#include <SimpleSecondaryVertexComputer.h>

Inheritance diagram for SimpleSecondaryVertexComputer:

Public Member Functions
float	discriminator (const TagInfoHelper &tagInfos) const
	SimpleSecondaryVertexComputer (const edm::ParameterSet &parameters)
Private Attributes
unsigned int	minTracks
bool	unBoost
bool	use2d
bool	useSig

Detailed Description

Definition at line 16 of file SimpleSecondaryVertexComputer.h.

Constructor & Destructor Documentation

SimpleSecondaryVertexComputer::SimpleSecondaryVertexComputer ( const edm::ParameterSet & parameters ) [inline]

Definition at line 18 of file SimpleSecondaryVertexComputer.h.

References JetTagComputer::uses().

                                                                         :
                use2d(!parameters.getParameter<bool>("use3d")),
                useSig(parameters.getParameter<bool>("useSignificance")),
                unBoost(parameters.getParameter<bool>("unBoost")),
                minTracks(parameters.getParameter<unsigned int>("minTracks"))
        { uses("svTagInfos"); }

Member Function Documentation

float SimpleSecondaryVertexComputer::discriminator ( const TagInfoHelper & tagInfos ) const [inline, virtual]

Reimplemented from JetTagComputer.

Definition at line 25 of file SimpleSecondaryVertexComputer.h.

References reco::SecondaryVertexTagInfo::flightDistance(), JetTagComputer::TagInfoHelper::get(), info, funct::log(), minTracks, reco::SecondaryVertexTagInfo::nVertexTracks(), reco::SecondaryVertexTagInfo::nVertices(), reco::SecondaryVertexTagInfo::secondaryVertex(), Measurement1D::significance(), unBoost, use2d, useSig, Measurement1D::value(), relativeConstraints::value, and reco::TrackKinematics::vectorSum().

        {
                const reco::SecondaryVertexTagInfo &info =
                                tagInfos.get<reco::SecondaryVertexTagInfo>();
                unsigned int idx = 0;
                while(idx < info.nVertices()) {
                        if (info.nVertexTracks(idx) >= minTracks)
                                break;
                        idx++;
                }
                if (idx >= info.nVertices())
                        return -1.0;

                double gamma;
                if (unBoost) {
                        reco::TrackKinematics kinematics(
                                                info.secondaryVertex(idx));
                        gamma = kinematics.vectorSum().Gamma();
                } else
                        gamma = 1.0;

                double value;
                if (useSig)
                        value = info.flightDistance(idx, use2d).significance();
                else
                        value = info.flightDistance(idx, use2d).value();

                value /= gamma;

                if (useSig)
                        value = (value > 0) ? +std::log(1 + value)
                                            : -std::log(1 - value);

                return value;
        }