LinearizerTrackParameters.hpp

Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file LinearizerTrackParameters.hpp

// This file is part of the Acts project.
//
// Copyright (C) 2023 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

namespace Acts {

enum LinIndices : unsigned int {
  // Global spatial position of a point on the track, must be stored as one
  // continuous block.
  eLinPos0 = 0u,
  eLinPos1 = eLinPos0 + 1u,
  eLinPos2 = eLinPos0 + 2u,
  // Global time when particle is at the point
  eLinTime = 3u,
  // Angles of the particle momentum in the global frame at the point
  eLinPhi = 4u,
  eLinTheta = eLinPhi + 1u,
  // Global inverse-momentum-like parameter, i.e. q/p or 1/p, at the point
  // The naming is inconsistent for the case of neutral track parameters where
  // the value is interpreted as 1/p not as q/p. This is intentional to avoid
  // having multiple aliases for the same element and for lack of an acceptable
  // common name.
  eLinQOverP = 6u,
  // Total number of components
  eLinSize = 7u,
  // Number of space-time components (3+1)
  eLinPosSize = 4u,
  // Number of momentum components
  eLinMomSize = 3u,
};

}  // namespace Acts