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5 changes: 3 additions & 2 deletions Tools/KFparticle/KFUtilities.h
Original file line number Diff line number Diff line change
Expand Up @@ -393,9 +393,10 @@ std::pair<float, float> kfCalculateImpactParameterZ(const KFParticle& candidate,
candidate.GetDistanceFromVertexXY(vtx, distanceToVertexXY, errDistanceToVertexXY);
const float distanceToVertex = candidate.GetDistanceFromVertex(vtx);
const float chi2ToVertex = candidate.GetDeviationFromVertex(vtx);
const float distanceToVertexZ2 = distanceToVertex*distanceToVertex - distanceToVertexXY*distanceToVertexXY;
const float distanceToVertexZ2 = distanceToVertex * distanceToVertex - distanceToVertexXY * distanceToVertexXY;
const float distanceToVertexZ = distanceToVertexZ2 > 0 ? std::sqrt(distanceToVertexZ2) : -std::sqrt(-distanceToVertexZ2);
const float errDistanceToVertexZ2 = (distanceToVertex*distanceToVertex*distanceToVertex*distanceToVertex/chi2ToVertex - distanceToVertexXY*distanceToVertexXY*errDistanceToVertexXY*errDistanceToVertexXY) / distanceToVertexZ2; const float errDistanceToVertexZ = errDistanceToVertexZ2 > 0 ? std::sqrt(errDistanceToVertexZ2) : -std::sqrt(-errDistanceToVertexZ2);
const float errDistanceToVertexZ2 = (distanceToVertex * distanceToVertex * distanceToVertex * distanceToVertex / chi2ToVertex - distanceToVertexXY * distanceToVertexXY * errDistanceToVertexXY * errDistanceToVertexXY) / distanceToVertexZ2;
const float errDistanceToVertexZ = errDistanceToVertexZ2 > 0 ? std::sqrt(errDistanceToVertexZ2) : -std::sqrt(-errDistanceToVertexZ2);
return std::make_pair(distanceToVertexZ, errDistanceToVertexZ);
}

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