/usr/include/Rivet/Projections/PVertex.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 | // -*- C++ -*-
#ifndef RIVET_PVertex_HH
#define RIVET_PVertex_HH
#include "Rivet/Projection.hh"
#include "Rivet/Event.hh"
#include "Rivet/Particle.hh"
namespace Rivet {
/// @brief Get the position of the primary vertex of an event.
///
/// HepMC doesn't reliably return the signal process vertex, so
/// we have to use the "decay vertex" of the beam particles.
/// This gives the right position, within experimental resolution,
/// but ISR effects can mean that the actual vertex is not right.
/// Hence, we don't expose the HepMC GenVertex directly - if it were
/// available, people might try to e.g. look at the \f$ p_T \f$
/// of the vertex children, which would be extremely unreliable.
///
/// @deprecated This should hardly ever be required for MC studies, and is not necessarily reliable!
class PVertex : public Projection {
public:
/// @name Standard constructors and destructors.
//@{
/// The default constructor.
PVertex()
: _thePVertex(0)
{
setName("PVertex");
}
/// Clone on the heap.
virtual const Projection* clone() const {
return new PVertex(*this);
}
//@}
/// Get the primary vertex position.
const Vector3 position() const {
if (_thePVertex != 0) return Vector3(_thePVertex->position());
return Vector3(0,0,0);
}
protected:
/// Do the projection.
void project(const Event& e);
/// Compare projections.
int compare(const Projection& UNUSED(p)) const {
return EQUIVALENT;
}
private:
/// The Primary Vertex in the current collision.
GenVertex* _thePVertex;
};
}
#endif
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