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// |
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// Example to get pamela tracks and integrate the trajectory in the apparatus |
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// |
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// The tracking method evaluates, besides the track intersection coordinates at given z-coordinates, |
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// the track length (total and between two given points along the trajectory) and the projected angles. |
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// |
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// --- Modified on January 2007 --- |
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// |
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// see the comment at the beginning of example1.C |
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// |
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example2(TString file){ |
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|
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gROOT->Reset(); |
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// |
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// create some histograms |
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// |
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TH1F* s1x = new TH1F("s1x","Track x impact position on S1",100,-30.,30.); |
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TH1F* s1y = new TH1F("s1y","Track y impact position on S1",100,-30.,30.); |
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TH1F* s2x = new TH1F("s2x","Track x impact position on S2",100,-30.,30.); |
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TH1F* s2y = new TH1F("s2y","Track y impact position on S2",100,-30.,30.); |
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TH1F* s3x = new TH1F("s3x","Track x impact position on S3",100,-30.,30.); |
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TH1F* s3y = new TH1F("s3y","Track y impact position on S3",100,-30.,30.); |
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|
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TH1F* s1tx = new TH1F("s1tx","Track x projected angle on S1",50,-20.,20.); |
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TH1F* s1ty = new TH1F("s1ty","Track y projected angle on S1",50,-20.,20.); |
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TH1F* s2tx = new TH1F("s2tx","Track x projected angle on S2",50,-20.,20.); |
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TH1F* s2ty = new TH1F("s2ty","Track y projected angle on S2",50,-20.,20.); |
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TH1F* s3tx = new TH1F("s3tx","Track x projected angle on S3",50,-20.,20.); |
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TH1F* s3ty = new TH1F("s3ty","Track y projected angle on S3",50,-20.,20.); |
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|
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TH1F* trl = new TH1F("trl","Track length",100,0.,100.); |
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TH1F* trl12 = new TH1F("trl12","Track length S1-S2",100,0.,100.); |
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TH1F* trl23 = new TH1F("trl23","Track length S2-S3",100,0.,100.); |
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|
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|
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// |
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PamLevel2* pam_event = new PamLevel2(); // << create pamela event |
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// |
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TFile f(file); |
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// |
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TTree *T = pam_event->GetPamTree(&f); // << get Pamela trees from file f |
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Int_t nevent = T->GetEntries(); |
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// ******************** |
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// load magnetic field |
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// ******************** |
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pam_event->GetTrkLevel2()->LoadField("./magnetic-field/"); // |
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// ******************** |
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// initialize some trajectories |
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// ******************** |
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// << default trajectory is created with 10 points between the upper and lower tracker planes |
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Trajectory *tr1 = new Trajectory() ; // << create a default trajectory |
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// << the number of points can be set by the user |
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Trajectory *tr2 = new Trajectory(100) ; // << create a trajectory with 100 points |
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// << and also the z-coordinates can be set by the user. |
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// << for example if we want to evaluate the track intersection points in the TOF planes |
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// << we can define the following trajectory |
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Int_t nz = 6; Float_t zin[6]; // << define TOF z-coordinates |
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for(Int_t ip=0; ip<nz; ip++) |
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zin[ip] = pam_event->GetToFLevel2()->GetZTOF(pam_event->GetToFLevel2()->GetToFPlaneID(ip)); // << read ToF plane z-coordinates |
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Trajectory *tr = new Trajectory(nz,zin); // << create a trajectory in the apparatus |
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// |
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cout << endl<< " Start loop over events "; |
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for (Int_t i=0; i<nevent;i++){ |
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// |
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pam_event->Clear(); |
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|
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T->GetEntry(i); |
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// |
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if(pam_event->GetTrkLevel2()->GetNTracks()==1){ // << select events with only one track |
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// |
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PamTrack *track = pam_event->GetTrack(0); // << retrieve the track |
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// |
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// << perform some track selection |
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// |
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if( |
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track->GetTrkTrack()->chi2 > 0 && |
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track->GetTrkTrack()->chi2 < 100 && |
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track->GetTrkTrack()->GetNX() >= 4 && |
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track->GetTrkTrack()->GetNY() >= 3 && |
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true |
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){ |
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|
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cout << endl<< "***** First trajectory"<< endl; |
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track->GetTrkTrack()->DoTrack2(tr1); // << calculate the first trajectory in magnetic field |
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// tr1->Dump(); // dump the trajectory |
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cout << "Length: "<< tr1->GetLength()<<endl; // << get the track length |
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// |
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cout << endl<< "***** Second trajectory"<< endl; |
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track->GetTrkTrack()->DoTrack2(tr2); // << calculate trajectory in magnetic field |
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cout << "Length: "<< tr2->GetLength()<<endl; // << get the track length |
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// |
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cout << endl<< "***** Third trajectory"<< endl; |
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track->GetTrkTrack()->DoTrack2(tr); // << calculate trajectory in magnetic field |
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// tr->Dump(); |
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cout << "Length (S11-S32): "<< tr->GetLength()<<endl; |
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// << The length can be evaluated also bewteen two planes set by the user |
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cout << "Length between S11-S21: "<< tr->GetLength(0,2)<< endl; |
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cout << "Length between S21-S31: "<< tr->GetLength(2,4)<< endl; |
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cout << "Length between S11-S31: "<< tr->GetLength(0,4)<< endl; |
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// now fills some histos: |
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// store calculated coordinates |
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s1x->Fill( tr->x[0] ); |
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s1y->Fill( tr->y[0] ); |
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s2x->Fill( tr->x[1] ); |
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s2y->Fill( tr->y[1] ); |
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s3x->Fill( tr->x[2] ); |
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s3y->Fill( tr->y[2] ); |
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// store calculated projected angles |
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s1tx->Fill( tr->thx[0] ); |
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s1ty->Fill( tr->thy[0] ); |
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s2tx->Fill( tr->thx[1] ); |
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s2ty->Fill( tr->thy[1] ); |
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s3tx->Fill( tr->thx[2] ); |
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s3ty->Fill( tr->thy[2] ); |
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|
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// store calculated track lengths |
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trl->Fill( tr->GetLength() ); |
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trl12->Fill( tr->GetLength(0,1) ); |
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trl23->Fill( tr->GetLength(1,2) ); |
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}; |
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}; |
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}; |
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cout << endl << " Done "<< endl<<endl; |
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// |
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// close file |
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// |
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f.Close(); |
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// |
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// plot histos |
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// |
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} |
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