pat::helper::ParametrizationHelper Namespace Reference

Functions
AlgebraicVector4	diffToParameters (pat::CandKinResolution::Parametrization parametrization, const math::PtEtaPhiMLorentzVector &p4ini, const math::PtEtaPhiMLorentzVector &p4fin)
	Expresses the difference between two 4-momentum vectors as a shift in coordinates in a given frame. More...
AlgebraicVector4	diffToParameters (pat::CandKinResolution::Parametrization parametrization, const math::XYZTLorentzVector &p4ini, const math::XYZTLorentzVector &p4fin)
	Expresses the difference between two 4-momentum vectors as a shift in coordinates in a given frame. More...
uint32_t	dimension (pat::CandKinResolution::Parametrization parametrization)
	Returns the number of free parameters in a parametrization (3 or 4) More...
pat::CandKinResolution::Parametrization	fromString (const std::string &name)
	Convert a name into a parametrization code. More...
bool	isAlwaysMassive (pat::CandKinResolution::Parametrization parametrization)
	Is this parametrization usable only with massive objects? More...
bool	isAlwaysMassless (pat::CandKinResolution::Parametrization parametrization)
	Is this parametrization usable only with massless objects? More...
bool	isMassConstrained (pat::CandKinResolution::Parametrization parametrization)
	If this parametrization has a mass constraint (including the 'isAlwaysMassless' case) More...
bool	isPhysical (pat::CandKinResolution::Parametrization parametrization, const AlgebraicVector4 &v4, const math::PtEtaPhiMLorentzVector &initialP4)
const char *	name (pat::CandKinResolution::Parametrization param)
	Convert a number into a string. More...
math::XYZTLorentzVector	p4fromParameters (pat::CandKinResolution::Parametrization parametrization, const AlgebraicVector4 &parameters, const math::XYZTLorentzVector &initialP4)
AlgebraicVector4	parametersFromP4 (pat::CandKinResolution::Parametrization parametrization, const math::PtEtaPhiMLorentzVector &p4)
	Returns a vector of coordinates values given a coordinate frame and a 4-vector. More...
AlgebraicVector4	parametersFromP4 (pat::CandKinResolution::Parametrization parametrization, const math::XYZTLorentzVector &p4)
	Returns a vector of coordinates values given a coordinate frame and a 4-vector. More...
math::PtEtaPhiMLorentzVector	polarP4fromParameters (pat::CandKinResolution::Parametrization parametrization, const AlgebraicVector4 &parameters, const math::PtEtaPhiMLorentzVector &initialP4)
template<typename T >
void	setParametersFromAnyVector (pat::CandKinResolution::Parametrization parametrization, AlgebraicVector4 &pars, const T &p4)
	For internal use only, so we provide only the interface. Use the 'setParametersFromP4'. More...
void	setParametersFromP4 (pat::CandKinResolution::Parametrization parametrization, AlgebraicVector4 &pars, const math::PtEtaPhiMLorentzVector &p4)
	Set the values of the parameters for a given 4-momentum. More...
void	setParametersFromP4 (pat::CandKinResolution::Parametrization parametrization, AlgebraicVector4 &pars, const math::XYZTLorentzVector &p4)
	Set the values of the parameters for a given 4-momentum. More...

Function Documentation

diffToParameters() [1/2]

AlgebraicVector4 pat::helper::ParametrizationHelper::diffToParameters	(	pat::CandKinResolution::Parametrization	parametrization,
		const math::PtEtaPhiMLorentzVector &	p4ini,
		const math::PtEtaPhiMLorentzVector &	p4fin
	)

Expresses the difference between two 4-momentum vectors as a shift in coordinates in a given frame.

Basically, if you do: pars = parametersFromP4(param, simp4); diff = diffToParameters(param, simP4, recP4); then up to roundoff errors recP4 == p4fromParameters(param, pars+diff, simP4);

Definition at line 329 of file ParametrizationHelper.cc.

                                             {
  AlgebraicVector4 ret;
  switch (parametrization) {
    case pat::CandKinResolution::Cart:
    case pat::CandKinResolution::ECart:
    case pat::CandKinResolution::MCCart:
      ret = parametersFromP4(parametrization, p4fin) - parametersFromP4(parametrization, p4ini);
      break;
    case pat::CandKinResolution::Spher:
    case pat::CandKinResolution::ESpher:
    case pat::CandKinResolution::MCSpher:
    case pat::CandKinResolution::MCPInvSpher:
    case pat::CandKinResolution::EtThetaPhi:
    case pat::CandKinResolution::EtEtaPhi:
      ret = parametersFromP4(parametrization, p4fin) - parametersFromP4(parametrization, p4ini);
      while (ret[2] > +M_PI)
        ret[2] -= (2 * M_PI);
      while (ret[2] < -M_PI)
        ret[2] += (2 * M_PI);
      break;
    case pat::CandKinResolution::MCMomDev:
    case pat::CandKinResolution::MomDev:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::EScaledMomDev:
      return diffToParameters(parametrization, math::XYZTLorentzVector(p4ini), math::XYZTLorentzVector(p4fin));
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "diffToParameters not yet implemented for parametrization " << parametrization;
  }
  return ret;
}

References pat::CandKinResolution::Cart, diffToParameters(), pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, M_PI, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, parametersFromP4(), stringResolutionProvider_cfi::parametrization, runTheMatrix::ret, and pat::CandKinResolution::Spher.

diffToParameters() [2/2]

AlgebraicVector4 pat::helper::ParametrizationHelper::diffToParameters	(	pat::CandKinResolution::Parametrization	parametrization,
		const math::XYZTLorentzVector &	p4ini,
		const math::XYZTLorentzVector &	p4fin
	)

Expresses the difference between two 4-momentum vectors as a shift in coordinates in a given frame.

Basically, if you do: pars = parametersFromP4(param, simp4); diff = diffToParameters(param, simP4, recP4); then up to roundoff errors recP4 == p4fromParameters(param, pars+diff, simP4);

Definition at line 366 of file ParametrizationHelper.cc.

                                        {
  AlgebraicVector4 ret;
  switch (parametrization) {
    case pat::CandKinResolution::Cart:
    case pat::CandKinResolution::ECart:
    case pat::CandKinResolution::MCCart:
    case pat::CandKinResolution::Spher:
      ret = parametersFromP4(parametrization, p4fin) - parametersFromP4(parametrization, p4ini);
      break;
    case pat::CandKinResolution::ESpher:
    case pat::CandKinResolution::MCSpher:
    case pat::CandKinResolution::MCPInvSpher:
    case pat::CandKinResolution::EtThetaPhi:
    case pat::CandKinResolution::EtEtaPhi:
      ret = parametersFromP4(parametrization, p4fin) - parametersFromP4(parametrization, p4ini);
      while (ret[2] > +M_PI)
        ret[2] -= (2 * M_PI);
      while (ret[2] < -M_PI)
        ret[2] += (2 * M_PI);
      break;
    case pat::CandKinResolution::MCMomDev:
    case pat::CandKinResolution::MomDev:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::EScaledMomDev: {
      typedef ROOT::Math::DisplacementVector3D<ROOT::Math::Cartesian3D<double> > V3Cart;
      V3Cart p1 = p4ini.Vect(), p2 = p4fin.Vect();
      V3Cart ur = p1.Unit();
      V3Cart uz(0, 0, 1);
      V3Cart uph = uz.Cross(ur).Unit();
      V3Cart uth = ur.Cross(uph).Unit();
      ret[0] = p2.Dot(ur) / p1.R() - 1.0;
      ret[1] = (p2 - p1).Dot(uth);
      ret[2] = (p2 - p1).Dot(uph);
      if (parametrization == pat::CandKinResolution::MomDev) {
        ret[3] = p4fin.mass() / p4ini.mass() - 1.0;
      } else if (parametrization == pat::CandKinResolution::EMomDev) {
        ret[3] = p4fin.energy() / p4ini.energy() - 1.0;
      }
    } break;
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "diffToParameters not yet implemented for parametrization " << parametrization;
  }
  return ret;
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, M_PI, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, p1, p2, parametersFromP4(), stringResolutionProvider_cfi::parametrization, runTheMatrix::ret, and pat::CandKinResolution::Spher.

Referenced by diffToParameters().

dimension()

uint32_t pat::helper::ParametrizationHelper::dimension ( pat::CandKinResolution::Parametrization  parametrization )

inline

Returns the number of free parameters in a parametrization (3 or 4)

Definition at line 12 of file ParametrizationHelper.h.

                                                                                     {
        return (static_cast<uint32_t>(parametrization) & 0x0F);
      }

References stringResolutionProvider_cfi::parametrization.

Referenced by FKDTree< TYPE, numberOfDimensions >::build(), MillePedeAlignmentAlgorithm::callMille2D(), CosmicMuonSeedGenerator::createSeed(), SETSeedFinder::estimateMomentum(), pat::CandKinResolution::fillMatrixFrom(), pat::CandKinResolution::fillVector(), NoisyChannel::getAverage(), FKDTree< TYPE, numberOfDimensions >::intersects(), Trajectory::ndof(), SETSeedFinder::pre_prune(), BaseMVAValueMapProducer< pat::Jet >::produce(), FKDTree< TYPE, numberOfDimensions >::search(), and TMultiDimFet::TMultiDimFet().

fromString()

pat::CandKinResolution::Parametrization pat::helper::ParametrizationHelper::fromString

(

const std::string &

name

)

Convert a name into a parametrization code.

Definition at line 14 of file ParametrizationHelper.cc.

                                                                                                    {
  using namespace std;
 
  typedef pat::CandKinResolution::Parametrization Parametrization;
 
  static map<string, Parametrization> const parMaps = {{"Cart", pat::CandKinResolution::Cart},
                                                       {"ECart", pat::CandKinResolution::ECart},
                                                       {"MCCart", pat::CandKinResolution::MCCart},
                                                       {"Spher", pat::CandKinResolution::Spher},
                                                       {"ESpher", pat::CandKinResolution::ESpher},
                                                       {"MCSpher", pat::CandKinResolution::MCSpher},
                                                       {"MCPInvSpher", pat::CandKinResolution::MCPInvSpher},
                                                       {"EtEtaPhi", pat::CandKinResolution::EtEtaPhi},
                                                       {"EtThetaPhi", pat::CandKinResolution::EtThetaPhi},
                                                       {"MomDev", pat::CandKinResolution::MomDev},
                                                       {"EMomDev", pat::CandKinResolution::EMomDev},
                                                       {"MCMomDev", pat::CandKinResolution::MCMomDev},
                                                       {"EScaledMomDev", pat::CandKinResolution::EScaledMomDev}};
  map<string, Parametrization>::const_iterator itP = parMaps.find(name);
  if (itP == parMaps.end()) {
    throw cms::Exception("StringResolutionProvider") << "Bad parametrization '" << name.c_str() << "'";
  }
  return itP->second;
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, Skims_PA_cff::name, and pat::CandKinResolution::Spher.

Referenced by StringResolutionProvider::StringResolutionProvider().

isAlwaysMassive()

bool pat::helper::ParametrizationHelper::isAlwaysMassive

(

pat::CandKinResolution::Parametrization

parametrization

)

Is this parametrization usable only with massive objects?

Definition at line 442 of file ParametrizationHelper.cc.

                                                                                                        {
  switch (parametrization) {
    case pat::CandKinResolution::Cart:
    case pat::CandKinResolution::ECart:
    case pat::CandKinResolution::MCCart:
    case pat::CandKinResolution::Spher:
    case pat::CandKinResolution::ESpher:
    case pat::CandKinResolution::MCSpher:
    case pat::CandKinResolution::MCPInvSpher:
    case pat::CandKinResolution::MCMomDev:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::EScaledMomDev:
    case pat::CandKinResolution::EtThetaPhi:
    case pat::CandKinResolution::EtEtaPhi:
      return false;
    case pat::CandKinResolution::MomDev:
      return true;
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "isAlwaysMassless not yet implemented for parametrization " << parametrization;
  }
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, stringResolutionProvider_cfi::parametrization, and pat::CandKinResolution::Spher.

isAlwaysMassless()

bool pat::helper::ParametrizationHelper::isAlwaysMassless

(

pat::CandKinResolution::Parametrization

parametrization

)

Is this parametrization usable only with massless objects?

Definition at line 417 of file ParametrizationHelper.cc.

                                                                                                         {
  switch (parametrization) {
    case pat::CandKinResolution::Cart:
    case pat::CandKinResolution::ECart:
    case pat::CandKinResolution::MCCart:
    case pat::CandKinResolution::Spher:
    case pat::CandKinResolution::ESpher:
    case pat::CandKinResolution::MCSpher:
    case pat::CandKinResolution::MCPInvSpher:
    case pat::CandKinResolution::MCMomDev:
    case pat::CandKinResolution::MomDev:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::EScaledMomDev:
      return false;
    case pat::CandKinResolution::EtThetaPhi:
    case pat::CandKinResolution::EtEtaPhi:
      return true;
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "isAlwaysMassless not yet implemented for parametrization " << parametrization;
  }
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, stringResolutionProvider_cfi::parametrization, and pat::CandKinResolution::Spher.

isMassConstrained()

bool pat::helper::ParametrizationHelper::isMassConstrained

(

pat::CandKinResolution::Parametrization

parametrization

)

If this parametrization has a mass constraint (including the 'isAlwaysMassless' case)

Definition at line 467 of file ParametrizationHelper.cc.

                                                                                                          {
  switch (parametrization) {
    case pat::CandKinResolution::Cart:
    case pat::CandKinResolution::ECart:
    case pat::CandKinResolution::Spher:
    case pat::CandKinResolution::ESpher:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::EScaledMomDev:
    case pat::CandKinResolution::EtThetaPhi:
    case pat::CandKinResolution::EtEtaPhi:
    case pat::CandKinResolution::MomDev:
      return false;
    case pat::CandKinResolution::MCCart:
    case pat::CandKinResolution::MCSpher:
    case pat::CandKinResolution::MCPInvSpher:
    case pat::CandKinResolution::MCMomDev:
      return true;
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "isAlwaysMassless not yet implemented for parametrization " << parametrization;
  }
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, stringResolutionProvider_cfi::parametrization, and pat::CandKinResolution::Spher.

isPhysical()

bool pat::helper::ParametrizationHelper::isPhysical	(	pat::CandKinResolution::Parametrization	parametrization,
		const AlgebraicVector4 &	v4,
		const math::PtEtaPhiMLorentzVector &	initialP4
	)

If this value of the parameters is meaningful in this parametrization. It can be used e.g. when doing random smearing to check you're still within the physical region This DOES check inequalities (e.g. E >= P, M >= 0, theta in [0,PI], ..) This DOES NOT check strict equalities (e.g. M == 0) This DOES NOT check that your parameters comply with your constraints (e.g. fixed mass constraint)

Definition at line 492 of file ParametrizationHelper.cc.

                                                                                                 {
  switch (parametrization) {
    // ======= CARTESIAN ==========
    case pat::CandKinResolution::Cart:
      return parameters[3] >= 0;  // M >= 0
    case pat::CandKinResolution::MCCart:
      return true;
    case pat::CandKinResolution::ECart:
      return (parameters[0] * parameters[0] + parameters[1] * parameters[1] + parameters[2] * parameters[2] <=
              parameters[3] * parameters[3]);  // E >= P
    case pat::CandKinResolution::Spher:
      return (parameters[0] >= 0) &&   // P >= 0
             (parameters[3] >= 0) &&   // M >= 0
             (parameters[1] >= 0) &&   // theta >= 0
             (parameters[1] <= M_PI);  // theta <= pi
    case pat::CandKinResolution::MCSpher:
      return (parameters[0] >= 0) &&              // P >= 0
             (parameters[1] >= 0) &&              // theta >= 0
             (parameters[1] <= M_PI);             // theta <= pi
    case pat::CandKinResolution::ESpher:          //
      return (parameters[0] >= 0) &&              // P >= 0
             (parameters[3] >= parameters[0]) &&  // E >= P
             (parameters[1] >= 0) &&              // theta >= 0
             (parameters[1] <= M_PI);             // theta <= PI
    case pat::CandKinResolution::MCPInvSpher:     //
      return (parameters[0] > 0) &&               // 1/P > 0
             (parameters[1] >= 0) &&              // theta >= 0
             (parameters[1] <= M_PI);             // theta <= pi
    // ======= HEP CYLINDRICAL ==========
    case pat::CandKinResolution::EtThetaPhi:
      return (parameters[0] > 0) &&         // Et >= 0
             (parameters[1] >= 0) &&        // theta >= 0
             (parameters[1] <= M_PI);       // theta <= pi
    case pat::CandKinResolution::EtEtaPhi:  // as simple as that
      return (parameters[0] > 0);           // Et >= 0
    // ======= MomentumDeviates ==========
    case pat::CandKinResolution::MomDev:
      return (parameters[0] >= 0) &&  // P >= 0
             (parameters[3] >= 0);    // m/M0 >= 0
    case pat::CandKinResolution::MCMomDev:
      return (parameters[0] >= 0);  // P >= 0
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::EScaledMomDev: {
      if (parameters[0] <= 0)
        return false;
      ROOT::Math::DisplacementVector3D<ROOT::Math::Cartesian3D<double> > p = initialP4.Vect(), uz(0, 0, 1), uph, uth;
      uph = uz.Cross(p).Unit();
      uth = p.Cross(uph).Unit();
      p *= parameters[0];
      p += uth * parameters[1] + uph * parameters[2];
      if (parametrization == pat::CandKinResolution::EMomDev) {
        if (parameters[3] < 0)
          return false;
        double m2 = ROOT::Math::Square(parameters[3] * initialP4.energy()) - p.Mag2();
        if (m2 < 0)
          return false;
      } else if (parametrization == pat::CandKinResolution::EScaledMomDev) {
        if (parameters[3] < 0)
          return false;
        double m2 = ROOT::Math::Square(p.R() * initialP4.E() / initialP4.P()) - p.Mag2();
        if (m2 < 0)
          return false;
      }
      return true;
    }
    // ======= OTHER ==========
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "getResolEta not yet implemented for parametrization " << parametrization;
  }
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, M_PI, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, AlCaHLTBitMon_ParallelJobs::p, stringResolutionProvider_cfi::parametrization, pat::CandKinResolution::Spher, and HGCalGeometryMode::Square.

name()

const char * pat::helper::ParametrizationHelper::name

(

pat::CandKinResolution::Parametrization

param

)

Convert a number into a string.

Definition at line 39 of file ParametrizationHelper.cc.

                                                                                          {
  switch (param) {
    case pat::CandKinResolution::Cart:
      return "Cart";
    case pat::CandKinResolution::ECart:
      return "ECart";
    case pat::CandKinResolution::MCCart:
      return "MCCart";
    case pat::CandKinResolution::Spher:
      return "Spher";
    case pat::CandKinResolution::ESpher:
      return "ESpher";
    case pat::CandKinResolution::MCSpher:
      return "MCSpher";
    case pat::CandKinResolution::MCPInvSpher:
      return "MCPInvSpher";
    case pat::CandKinResolution::EtEtaPhi:
      return "EtEtaPhi";
    case pat::CandKinResolution::EtThetaPhi:
      return "EtThetaPhi";
    case pat::CandKinResolution::MomDev:
      return "MomDev";
    case pat::CandKinResolution::EMomDev:
      return "EMomDev";
    case pat::CandKinResolution::MCMomDev:
      return "MCMomDev";
    case pat::CandKinResolution::EScaledMomDev:
      return "EScaledMomDev";
    case pat::CandKinResolution::Invalid:
      return "Invalid";
    default:
      return "UNKNOWN";
  }
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, pat::CandKinResolution::Invalid, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, and pat::CandKinResolution::Spher.

p4fromParameters()

math::XYZTLorentzVector pat::helper::ParametrizationHelper::p4fromParameters	(	pat::CandKinResolution::Parametrization	parametrization,
		const AlgebraicVector4 &	parameters,
		const math::XYZTLorentzVector &	initialP4
	)

Given a choice of coordinate frame, a vector of coordinates and a reference 4-vector, produce a new 4 vector with the specified parameters. The new 4-vector is not guaranteed to satisfy the constraints of these parametrization if the initial 4-vector does not satisfy them. In the future this method will throw an exception if you go in an unphysical point of the coordinate system (e.g. E^2 < P^2)

Definition at line 161 of file ParametrizationHelper.cc.

                                            {
  math::XYZTLorentzVector ret;
  switch (parametrization) {
    // ======= CARTESIAN ==========
    case pat::CandKinResolution::Cart:
      ret.SetCoordinates(parameters[0],
                         parameters[1],
                         parameters[2],
                         sqrt(parameters[0] * parameters[0] + parameters[1] * parameters[1] +
                              parameters[2] * parameters[2] + parameters[3] * parameters[3]));
      break;
    case pat::CandKinResolution::MCCart:  // same as above
      ret.SetCoordinates(parameters[0],
                         parameters[1],
                         parameters[2],
                         sqrt(parameters[0] * parameters[0] + parameters[1] * parameters[1] +
                              parameters[2] * parameters[2] + initialP4.mass() * initialP4.mass()));
      break;
    case pat::CandKinResolution::ECart:
      ret.SetCoordinates(parameters[0], parameters[1], parameters[2], parameters[3]);
      break;
    // ======= MomentumDeviates ==========
    case pat::CandKinResolution::MomDev:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::MCMomDev:
    case pat::CandKinResolution::EScaledMomDev: {
      ROOT::Math::DisplacementVector3D<ROOT::Math::Cartesian3D<double> > p = initialP4.Vect(), uz(0, 0, 1), uph, uth;
      uph = uz.Cross(p).Unit();
      uth = p.Cross(uph).Unit();
      p *= parameters[0];
      p += uth * parameters[1] + uph * parameters[2];
      if (parametrization == pat::CandKinResolution::MomDev) {
        ret.SetCoordinates(p.X(), p.Y(), p.Z(), sqrt(p.Mag2() + ROOT::Math::Square(initialP4.mass() * parameters[3])));
      } else if (parametrization == pat::CandKinResolution::EMomDev) {
        ret.SetCoordinates(p.X(), p.Y(), p.Z(), parameters[3] * initialP4.energy());
      } else if (parametrization == pat::CandKinResolution::EMomDev) {
        ret.SetCoordinates(p.X(), p.Y(), p.Z(), p.R() * initialP4.E() / initialP4.P());
      } else {
        ret.SetCoordinates(p.X(), p.Y(), p.Z(), sqrt(p.Mag2() + initialP4.mass() * initialP4.mass()));
      }
      break;
    }
    // ======= ALL OTHERS ==========
    default:
      ret = polarP4fromParameters(parametrization, parameters, math::PtEtaPhiMLorentzVector(initialP4));
  }
  return ret;
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MomDev, AlCaHLTBitMon_ParallelJobs::p, stringResolutionProvider_cfi::parametrization, polarP4fromParameters(), runTheMatrix::ret, mathSSE::sqrt(), and HGCalGeometryMode::Square.

parametersFromP4() [1/2]

AlgebraicVector4 pat::helper::ParametrizationHelper::parametersFromP4	(	pat::CandKinResolution::Parametrization	parametrization,
		const math::PtEtaPhiMLorentzVector &	p4
	)

Returns a vector of coordinates values given a coordinate frame and a 4-vector.

Definition at line 315 of file ParametrizationHelper.cc.

                                                                                               {
  AlgebraicVector4 ret;
  setParametersFromP4(parametrization, ret, p4);
  return ret;
}

References p4, stringResolutionProvider_cfi::parametrization, runTheMatrix::ret, and setParametersFromP4().

parametersFromP4() [2/2]

AlgebraicVector4 pat::helper::ParametrizationHelper::parametersFromP4	(	pat::CandKinResolution::Parametrization	parametrization,
		const math::XYZTLorentzVector &	p4
	)

Returns a vector of coordinates values given a coordinate frame and a 4-vector.

Definition at line 322 of file ParametrizationHelper.cc.

                                                                                          {
  AlgebraicVector4 ret;
  setParametersFromP4(parametrization, ret, p4);
  return ret;
}

References p4, stringResolutionProvider_cfi::parametrization, runTheMatrix::ret, and setParametersFromP4().

Referenced by diffToParameters().

polarP4fromParameters()

math::PtEtaPhiMLorentzVector pat::helper::ParametrizationHelper::polarP4fromParameters	(	pat::CandKinResolution::Parametrization	parametrization,
		const AlgebraicVector4 &	parameters,
		const math::PtEtaPhiMLorentzVector &	initialP4
	)

Given a choice of coordinate frame, a vector of coordinates and a reference 4-vector, produce a new 4 vector with the specified parameters. The new 4-vector is not guaranteed to satisfy the constraints of these parametrization if the initial 4-vector does not satisfy them. In the future this method will throw an exception if you go in an unphysical point of the coordinate system (e.g. E^2 < P^2)

Definition at line 74 of file ParametrizationHelper.cc.

                                                 {
  math::PtEtaPhiMLorentzVector ret;
  ROOT::Math::CylindricalEta3D<double> converter;
  double m2;
  switch (parametrization) {
    // ======= CARTESIAN ==========
    case pat::CandKinResolution::Cart:
      ret = math::XYZTLorentzVector(parameters[0],
                                    parameters[1],
                                    parameters[2],
                                    sqrt(parameters[0] * parameters[0] + parameters[1] * parameters[1] +
                                         parameters[2] * parameters[2] + parameters[3] * parameters[3]));
      ret.SetM(parameters[3]);  // to be sure about roundoffs
      break;
    case pat::CandKinResolution::MCCart:
      ret = math::XYZTLorentzVector(parameters[0],
                                    parameters[1],
                                    parameters[2],
                                    sqrt(parameters[0] * parameters[0] + parameters[1] * parameters[1] +
                                         parameters[2] * parameters[2] + initialP4.mass() * initialP4.mass()));
      ret.SetM(initialP4.mass());  // to be sure about roundoffs
      break;
    case pat::CandKinResolution::ECart:
      ret = math::XYZTLorentzVector(parameters[0], parameters[1], parameters[2], parameters[3]);
      break;
    // ======= SPHERICAL ==========
    case pat::CandKinResolution::Spher:
      converter = ROOT::Math::Polar3D<double>(parameters[0], parameters[1], 0);
      ret.SetCoordinates(converter.Rho(), converter.Eta(), parameters[2], parameters[3]);
      break;
    case pat::CandKinResolution::MCSpher:  // same as above
      converter = ROOT::Math::Polar3D<double>(parameters[0], parameters[1], 0);
      ret.SetCoordinates(converter.Rho(), converter.Eta(), parameters[2], initialP4.mass());
      break;
    case pat::CandKinResolution::ESpher:  //
      converter = ROOT::Math::Polar3D<double>(parameters[0], parameters[1], 0);
      m2 = -parameters[0] * parameters[0] + parameters[3] * parameters[3];
      ret.SetCoordinates(converter.Rho(), converter.Eta(), parameters[2], (m2 > 0 ? sqrt(m2) : 0.0));
      break;
    case pat::CandKinResolution::MCPInvSpher:  //
      converter = ROOT::Math::Polar3D<double>(1.0 / parameters[0], parameters[1], 0);
      ret.SetCoordinates(converter.Rho(), converter.Eta(), parameters[2], initialP4.mass());
      break;
    // ======= HEP CYLINDRICAL ==========
    case pat::CandKinResolution::EtThetaPhi:
      converter = ROOT::Math::Polar3D<double>(1.0, parameters[1], 0);
      ret.SetCoordinates(parameters[0], converter.Eta(), parameters[2], 0);
      break;
    case pat::CandKinResolution::EtEtaPhi:  // as simple as that
      ret.SetCoordinates(parameters[0], parameters[1], parameters[2], 0);
      break;
    // ======= MomentumDeviates ==========
    case pat::CandKinResolution::MomDev:
    case pat::CandKinResolution::EMomDev:
    case pat::CandKinResolution::MCMomDev:
    case pat::CandKinResolution::EScaledMomDev: {
      ROOT::Math::DisplacementVector3D<ROOT::Math::Cartesian3D<double> > p = initialP4.Vect(), uz(0, 0, 1), uph, uth;
      uph = uz.Cross(p).Unit();
      uth = p.Cross(uph).Unit();
      p *= parameters[0];
      p += uth * parameters[1] + uph * parameters[2];
      if (parametrization == pat::CandKinResolution::MomDev) {
        ret.SetCoordinates(p.Rho(), p.Eta(), p.Phi(), initialP4.mass() * parameters[3]);
      } else if (parametrization == pat::CandKinResolution::EMomDev) {
        double m2 = ROOT::Math::Square(parameters[3] * initialP4.energy()) - p.Mag2();
        ret.SetCoordinates(p.Rho(), p.Eta(), p.Phi(), (m2 > 0 ? sqrt(m2) : 0.0));
      } else if (parametrization == pat::CandKinResolution::EScaledMomDev) {
        double m2 = ROOT::Math::Square(p.R() * initialP4.E() / initialP4.P()) - p.Mag2();
        ret.SetCoordinates(p.Rho(), p.Eta(), p.Phi(), (m2 > 0 ? sqrt(m2) : 0.0));
      } else if (parametrization == pat::CandKinResolution::MCMomDev) {
        ret.SetCoordinates(p.Rho(), p.Eta(), p.Phi(), initialP4.mass());
      }
      break;
    }
    // ======= OTHER ==========
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "getResolEta not yet implemented for parametrization " << parametrization;
  }
  return ret;
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, AlCaHLTBitMon_ParallelJobs::p, stringResolutionProvider_cfi::parametrization, runTheMatrix::ret, pat::CandKinResolution::Spher, mathSSE::sqrt(), and HGCalGeometryMode::Square.

Referenced by p4fromParameters().

setParametersFromAnyVector()

template<typename T >

void pat::helper::ParametrizationHelper::setParametersFromAnyVector	(	pat::CandKinResolution::Parametrization	parametrization,
		AlgebraicVector4 &	pars,
		const T &	p4
	)

For internal use only, so we provide only the interface. Use the 'setParametersFromP4'.

Definition at line 214 of file ParametrizationHelper.cc.

                                                                                             {
  switch (parametrization) {
    // ======= CARTESIAN ==========
    case pat::CandKinResolution::Cart:
      ret[0] = p4.px();
      ret[1] = p4.py();
      ret[2] = p4.pz();
      ret[3] = p4.mass();
      break;
    case pat::CandKinResolution::MCCart:
      ret[0] = p4.px();
      ret[1] = p4.py();
      ret[2] = p4.pz();
      ret[3] = p4.mass();
      break;
    case pat::CandKinResolution::ECart:
      ret[0] = p4.px();
      ret[1] = p4.py();
      ret[2] = p4.pz();
      ret[3] = p4.energy();
      break;
      // ======= SPHERICAL ==========
    case pat::CandKinResolution::Spher:
      ret[0] = p4.P();
      ret[1] = p4.theta();
      ret[2] = p4.phi();
      ret[3] = p4.mass();
      break;
    case pat::CandKinResolution::MCSpher:
      ret[0] = p4.P();
      ret[1] = p4.theta();
      ret[2] = p4.phi();
      ret[3] = p4.mass();
      break;
    case pat::CandKinResolution::ESpher:
      ret[0] = p4.P();
      ret[1] = p4.theta();
      ret[2] = p4.phi();
      ret[3] = p4.energy();
      break;
    case pat::CandKinResolution::MCPInvSpher:
      ret[0] = 1.0 / p4.P();
      ret[1] = p4.theta();
      ret[2] = p4.phi();
      ret[3] = p4.mass();
      break;
    // ======= HEP CYLINDRICAL ==========
    case pat::CandKinResolution::EtThetaPhi:
      ret[0] = p4.pt();
      ret[1] = p4.theta();
      ret[2] = p4.phi();
      ret[3] = 0;
      break;
    case pat::CandKinResolution::EtEtaPhi:
      ret[0] = p4.pt();
      ret[1] = p4.eta();
      ret[2] = p4.phi();
      ret[3] = 0;
      break;
    // ======= DEVIATES ==========
    case pat::CandKinResolution::MomDev:
    case pat::CandKinResolution::EMomDev:
      ret[0] = 1.0;
      ret[1] = 0.0;
      ret[2] = 0.0;
      ret[3] = 1.0;
      break;
    case pat::CandKinResolution::MCMomDev:
      ret[0] = 1.0;
      ret[1] = 0.0;
      ret[2] = 0.0;
      ret[3] = p4.mass();
      break;
    case pat::CandKinResolution::EScaledMomDev:
      ret[0] = 1.0;
      ret[1] = 0.0;
      ret[2] = 0.0;
      ret[3] = p4.E() / p4.P();
      break;
    // ======= OTHER ==========
    case pat::CandKinResolution::Invalid:
      throw cms::Exception("Invalid parametrization") << parametrization;
    default:
      throw cms::Exception("Not Implemented")
          << "getResolEta not yet implemented for parametrization " << parametrization;
  }
}

References pat::CandKinResolution::Cart, pat::CandKinResolution::ECart, pat::CandKinResolution::EMomDev, pat::CandKinResolution::EScaledMomDev, pat::CandKinResolution::ESpher, pat::CandKinResolution::EtEtaPhi, pat::CandKinResolution::EtThetaPhi, Exception, pat::CandKinResolution::Invalid, pat::CandKinResolution::MCCart, pat::CandKinResolution::MCMomDev, pat::CandKinResolution::MCPInvSpher, pat::CandKinResolution::MCSpher, pat::CandKinResolution::MomDev, p4, stringResolutionProvider_cfi::parametrization, runTheMatrix::ret, and pat::CandKinResolution::Spher.

Referenced by setParametersFromP4().

setParametersFromP4() [1/2]

void pat::helper::ParametrizationHelper::setParametersFromP4	(	pat::CandKinResolution::Parametrization	parametrization,
		AlgebraicVector4 &	pars,
		const math::PtEtaPhiMLorentzVector &	p4
	)

Set the values of the parameters for a given 4-momentum.

Definition at line 303 of file ParametrizationHelper.cc.

                                                                                                   {
  setParametersFromAnyVector(parametrization, v, p4);
}

References p4, stringResolutionProvider_cfi::parametrization, setParametersFromAnyVector(), and findQualityFiles::v.

setParametersFromP4() [2/2]

void pat::helper::ParametrizationHelper::setParametersFromP4	(	pat::CandKinResolution::Parametrization	parametrization,
		AlgebraicVector4 &	pars,
		const math::XYZTLorentzVector &	p4
	)

Set the values of the parameters for a given 4-momentum.

Definition at line 309 of file ParametrizationHelper.cc.

                                                                                              {
  setParametersFromAnyVector(parametrization, v, p4);
}

References p4, stringResolutionProvider_cfi::parametrization, setParametersFromAnyVector(), and findQualityFiles::v.

Referenced by parametersFromP4().