| 1 | /** \class TrackSmearing
|
|---|
| 2 | *
|
|---|
| 3 | * Performs d0, dZ, p, Theta, Phi smearing of tracks.
|
|---|
| 4 | *
|
|---|
| 5 | * \authors A. Hart, M. Selvaggi
|
|---|
| 6 | *
|
|---|
| 7 | */
|
|---|
| 8 |
|
|---|
| 9 | #include "modules/TrackSmearing.h"
|
|---|
| 10 |
|
|---|
| 11 | #include "classes/DelphesClasses.h"
|
|---|
| 12 | #include "classes/DelphesFactory.h"
|
|---|
| 13 | #include "classes/DelphesFormula.h"
|
|---|
| 14 |
|
|---|
| 15 | #include "ExRootAnalysis/ExRootClassifier.h"
|
|---|
| 16 | #include "ExRootAnalysis/ExRootFilter.h"
|
|---|
| 17 | #include "ExRootAnalysis/ExRootResult.h"
|
|---|
| 18 |
|
|---|
| 19 | #include "TDatabasePDG.h"
|
|---|
| 20 | #include "TFile.h"
|
|---|
| 21 | #include "TFormula.h"
|
|---|
| 22 | #include "TLorentzVector.h"
|
|---|
| 23 | #include "TMath.h"
|
|---|
| 24 | #include "TObjArray.h"
|
|---|
| 25 | #include "TProfile2D.h"
|
|---|
| 26 | #include "TRandom3.h"
|
|---|
| 27 | #include "TString.h"
|
|---|
| 28 |
|
|---|
| 29 | #include <algorithm>
|
|---|
| 30 | #include <iostream>
|
|---|
| 31 | #include <sstream>
|
|---|
| 32 | #include <stdexcept>
|
|---|
| 33 |
|
|---|
| 34 | using namespace std;
|
|---|
| 35 |
|
|---|
| 36 | //------------------------------------------------------------------------------
|
|---|
| 37 |
|
|---|
| 38 | TrackSmearing::TrackSmearing() :
|
|---|
| 39 | fD0Formula(0), fDZFormula(0), fPFormula(0), fCtgThetaFormula(0), fPhiFormula(0), fItInputArray(0)
|
|---|
| 40 | {
|
|---|
| 41 | fD0Formula = new DelphesFormula;
|
|---|
| 42 | fDZFormula = new DelphesFormula;
|
|---|
| 43 | fPFormula = new DelphesFormula;
|
|---|
| 44 | fCtgThetaFormula = new DelphesFormula;
|
|---|
| 45 | fPhiFormula = new DelphesFormula;
|
|---|
| 46 | }
|
|---|
| 47 |
|
|---|
| 48 | //------------------------------------------------------------------------------
|
|---|
| 49 |
|
|---|
| 50 | TrackSmearing::~TrackSmearing()
|
|---|
| 51 | {
|
|---|
| 52 | if(fD0Formula) delete fD0Formula;
|
|---|
| 53 | if(fDZFormula) delete fDZFormula;
|
|---|
| 54 | if(fPFormula) delete fPFormula;
|
|---|
| 55 | if(fCtgThetaFormula) delete fCtgThetaFormula;
|
|---|
| 56 | if(fPhiFormula) delete fPhiFormula;
|
|---|
| 57 | }
|
|---|
| 58 |
|
|---|
| 59 | //------------------------------------------------------------------------------
|
|---|
| 60 |
|
|---|
| 61 | void TrackSmearing::Init()
|
|---|
| 62 | {
|
|---|
| 63 | fBz = GetDouble("Bz", 0.0);
|
|---|
| 64 |
|
|---|
| 65 | // read resolution formula
|
|---|
| 66 |
|
|---|
| 67 | // !!! IF WE WANT TO KEEP ROOT INPUT !!!
|
|---|
| 68 | if(string(GetString("D0ResolutionFormula", "0.0")) != "0.0")
|
|---|
| 69 | {
|
|---|
| 70 | fD0Formula->Compile(GetString("D0ResolutionFormula", "0.0"));
|
|---|
| 71 | fUseD0Formula = true;
|
|---|
| 72 | }
|
|---|
| 73 | else
|
|---|
| 74 | {
|
|---|
| 75 | fD0ResolutionFile = GetString("D0ResolutionFile", "errors.root");
|
|---|
| 76 | fD0ResolutionHist = GetString("D0ResolutionHist", "d0");
|
|---|
| 77 | fUseD0Formula = false;
|
|---|
| 78 | }
|
|---|
| 79 | if(string(GetString("DZResolutionFormula", "0.0")) != "0.0")
|
|---|
| 80 | {
|
|---|
| 81 | fDZFormula->Compile(GetString("DZResolutionFormula", "0.0"));
|
|---|
| 82 | fUseDZFormula = true;
|
|---|
| 83 | }
|
|---|
| 84 | else
|
|---|
| 85 | {
|
|---|
| 86 | fDZResolutionFile = GetString("DZResolutionFile", "errors.root");
|
|---|
| 87 | fDZResolutionHist = GetString("DZResolutionHist", "dz");
|
|---|
| 88 | fUseDZFormula = false;
|
|---|
| 89 | }
|
|---|
| 90 | if(string(GetString("PResolutionFormula", "0.0")) != "0.0")
|
|---|
| 91 | {
|
|---|
| 92 | fPFormula->Compile(GetString("PResolutionFormula", "0.0"));
|
|---|
| 93 | fUsePFormula = true;
|
|---|
| 94 | }
|
|---|
| 95 | else
|
|---|
| 96 | {
|
|---|
| 97 | fPResolutionFile = GetString("PResolutionFile", "errors.root");
|
|---|
| 98 | fPResolutionHist = GetString("PResolutionHist", "p");
|
|---|
| 99 | fUsePFormula = false;
|
|---|
| 100 | }
|
|---|
| 101 | if(string(GetString("CtgThetaResolutionFormula", "0.0")) != "0.0")
|
|---|
| 102 | {
|
|---|
| 103 | fCtgThetaFormula->Compile(GetString("CtgThetaResolutionFormula", "0.0"));
|
|---|
| 104 | fUseCtgThetaFormula = true;
|
|---|
| 105 | }
|
|---|
| 106 | else
|
|---|
| 107 | {
|
|---|
| 108 | fCtgThetaResolutionFile = GetString("CtgThetaResolutionFile", "errors.root");
|
|---|
| 109 | fCtgThetaResolutionHist = GetString("CtgThetaResolutionHist", "ctgTheta");
|
|---|
| 110 | fUseCtgThetaFormula = false;
|
|---|
| 111 | }
|
|---|
| 112 | if(string(GetString("PhiResolutionFormula", "0.0")) != "0.0")
|
|---|
| 113 | {
|
|---|
| 114 | fPhiFormula->Compile(GetString("PhiResolutionFormula", "0.0"));
|
|---|
| 115 | fUsePhiFormula = true;
|
|---|
| 116 | }
|
|---|
| 117 | else
|
|---|
| 118 | {
|
|---|
| 119 | fPhiResolutionFile = GetString("PhiResolutionFile", "errors.root");
|
|---|
| 120 | fPhiResolutionHist = GetString("PhiResolutionHist", "phi");
|
|---|
| 121 | fUsePhiFormula = false;
|
|---|
| 122 | }
|
|---|
| 123 |
|
|---|
| 124 | fApplyToPileUp = GetBool("ApplyToPileUp", true);
|
|---|
| 125 |
|
|---|
| 126 | // import input array
|
|---|
| 127 |
|
|---|
| 128 | fInputArray = ImportArray(GetString("InputArray", "ParticlePropagator/stableParticles"));
|
|---|
| 129 | fItInputArray = fInputArray->MakeIterator();
|
|---|
| 130 |
|
|---|
| 131 | // import beamspot
|
|---|
| 132 | try
|
|---|
| 133 | {
|
|---|
| 134 | fBeamSpotInputArray = ImportArray(GetString("BeamSpotInputArray", "BeamSpotFilter/beamSpotParticle"));
|
|---|
| 135 | }
|
|---|
| 136 | catch(runtime_error &e)
|
|---|
| 137 | {
|
|---|
| 138 | fBeamSpotInputArray = 0;
|
|---|
| 139 | }
|
|---|
| 140 |
|
|---|
| 141 | // create output array
|
|---|
| 142 |
|
|---|
| 143 | fOutputArray = ExportArray(GetString("OutputArray", "stableParticles"));
|
|---|
| 144 | }
|
|---|
| 145 |
|
|---|
| 146 | //------------------------------------------------------------------------------
|
|---|
| 147 |
|
|---|
| 148 | void TrackSmearing::Finish()
|
|---|
| 149 | {
|
|---|
| 150 | if(fItInputArray) delete fItInputArray;
|
|---|
| 151 | }
|
|---|
| 152 |
|
|---|
| 153 | //------------------------------------------------------------------------------
|
|---|
| 154 |
|
|---|
| 155 | void TrackSmearing::Process()
|
|---|
| 156 | {
|
|---|
| 157 | Int_t iCandidate = 0;
|
|---|
| 158 | TLorentzVector beamSpotPosition;
|
|---|
| 159 | Candidate *candidate, *mother;
|
|---|
| 160 | Double_t pt, eta, e, d0, d0Error, trueD0, dz, dzError, trueDZ, p, pError, trueP, ctgTheta, ctgThetaError, trueCtgTheta, phi, phiError, truePhi;
|
|---|
| 161 | Double_t x, y, z, t, px, py, pz, theta;
|
|---|
| 162 | Double_t q, r;
|
|---|
| 163 | Double_t x_c, y_c, r_c, phi_0;
|
|---|
| 164 | Double_t rcu, rc2, xd, yd, zd;
|
|---|
| 165 | const Double_t c_light = 2.99792458E8;
|
|---|
| 166 | TProfile2D *d0ErrorHist = NULL,
|
|---|
| 167 | *dzErrorHist = NULL,
|
|---|
| 168 | *pErrorHist = NULL,
|
|---|
| 169 | *ctgThetaErrorHist = NULL,
|
|---|
| 170 | *phiErrorHist = NULL;
|
|---|
| 171 |
|
|---|
| 172 | if(!fBeamSpotInputArray || fBeamSpotInputArray->GetSize() == 0)
|
|---|
| 173 | beamSpotPosition.SetXYZT(0.0, 0.0, 0.0, 0.0);
|
|---|
| 174 | else
|
|---|
| 175 | {
|
|---|
| 176 | Candidate &beamSpotCandidate = *((Candidate *)fBeamSpotInputArray->At(0));
|
|---|
| 177 | beamSpotPosition = beamSpotCandidate.Position;
|
|---|
| 178 | }
|
|---|
| 179 |
|
|---|
| 180 | if(!fUseD0Formula)
|
|---|
| 181 | {
|
|---|
| 182 | TFile *fin = TFile::Open(fD0ResolutionFile.c_str());
|
|---|
| 183 | d0ErrorHist = (TProfile2D *)fin->Get(fD0ResolutionHist.c_str());
|
|---|
| 184 | d0ErrorHist->SetDirectory(0);
|
|---|
| 185 | fin->Close();
|
|---|
| 186 | }
|
|---|
| 187 | if(!fUseDZFormula)
|
|---|
| 188 | {
|
|---|
| 189 | TFile *fin = TFile::Open(fDZResolutionFile.c_str());
|
|---|
| 190 | dzErrorHist = (TProfile2D *)fin->Get(fDZResolutionHist.c_str());
|
|---|
| 191 | dzErrorHist->SetDirectory(0);
|
|---|
| 192 | fin->Close();
|
|---|
| 193 | }
|
|---|
| 194 | if(!fUsePFormula)
|
|---|
| 195 | {
|
|---|
| 196 | TFile *fin = TFile::Open(fPResolutionFile.c_str());
|
|---|
| 197 | pErrorHist = (TProfile2D *)fin->Get(fPResolutionHist.c_str());
|
|---|
| 198 | pErrorHist->SetDirectory(0);
|
|---|
| 199 | fin->Close();
|
|---|
| 200 | }
|
|---|
| 201 | if(!fUseCtgThetaFormula)
|
|---|
| 202 | {
|
|---|
| 203 | TFile *fin = TFile::Open(fCtgThetaResolutionFile.c_str());
|
|---|
| 204 | ctgThetaErrorHist = (TProfile2D *)fin->Get(fCtgThetaResolutionHist.c_str());
|
|---|
| 205 | ctgThetaErrorHist->SetDirectory(0);
|
|---|
| 206 | fin->Close();
|
|---|
| 207 | }
|
|---|
| 208 | if(!fUsePhiFormula)
|
|---|
| 209 | {
|
|---|
| 210 | TFile *fin = TFile::Open(fPhiResolutionFile.c_str());
|
|---|
| 211 | phiErrorHist = (TProfile2D *)fin->Get(fPhiResolutionHist.c_str());
|
|---|
| 212 | phiErrorHist->SetDirectory(0);
|
|---|
| 213 | fin->Close();
|
|---|
| 214 | }
|
|---|
| 215 |
|
|---|
| 216 | fItInputArray->Reset();
|
|---|
| 217 | while((candidate = static_cast<Candidate *>(fItInputArray->Next())))
|
|---|
| 218 | {
|
|---|
| 219 |
|
|---|
| 220 | const TLorentzVector &momentum = candidate->Momentum;
|
|---|
| 221 | const TLorentzVector &position = candidate->InitialPosition;
|
|---|
| 222 |
|
|---|
| 223 | pt = momentum.Pt();
|
|---|
| 224 | eta = momentum.Eta();
|
|---|
| 225 | e = momentum.E();
|
|---|
| 226 |
|
|---|
| 227 | d0 = trueD0 = candidate->D0;
|
|---|
| 228 | dz = trueDZ = candidate->DZ;
|
|---|
| 229 |
|
|---|
| 230 | p = trueP = candidate->P;
|
|---|
| 231 | ctgTheta = trueCtgTheta = candidate->CtgTheta;
|
|---|
| 232 | phi = truePhi = candidate->Phi;
|
|---|
| 233 |
|
|---|
| 234 | if(fUseD0Formula)
|
|---|
| 235 | d0Error = fD0Formula->Eval(pt, eta, phi, e, candidate);
|
|---|
| 236 | else
|
|---|
| 237 | {
|
|---|
| 238 | Int_t xbin, ybin;
|
|---|
| 239 |
|
|---|
| 240 | xbin = pt < d0ErrorHist->GetXaxis()->GetXmax() ? d0ErrorHist->GetXaxis()->FindBin(pt) : d0ErrorHist->GetXaxis()->GetBinCenter(d0ErrorHist->GetXaxis()->GetNbins());
|
|---|
| 241 | ybin = d0ErrorHist->GetYaxis()->FindBin(TMath::Abs(eta));
|
|---|
| 242 | d0Error = d0ErrorHist->GetBinContent(xbin, ybin);
|
|---|
| 243 | if(!d0Error)
|
|---|
| 244 | d0Error = -1.0;
|
|---|
| 245 | }
|
|---|
| 246 | if(d0Error < 0.0)
|
|---|
| 247 | continue;
|
|---|
| 248 |
|
|---|
| 249 | if(fUseDZFormula)
|
|---|
| 250 | dzError = fDZFormula->Eval(pt, eta, phi, e, candidate);
|
|---|
| 251 | else
|
|---|
| 252 | {
|
|---|
| 253 | Int_t xbin, ybin;
|
|---|
| 254 |
|
|---|
| 255 | xbin = pt < dzErrorHist->GetXaxis()->GetXmax() ? dzErrorHist->GetXaxis()->FindBin(pt) : dzErrorHist->GetXaxis()->GetBinCenter(dzErrorHist->GetXaxis()->GetNbins());
|
|---|
| 256 | ybin = dzErrorHist->GetYaxis()->FindBin(TMath::Abs(eta));
|
|---|
| 257 | dzError = dzErrorHist->GetBinContent(xbin, ybin);
|
|---|
| 258 | if(!dzError)
|
|---|
| 259 | dzError = -1.0;
|
|---|
| 260 | }
|
|---|
| 261 | if(dzError < 0.0)
|
|---|
| 262 | continue;
|
|---|
| 263 |
|
|---|
| 264 | if(fUsePFormula)
|
|---|
| 265 | pError = fPFormula->Eval(pt, eta, phi, e, candidate) * p;
|
|---|
| 266 | else
|
|---|
| 267 | {
|
|---|
| 268 | Int_t xbin, ybin;
|
|---|
| 269 |
|
|---|
| 270 | xbin = pt < pErrorHist->GetXaxis()->GetXmax() ? pErrorHist->GetXaxis()->FindBin(pt) : pErrorHist->GetXaxis()->GetBinCenter(pErrorHist->GetXaxis()->GetNbins());
|
|---|
| 271 | ybin = pErrorHist->GetYaxis()->FindBin(TMath::Abs(eta));
|
|---|
| 272 | pError = pErrorHist->GetBinContent(xbin, ybin) * p;
|
|---|
| 273 | if(!pError)
|
|---|
| 274 | pError = -1.0;
|
|---|
| 275 | }
|
|---|
| 276 | if(pError < 0.0)
|
|---|
| 277 | continue;
|
|---|
| 278 |
|
|---|
| 279 | if(fUseCtgThetaFormula)
|
|---|
| 280 | ctgThetaError = fCtgThetaFormula->Eval(pt, eta, phi, e, candidate);
|
|---|
| 281 | else
|
|---|
| 282 | {
|
|---|
| 283 | Int_t xbin, ybin;
|
|---|
| 284 |
|
|---|
| 285 | xbin = pt < ctgThetaErrorHist->GetXaxis()->GetXmax() ? ctgThetaErrorHist->GetXaxis()->FindBin(pt) : ctgThetaErrorHist->GetXaxis()->GetBinCenter(ctgThetaErrorHist->GetXaxis()->GetNbins());
|
|---|
| 286 | ybin = ctgThetaErrorHist->GetYaxis()->FindBin(TMath::Abs(eta));
|
|---|
| 287 | ctgThetaError = ctgThetaErrorHist->GetBinContent(xbin, ybin);
|
|---|
| 288 | if(!ctgThetaError)
|
|---|
| 289 | ctgThetaError = -1.0;
|
|---|
| 290 | }
|
|---|
| 291 | if(ctgThetaError < 0.0)
|
|---|
| 292 | continue;
|
|---|
| 293 |
|
|---|
| 294 | if(fUsePhiFormula)
|
|---|
| 295 | phiError = fPhiFormula->Eval(pt, eta, phi, e, candidate);
|
|---|
| 296 | else
|
|---|
| 297 | {
|
|---|
| 298 | Int_t xbin, ybin;
|
|---|
| 299 |
|
|---|
| 300 | xbin = pt < phiErrorHist->GetXaxis()->GetXmax() ? phiErrorHist->GetXaxis()->FindBin(pt) : phiErrorHist->GetXaxis()->GetBinCenter(phiErrorHist->GetXaxis()->GetNbins());
|
|---|
| 301 | ybin = phiErrorHist->GetYaxis()->FindBin(TMath::Abs(eta));
|
|---|
| 302 | phiError = phiErrorHist->GetBinContent(xbin, ybin);
|
|---|
| 303 | if(!phiError)
|
|---|
| 304 | phiError = -1.0;
|
|---|
| 305 | }
|
|---|
| 306 | if(phiError < 0.0)
|
|---|
| 307 | continue;
|
|---|
| 308 |
|
|---|
| 309 | if(fApplyToPileUp || !candidate->IsPU)
|
|---|
| 310 | {
|
|---|
| 311 | d0 = gRandom->Gaus(d0, d0Error);
|
|---|
| 312 | dz = gRandom->Gaus(dz, dzError);
|
|---|
| 313 | p = gRandom->Gaus(p, pError);
|
|---|
| 314 | ctgTheta = gRandom->Gaus(ctgTheta, ctgThetaError);
|
|---|
| 315 | phi = gRandom->Gaus(phi, phiError);
|
|---|
| 316 | }
|
|---|
| 317 |
|
|---|
| 318 | if(p < 0.0) continue;
|
|---|
| 319 | while(phi > TMath::Pi()) phi -= TMath::TwoPi();
|
|---|
| 320 | while(phi <= -TMath::Pi()) phi += TMath::TwoPi();
|
|---|
| 321 |
|
|---|
| 322 | mother = candidate;
|
|---|
| 323 | candidate = static_cast<Candidate *>(candidate->Clone());
|
|---|
| 324 | candidate->D0 = d0;
|
|---|
| 325 | candidate->DZ = dz;
|
|---|
| 326 | candidate->P = p;
|
|---|
| 327 | candidate->CtgTheta = ctgTheta;
|
|---|
| 328 | candidate->Phi = phi;
|
|---|
| 329 |
|
|---|
| 330 | theta = TMath::ACos(ctgTheta / TMath::Sqrt(1.0 + ctgTheta * ctgTheta));
|
|---|
| 331 | candidate->Momentum.SetPx(p * TMath::Cos(phi) * TMath::Sin(theta));
|
|---|
| 332 | candidate->Momentum.SetPy(p * TMath::Sin(phi) * TMath::Sin(theta));
|
|---|
| 333 | candidate->Momentum.SetPz(p * TMath::Cos(theta));
|
|---|
| 334 | candidate->Momentum.SetE(candidate->Momentum.Pt() * TMath::CosH(eta));
|
|---|
| 335 | candidate->PT = candidate->Momentum.Pt();
|
|---|
| 336 |
|
|---|
| 337 | x = position.X();
|
|---|
| 338 | y = position.Y();
|
|---|
| 339 | z = position.Z();
|
|---|
| 340 | t = position.T();
|
|---|
| 341 | px = candidate->Momentum.Px();
|
|---|
| 342 | py = candidate->Momentum.Py();
|
|---|
| 343 | pz = candidate->Momentum.Pz();
|
|---|
| 344 | pt = candidate->Momentum.Pt();
|
|---|
| 345 |
|
|---|
| 346 | // -- solve for delta: d0' = ( (x+delta)*py' - (y+delta)*px' )/pt'
|
|---|
| 347 |
|
|---|
| 348 | candidate->InitialPosition.SetX(x + ((px * y - py * x + d0 * pt) / (py - px)));
|
|---|
| 349 | candidate->InitialPosition.SetY(y + ((px * y - py * x + d0 * pt) / (py - px)));
|
|---|
| 350 | x = candidate->InitialPosition.X();
|
|---|
| 351 | y = candidate->InitialPosition.Y();
|
|---|
| 352 | candidate->InitialPosition.SetZ(z + ((pz * (px * (x - beamSpotPosition.X()) + py * (y - beamSpotPosition.Y())) + pt * pt * (dz - z)) / (pt * pt)));
|
|---|
| 353 | z = candidate->InitialPosition.Z();
|
|---|
| 354 |
|
|---|
| 355 | candidate->InitialPosition.SetT(t);
|
|---|
| 356 |
|
|---|
| 357 | // update closest approach
|
|---|
| 358 | x *= 1.0E-3;
|
|---|
| 359 | y *= 1.0E-3;
|
|---|
| 360 | z *= 1.0E-3;
|
|---|
| 361 |
|
|---|
| 362 | q = candidate->Charge;
|
|---|
| 363 |
|
|---|
| 364 | r = pt / (q * fBz) * 1.0E9 / c_light; // in [m]
|
|---|
| 365 | phi_0 = TMath::ATan2(py, px); // [rad] in [-pi, pi]
|
|---|
| 366 |
|
|---|
| 367 | // 2. helix axis coordinates
|
|---|
| 368 | x_c = x + r * TMath::Sin(phi_0);
|
|---|
| 369 | y_c = y - r * TMath::Cos(phi_0);
|
|---|
| 370 | r_c = TMath::Hypot(x_c, y_c);
|
|---|
| 371 |
|
|---|
| 372 | rcu = TMath::Abs(r);
|
|---|
| 373 | rc2 = r_c * r_c;
|
|---|
| 374 |
|
|---|
| 375 | // calculate coordinates of closest approach to track circle in transverse plane xd, yd, zd
|
|---|
| 376 | xd = x_c * x_c * x_c - x_c * rcu * r_c + x_c * y_c * y_c;
|
|---|
| 377 | xd = (rc2 > 0.0) ? xd / rc2 : -999;
|
|---|
| 378 | yd = y_c * (-rcu * r_c + rc2);
|
|---|
| 379 | yd = (rc2 > 0.0) ? yd / rc2 : -999;
|
|---|
| 380 | zd = z + (TMath::Sqrt(xd * xd + yd * yd) - TMath::Sqrt(x * x + y * y)) * pz / pt;
|
|---|
| 381 |
|
|---|
| 382 | candidate->Xd = xd * 1.0E3;
|
|---|
| 383 | candidate->Yd = yd * 1.0E3;
|
|---|
| 384 | candidate->Zd = zd * 1.0E3;
|
|---|
| 385 |
|
|---|
| 386 | if(fApplyToPileUp || !candidate->IsPU)
|
|---|
| 387 | {
|
|---|
| 388 | candidate->ErrorD0 = d0Error;
|
|---|
| 389 | candidate->ErrorDZ = dzError;
|
|---|
| 390 | candidate->ErrorP = pError;
|
|---|
| 391 | candidate->ErrorCtgTheta = ctgThetaError;
|
|---|
| 392 | candidate->ErrorPhi = phiError;
|
|---|
| 393 | candidate->ErrorPT = ptError(p, ctgTheta, pError, ctgThetaError);
|
|---|
| 394 | candidate->TrackResolution = pError / p;
|
|---|
| 395 | }
|
|---|
| 396 |
|
|---|
| 397 | candidate->AddCandidate(mother);
|
|---|
| 398 | fOutputArray->Add(candidate);
|
|---|
| 399 |
|
|---|
| 400 | iCandidate++;
|
|---|
| 401 | }
|
|---|
| 402 | }
|
|---|
| 403 |
|
|---|
| 404 | Double_t TrackSmearing::ptError(const Double_t p, const Double_t ctgTheta, const Double_t dP, const Double_t dCtgTheta)
|
|---|
| 405 | {
|
|---|
| 406 | Double_t a, b;
|
|---|
| 407 | a = (p * p * ctgTheta * ctgTheta * dCtgTheta * dCtgTheta) / ((ctgTheta * ctgTheta + 1) * (ctgTheta * ctgTheta + 1) * (ctgTheta * ctgTheta + 1));
|
|---|
| 408 | b = (dP * dP) / (ctgTheta * ctgTheta + 1);
|
|---|
| 409 | return sqrt(a + b);
|
|---|
| 410 | }
|
|---|
| 411 |
|
|---|
| 412 | //------------------------------------------------------------------------------
|
|---|
