1 /////////////////////////////////////////////////////////////////////////////////
3 // AliFemtoPairCutRadialDistance - a pair cut which checks //
4 // for some pair qualities that attempt to identify slit/doubly //
5 // reconstructed tracks and also selects pairs based on their separation //
6 // at the entrance to the TPC //
8 /////////////////////////////////////////////////////////////////////////////////
9 /********************************************************************************
11 * Author: Johanna Gramling, University of Heidelberg, jgramlin@cern.ch
12 * Malgorzata Janik, Warsaw University of Technology, majanik@cern.ch
13 * Lukasz Graczykowski, Warsaw University of Technology, lgraczyk@cern.ch
15 ********************************************************************************/
17 #include "AliFemtoPairCutRadialDistance.h"
22 ClassImp(AliFemtoPairCutRadialDistance)
26 AliFemtoPairCutRadialDistance::AliFemtoPairCutRadialDistance():
27 AliFemtoPairCutAntiGamma(),
36 AliFemtoPairCutRadialDistance::AliFemtoPairCutRadialDistance(const AliFemtoPairCutRadialDistance& c) :
37 AliFemtoPairCutAntiGamma(c),
44 fDPhiStarMin = c.fDPhiStarMin;
47 fMagSign = c.fMagSign;
48 fPhistarmin = c.fPhistarmin;
52 AliFemtoPairCutRadialDistance::~AliFemtoPairCutRadialDistance(){
55 AliFemtoPairCutRadialDistance& AliFemtoPairCutRadialDistance::operator=(const AliFemtoPairCutRadialDistance& c)
58 fDPhiStarMin = c.fDPhiStarMin;
61 fMagSign = c.fMagSign;
62 fPhistarmin = c.fPhistarmin;
69 bool AliFemtoPairCutRadialDistance::Pass(const AliFemtoPair* pair){
70 // Accept pairs based on their TPC entrance separation and
71 // quality and sharity
74 // double pih = 3.14159265358979312;
75 // double pit = 6.28318530717958623;
77 double phi1 = pair->Track1()->Track()->P().Phi();
78 double phi2 = pair->Track2()->Track()->P().Phi();
79 double chg1 = pair->Track1()->Track()->Charge();
80 double chg2 = pair->Track2()->Track()->Charge();
81 double ptv1 = pair->Track1()->Track()->Pt();
82 double ptv2 = pair->Track2()->Track()->Pt();
83 double eta1 = pair->Track1()->Track()->P().PseudoRapidity();
84 double eta2 = pair->Track2()->Track()->P().PseudoRapidity();
87 AliAODInputHandler *aodH = dynamic_cast<AliAODInputHandler*> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
88 Double_t magsign = 0.0;
91 // AliWarning("Could not get AODInputHandler");
96 fAOD = aodH->GetEvent();
97 magsign = fAOD->GetMagneticField();
102 else if ( magsign < 1)
107 //cout << "mag sign = " << magsign << endl;
110 Bool_t pass5 = kTRUE;
115 for (rad = 0.8; rad < 2.5; rad += 0.01) {
116 Double_t dps = (phi2-phi1+(TMath::ASin(-0.075*chg2*fMagSign*rad/ptv2))-(TMath::ASin(-0.075*chg1*fMagSign*rad/ptv1)));
117 dps = TVector2::Phi_mpi_pi(dps);
118 Double_t etad = eta2 - eta1;
119 if (fabs(etad)<fEtaMin && fabs(dps)<fDPhiStarMin) {
120 // cout << "5% cut is not passed - returning" << endl;
128 double afsi0b = 0.07510020733*chg1*fMagSign*rad/ptv1;
129 double afsi1b = 0.07510020733*chg2*fMagSign*rad/ptv2;
131 if (fabs(afsi0b) >=1.) return kTRUE;
132 if (fabs(afsi1b) >=1.) return kTRUE;
134 Double_t dps = phi2 - phi1 + TMath::ASin(afsi1b) - TMath::ASin(afsi0b);
135 dps = TVector2::Phi_mpi_pi(dps);
137 Double_t etad = eta2 - eta1;
138 if (fabs(etad)<fEtaMin && fabs(dps)<fDPhiStarMin) {
145 pass5 = AliFemtoPairCutAntiGamma::Pass(pair);
154 AliFemtoString AliFemtoPairCutRadialDistance::Report(){
155 // Prepare a report from the execution
156 string stemp = "AliFemtoRadialDistance Pair Cut - remove shared and split pairs and pairs with small separation at the specified radius\n"; char ctemp[100];
157 snprintf(ctemp , 100, "Accept pair with separation more that %f",fDPhiStarMin);
159 snprintf(ctemp , 100, "Number of pairs which passed:\t%ld Number which failed:\t%ld\n",fNPairsPassed,fNPairsFailed);
161 AliFemtoString returnThis = stemp;
165 TList *AliFemtoPairCutRadialDistance::ListSettings()
167 // return a list of settings in a writable form
168 TList *tListSetttings = AliFemtoPairCutAntiGamma::ListSettings();
170 snprintf(buf, 200, "AliFemtoPairCutRadialDistance.phistarsepmin=%f", fDPhiStarMin);
171 tListSetttings->AddLast(new TObjString(buf));
173 return tListSetttings;
176 void AliFemtoPairCutRadialDistance::SetPhiStarDifferenceMinimum(double dtpc)
181 void AliFemtoPairCutRadialDistance::SetEtaDifferenceMinimum(double etpc)
187 void AliFemtoPairCutRadialDistance::SetMinimumRadius(double minrad)
192 void AliFemtoPairCutRadialDistance::SetMagneticFieldSign(int magsign)
194 if(magsign>1) fMagSign = 1;
195 else if(magsign<1) fMagSign = -1;
196 else fMagSign = magsign;
199 void AliFemtoPairCutRadialDistance::SetPhiStarMin(Bool_t phistarmin)
201 fPhistarmin = phistarmin;