/usr/include/Rivet/Projections/Beam.hh is in librivet-dev 1.8.3-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | // -*- C++ -*-
#ifndef RIVET_Beam_HH
#define RIVET_Beam_HH
#include "Rivet/Projection.hh"
#include "Rivet/Event.hh"
#include "Rivet/Particle.hh"
namespace Rivet {
/// @name Stand-alone functions
//@{
/// Function to get beam particles from an event
ParticlePair beams(const Event& e);
/// Function to get beam particle IDs from an event
PdgIdPair beamIds(const Event& e);
/// Function to get beam particle IDs from a pair of particles
PdgIdPair beamIds(const ParticlePair& beams);
/// Function to get beam centre of mass energy from an event
double sqrtS(const Event& e);
/// Function to get beam centre of mass energy from a pair of particles
double sqrtS(const ParticlePair& beams);
/// Function to get beam centre of mass energy from a pair of beam momenta
double sqrtS(const FourMomentum& pa, const FourMomentum& pb);
//@}
/// @brief Project out the incoming beams
class Beam : public Projection {
public:
/// The default constructor.
Beam() {
setName("Beam");
}
/// Clone on the heap.
virtual const Projection* clone() const {
return new Beam(*this);
}
public:
/// The pair of beam particles in the current collision.
const ParticlePair& beams() const {
return _theBeams;
}
/// The pair of beam particle PDG codes in the current collision.
const PdgIdPair beamIds() const {
return Rivet::beamIds(beams());
}
/// Get centre of mass energy, \f$ \sqrt{s} \f$.
double sqrtS() const;
public:
/// Project on to the Event
virtual void project(const Event& e);
protected:
/// Compare with other projections.
virtual int compare(const Projection& UNUSED(p)) const {
return EQUIVALENT;
}
private:
/// The beam particles in the current collision
ParticlePair _theBeams;
};
}
#endif
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