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SimpleSecondaryVertexComputer Class Reference

#include <RecoBTag/SecondaryVertex/interface/SimpleSecondaryVertexComputer.h>

Inheritance diagram for SimpleSecondaryVertexComputer:

List of all members.

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

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Detailed Description

Definition at line 16 of file SimpleSecondaryVertexComputer.h.

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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"))
        { uses("svTagInfos"); }

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Member Function Documentation

float SimpleSecondaryVertexComputer::discriminator

(

const TagInfoHelper &

tagInfos

)

const [inline, virtual]

Reimplemented from JetTagComputer.

Definition at line 24 of file SimpleSecondaryVertexComputer.h.

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

        {
                const reco::SecondaryVertexTagInfo &info =
                                tagInfos.get<reco::SecondaryVertexTagInfo>();
                if (info.nVertices() == 0)
                        return -1.0;

                double gamma;
                if (unBoost) {
                        reco::TrackKinematics kinematics(
                                                info.secondaryVertex(0));
                        gamma = kinematics.vectorSum().Gamma();
                } else
                        gamma = 1.0;

                double value;
                if (useSig)
                        value = info.flightDistance(0, use2d).significance();
                else
                        value = info.flightDistance(0, use2d).value();

                value /= gamma;

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

                return value;
        }

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Member Data Documentation

bool SimpleSecondaryVertexComputer::unBoost [private]

Definition at line 57 of file SimpleSecondaryVertexComputer.h.

Referenced by discriminator().

bool SimpleSecondaryVertexComputer::use2d [private]

Definition at line 55 of file SimpleSecondaryVertexComputer.h.

Referenced by discriminator().

bool SimpleSecondaryVertexComputer::useSig [private]

Definition at line 56 of file SimpleSecondaryVertexComputer.h.

Referenced by discriminator().

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The documentation for this class was generated from the following file:

• RecoBTag/SecondaryVertex/interface/SimpleSecondaryVertexComputer.h

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