BeamSmearingUtils.h File Reference

#include <utility>
#include "Rtypes.h"

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Functions
std::pair< Double_t, Double_t >	CalculateBeamOffset (Double_t smearBeam, Double_t paintBeam)

Function Documentation

CalculateBeamOffset()

std::pair< Double_t, Double_t > CalculateBeamOffset	(	Double_t	smearBeam,
		Double_t	paintBeam
	)

Calculate beam smearing and painting offsets

Parameters

smearBeam	Standard deviation for Gaussian smearing (in units appropriate for the generator)
paintBeam	Radius for uniform circular painting (in units appropriate for the generator)

Returns

std::pair<Double_t, Double_t> containing (dx, dy) offsets in same units as input parameters

Definition at line 10 of file BeamSmearingUtils.cxx.

                                                                      {
  Double_t dx = 0.0;
  Double_t dy = 0.0;
 
  // Gaussian beam smearing
  if (smearBeam > 0) {
    dx = gRandom->Gaus(0, smearBeam);
    dy = gRandom->Gaus(0, smearBeam);
  }
 
  // Uniform circular beam painting
  if (paintBeam > 0) {
    Double_t phi = gRandom->Uniform(0., 2 * TMath::Pi());
    dx += paintBeam * TMath::Cos(phi);
    dy += paintBeam * TMath::Sin(phi);
  }
 
  return {dx, dy};
}