 Int_t AliAnalysisEtCommon::AnalyseEvent(AliVEvent *event)
109 { //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.
110 cout << "This event has " << event->GetNumberOfTracks() << " tracks" << endl;
116 void AliAnalysisEtCommon::Init()
117 {// clear variables, set up cuts and PDG info
118 //MyFunction * fptr = new MyFunction(....); // create the user function class
119 //TF1 * f = new TF1("f",fptr,&MyFunction::Evaluate,0,1,npar,"MyFunction","Evaluate"); // create TF1 class.
120 AliAnalysisLevyPt *function = new AliAnalysisLevyPt();
123 //parameter 2 = power
124 if(fK0PythiaD6T) delete fK0PythiaD6T;
125 if(fLambdaPythiaD6T) delete fLambdaPythiaD6T;
126 if(fAntiLambdaPythiaD6T) delete fAntiLambdaPythiaD6T;
127 if(fK0Data) delete fK0Data;
128 if(fLambdaData) delete fLambdaData;
129 if(fAntiLambdaData) delete fAntiLambdaData;
130 fK0PythiaD6T = new TF1("K0PythiaD6T",function, &AliAnalysisLevyPt::Evaluate,0,50,3,"AliAnalysisLevyPt","Evaluate");
131 fLambdaPythiaD6T = new TF1("LambdaPythiaD6T",function, &AliAnalysisLevyPt::Evaluate,0,50,3,"AliAnalysisLevyPt","Evaluate");
132 fAntiLambdaPythiaD6T = new TF1("LambdaPythiaD6T",function, &AliAnalysisLevyPt::Evaluate,0,50,3,"AliAnalysisLevyPt","Evaluate");
133 fK0Data = new TF1("K0Data",function, &AliAnalysisLevyPt::Evaluate,0,50,3,"AliAnalysisLevyPt","Evaluate");
134 fLambdaData = new TF1("LambdaData",function, &AliAnalysisLevyPt::Evaluate,0,50,3,"AliAnalysisLevyPt","Evaluate");
135 fAntiLambdaData = new TF1("LambdaData",function, &AliAnalysisLevyPt::Evaluate,0,50,3,"AliAnalysisLevyPt","Evaluate");
137 //These data are from the ALICE 900 GeV p+p paper
138 fK0PythiaD6T->SetParameter(0,0.1437);
139 fK0PythiaD6T->SetParameter(1,0.1497);
140 fK0PythiaD6T->SetParameter(2,6.94);
141 fLambdaPythiaD6T->SetParameter(0,0.0213);
142 fLambdaPythiaD6T->SetParameter(1,0.1315);
143 fLambdaPythiaD6T->SetParameter(2,4.60);
144 fAntiLambdaPythiaD6T->SetParameter(0,0.0213);
145 fAntiLambdaPythiaD6T->SetParameter(1,0.1315);
146 fAntiLambdaPythiaD6T->SetParameter(2,4.60);
147 fK0Data->SetParameter(0,0.184);
148 fK0Data->SetParameter(1,0.168);
149 fK0Data->SetParameter(2,6.6);
150 fLambdaData->SetParameter(0,0.048);
151 fLambdaData->SetParameter(1,0.229);
152 fLambdaData->SetParameter(2,10.8);
153 fAntiLambdaData->SetParameter(0,0.047);
154 fAntiLambdaData->SetParameter(1,0.210);
155 fAntiLambdaData->SetParameter(2,9.2);
157 if(fDataSet==2010 ||fDataSet==20100 ){
158 //These data are from the CMS analysis note on 7 TeV spectra
159 //http://cdsweb.cern.ch/record/1279344/files/QCD-10-007-pas.pdf
160 //Note the CMS parameterization of the Levy function differs from the ALICE parameterization by a constant.
161 //CMS does not list the overall constant in their fit, the ratios of the dN/dy(y=0) is used.
162 fK0PythiaD6T->SetParameter(0,0.72);
163 fK0PythiaD6T->SetParameter(1,0.183);
164 fK0PythiaD6T->SetParameter(2,7.41);
165 fLambdaPythiaD6T->SetParameter(0,0.54);
166 fLambdaPythiaD6T->SetParameter(1,0.216);
167 fLambdaPythiaD6T->SetParameter(2,5.71);
168 fAntiLambdaPythiaD6T->SetParameter(0,0.54);
169 fAntiLambdaPythiaD6T->SetParameter(1,0.216);
170 fAntiLambdaPythiaD6T->SetParameter(2,5.71);
171 fK0Data->SetParameter(0,1.0);
172 fK0Data->SetParameter(1,0.215);
173 fK0Data->SetParameter(2,6.79);
174 fLambdaData->SetParameter(0,1.0);
175 fLambdaData->SetParameter(1,0.290);
176 fLambdaData->SetParameter(2,9.28);
177 fAntiLambdaData->SetParameter(0,1.0);
178 fAntiLambdaData->SetParameter(1,0.290);
179 fAntiLambdaData->SetParameter(2,9.28);
181 if(fLambdaEnhancement) delete fLambdaEnhancement;
182 fLambdaEnhancement = new TF1("fLambdaEnhancement","([0]*pow(x,[1])*exp(-pow(x/[2],[3])))/([4]*exp(-pow([5]/x,[6]))+[7]*x)",0,50);
183 fLambdaEnhancement->SetParameter(0,0.5630487);
184 fLambdaEnhancement->SetParameter(1,1.388818);
185 fLambdaEnhancement->SetParameter(2,3.954147);
186 fLambdaEnhancement->SetParameter(3,3.443772);
187 fLambdaEnhancement->SetParameter(4,2.844288);
188 fLambdaEnhancement->SetParameter(5,2);
189 fLambdaEnhancement->SetParameter(6,0.4747893);
190 fLambdaEnhancement->SetParameter(7,-0.2250856);
191 if(fProtonEnhancement) delete fProtonEnhancement;
192 fProtonEnhancement = new TF1("fProtonEnhancement","[0]*pow(x,[1])*exp(-pow(x/[2],[3]))/([4]+[5]*x)",0,50);
193 fProtonEnhancement->SetParameter(0,0.5630487*1.6);
194 fProtonEnhancement->SetParameter(1,1.388818);
195 fProtonEnhancement->SetParameter(2,3.954147/1.5);
196 fProtonEnhancement->SetParameter(3,3.443772/2.5);
197 fProtonEnhancement->SetParameter(4,0.5);
198 fProtonEnhancement->SetParameter(5,-.03);
201 void AliAnalysisEtCommon::ResetEventValues()
202 {//Resets event values of et to zero
204 if (!fCuts) { // some Init's needed
205 cout << __FILE__ << ":" << __LINE__ << " : Init " << endl;
207 cout << " setting up Cuts " << endl;
208 fCuts = new AliAnalysisEtCuts();
214 Float_t AliAnalysisEtCommon::Et(TParticle *part, float mass){//function to calculate et in the same way as it would be calculated in a calorimeter
215 if(mass+1000<0.01){//if no mass given return default. The default argument is -1000
216 if(TMath::Abs(part->GetPDG(0)->PdgCode())==2212 || TMath::Abs(part->GetPDG(0)->PdgCode())==2112){
217 if(part->GetPDG(0)->PdgCode()==-2212 || part->GetPDG(0)->PdgCode()==-2112){//antiproton or antineutron
218 //for antinucleons we specifically want to return the kinetic energy plus twice the rest mass
219 return (part->Energy()+part->GetMass())*TMath::Sin(part->Theta());
221 if(part->GetPDG(0)->PdgCode()==2212 || part->GetPDG(0)->PdgCode()==2112){//proton or neutron
222 //for nucleons we specifically want to return the kinetic energy only
223 return (part->Energy()-part->GetMass())*TMath::Sin(part->Theta());
226 else{//otherwise go to the default
227 return part->Energy()*TMath::Sin(part->Theta());
230 else{//otherwise use the mass that was given
231 return (TMath::Sqrt(TMath::Power(part->P(),2.0)+TMath::Power(mass,2.0)))*TMath::Sin(part->Theta());
235 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
236 if(pid==fgPiPlusCode || pid==fgPiMinusCode){//Nothing special for pions
237 return TMath::Sqrt(p*p + fgPionMass*fgPionMass) * TMath::Sin(theta);
239 if(pid==fgKPlusCode || pid==fgKMinusCode){//Nothing special for kaons
240 return TMath::Sqrt(p*p + fgKaonMass*fgKaonMass) * TMath::Sin(theta);
242 if(pid==fgEPlusCode || pid==fgEMinusCode){//Nothing special for electrons
243 return TMath::Sqrt(p*p + fgElectronMass*fgElectronMass) * TMath::Sin(theta);
245 if(pid==fgProtonCode || pid==fgAntiProtonCode){//But for protons we must be careful...
246 if(charge<0.0){//antiprotns: kinetic energy plus twice the rest mass
247 return (TMath::Sqrt(p*p + fgProtonMass*fgProtonMass) + fgProtonMass) * TMath::Sin(theta);
249 if(charge>0.0){//antiprotns: kinetic energy only
250 return (TMath::Sqrt(p*p + fgProtonMass*fgProtonMass) - fgProtonMass) * TMath::Sin(theta);
253 cerr<<"Uh-oh! Et not set properly!"<<endl;
257 Float_t AliAnalysisEtCommon::K0Weight(Float_t pt){
258 Float_t data = fK0Data->Eval(pt);
259 Float_t mc = fK0PythiaD6T->Eval(pt);
262 Float_t AliAnalysisEtCommon::LambdaWeight(Float_t pt){
263 Float_t data = fLambdaData->Eval(pt);
264 Float_t mc = fLambdaPythiaD6T->Eval(pt);
267 Float_t AliAnalysisEtCommon::AntiLambdaWeight(Float_t pt){
268 Float_t data = fAntiLambdaData->Eval(pt);
269 Float_t mc = fAntiLambdaPythiaD6T->Eval(pt);
273 Float_t AliAnalysisEtCommon::LambdaBaryonEnhancement(Float_t pt){
274 if(pt<0.8) return 1.0;
275 return fLambdaEnhancement->Eval(pt);
276 };//Function which gives the factor to reweigh a lambda or antilambda so it roughly matches baryon enhancement seen at RHIC
277 Float_t AliAnalysisEtCommon::ProtonBaryonEnhancement(Float_t pt){
278 if(pt<0.8) return 1.0;
279 return fProtonEnhancement->Eval(pt);
280 }//Function which gives the factor to reweigh a lambda or antilambda so it roughly matches baryon enhancement seen at RHIC