VertexAnalysis Class Reference

Static Public Member Functions
static double	cAlpha (const reco::Vertex *pvtx, const reco::Vertex *svtx, float px, float py)
static double	cAlpha (const reco::Vertex *pvtx, const reco::Vertex *svtx, const TVector3 &cmom)
static void	dist2D (const reco::Vertex *pvtx, const reco::Vertex *svtx, float px, float py, float mass, double &ctauPV, double &ctauErrPV)
static void	dist2D (const reco::Vertex *pvtx, const reco::Vertex *svtx, float px, float py, double cosAlpha, float mass, double &ctauPV, double &ctauErrPV)

Detailed Description

Definition at line 53 of file BPHHistoSpecificDecay.cc.

Member Function Documentation

static double VertexAnalysis::cAlpha ( const reco::Vertex *  pvtx, const reco::Vertex *  svtx, float  px, float  py  )

inlinestatic

Definition at line 55 of file BPHHistoSpecificDecay.cc.

References reco::Vertex::x(), and reco::Vertex::y().

Referenced by BPHGenericVertexSelect::accept().

                                                                                           {
    TVector3 disp(svtx->x() - pvtx->x(), svtx->y() - pvtx->y(), 0);
    TVector3 cmom(px, py, 0);
    return disp.Dot(cmom) / (disp.Perp() * cmom.Perp());
  }

static double VertexAnalysis::cAlpha ( const reco::Vertex *  pvtx, const reco::Vertex *  svtx, const TVector3 &  cmom  )

inlinestatic

Definition at line 60 of file BPHHistoSpecificDecay.cc.

References reco::Vertex::x(), and reco::Vertex::y().

                                                                                             {
    TVector3 disp(svtx->x() - pvtx->x(), svtx->y() - pvtx->y(), 0);
    return disp.Dot(cmom) / (disp.Perp() * cmom.Perp());
  }

static void VertexAnalysis::dist2D ( const reco::Vertex *  pvtx, const reco::Vertex *  svtx, float  px, float  py, float  mass, double &  ctauPV, double &  ctauErrPV  )

inlinestatic

Definition at line 64 of file BPHHistoSpecificDecay.cc.

Referenced by BPHGenericVertexSelect::accept().

                                        {
    dist2D(pvtx, svtx, px, py, cAlpha(pvtx, svtx, px, py), mass, ctauPV, ctauErrPV);
    return;
  }

static void VertexAnalysis::dist2D ( const reco::Vertex *  pvtx, const reco::Vertex *  svtx, float  px, float  py, double  cosAlpha, float  mass, double &  ctauPV, double &  ctauErrPV  )

inlinestatic

Definition at line 74 of file BPHHistoSpecificDecay.cc.

References VertexDistanceXY::distance(), reco::Vertex::error(), GlobalErrorBase< T, ErrorWeightType >::matrix(), mathSSE::sqrt(), and Measurement1D::value().

                                        {
    TVector3 cmom(px, py, 0);
    AlgebraicVector3 vmom(px, py, 0);
    VertexDistanceXY vdistXY;
    Measurement1D distXY = vdistXY.distance(*svtx, *pvtx);
    ctauPV = distXY.value() * cosAlpha * mass / cmom.Perp();
    GlobalError sve = svtx->error();
    GlobalError pve = pvtx->error();
    AlgebraicSymMatrix33 vXYe = sve.matrix() + pve.matrix();
    ctauErrPV = sqrt(ROOT::Math::Similarity(vmom, vXYe)) * mass / cmom.Perp2();
    return;
  }