extensions/edm4eic/EDM4eicToActs.h

0001 // SPDX-License-Identifier: LGPL-3.0-or-later
0002 // Copyright (C) 2025 Wouter Deconinck
0003
0004 #pragma once
0005
0006 #include <Acts/Definitions/TrackParametrization.hpp>
0007 #include <Acts/Definitions/Units.hpp>
0008
0009 namespace eicrecon {
0010
0011 // This array relates the Acts and EDM4eic covariance matrices, including
0012 // the unit conversion to get from Acts units into EDM4eic units.
0013 //
0014 // Note: std::map is not constexpr, so we use a constexpr std::array
0015 // std::array initialization need double braces since arrays are aggregates
0016 // ref: https://en.cppreference.com/w/cpp/language/aggregate_initialization
0017 static constexpr std::array<std::pair<Acts::BoundIndices, double>, 6> edm4eic_indexed_units{
0018     {{Acts::eBoundLoc0, Acts::UnitConstants::mm},
0019      {Acts::eBoundLoc1, Acts::UnitConstants::mm},
0020      {Acts::eBoundPhi, 1.},
0021      {Acts::eBoundTheta, 1.},
0022      {Acts::eBoundQOverP, 1. / Acts::UnitConstants::GeV},
0023      {Acts::eBoundTime, Acts::UnitConstants::ns}}};
0024
0025 } // namespace eicrecon