Don't copy trackparcov when computing tracklengths

Author: jesgum

ALICE3/Core/TrackUtilities.cxx

@@ -48,14 +48,14 @@ void o2::upgrade::convertTLorentzVectorToO2Track(const int charge,
   new (&o2track)(o2::track::TrackParCov)(x, particle.Phi(), params, covm);
 }
 
-float o2::upgrade::computeParticleVelocity(float momentum, float mass)
+float o2::upgrade::computeParticleVelocity(const float momentum, const float mass)
 {
   const float a = momentum / mass;
   // uses light speed in cm/ps so output is in those units
   return o2::constants::physics::LightSpeedCm2PS * a / std::sqrt((1.f + a * a));
 }
 
-float o2::upgrade::computeTrackLength(o2::track::TrackParCov track, float radius, float magneticField)
+float o2::upgrade::computeTrackLength(const o2::track::TrackParCov& track, const float radius, const float magneticField)
 {
   // don't make use of the track parametrization
   float length = -100;

ALICE3/Core/TrackUtilities.h

@@ -105,13 +105,13 @@ o2::track::TrackParCov convertMCParticleToO2Track(McParticleType& particle,
 /// returns velocity in centimeters per picoseconds
 /// \param momentum the momentum of the track
 /// \param mass the mass of the particle
-float computeParticleVelocity(float momentum, float mass);
+float computeParticleVelocity(const float momentum, const float mass);
 
 /// function to calculate track length of this track up to a certain radius
 /// \param track the input track (TrackParCov)
 /// \param radius the radius of the layer you're calculating the length to
 /// \param magneticField the magnetic field to use when propagating
-float computeTrackLength(o2::track::TrackParCov track, float radius, float magneticField);
+float computeTrackLength(const o2::track::TrackParCov& track, const float radius, const float magneticField);
 
 } // namespace o2::upgrade