/usr/include/siscone/momentum.h is in libsiscone-dev 2.0.6-1.
This file is owned by root:root, with mode 0o644.
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///////////////////////////////////////////////////////////////////////////////
// File: momentum.h //
// Description: header file for 4-momentum class Cmomentum //
// This file is part of the SISCone project. //
// For more details, see http://projects.hepforge.org/siscone //
// //
// Copyright (c) 2006 Gavin Salam and Gregory Soyez //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation; either version 2 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program; if not, write to the Free Software //
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
// //
// $Revision:: 163 $//
// $Date:: 2007-04-26 22:31:02 +0200 (Thu, 26 Apr 2007) $//
///////////////////////////////////////////////////////////////////////////////
#ifndef __VECTOR_H__
#define __VECTOR_H__
#include <vector>
#include <math.h>
#include "reference.h"
#include "geom_2d.h"
#include "defines.h"
namespace siscone{
/**
* \class Cmomentum
* \brief base class for dynamic coordinates management
*
* This class contains the information for particle or group of
* particles management.
* It includes all Lorentz properties as well as tools for summing them.
* Note: 'sums' over phi angles are indeed averages. This allows to
* deal with periodicity at each step
*/
class Cmomentum{
public:
/// default ctor
Cmomentum();
/// ctor with initialisation
Cmomentum(double _px, double _py, double _pz, double _E);
/// ctor with detailed initialisation
Cmomentum(double _eta, double _phi, Creference _ref);
/// default dtor
~Cmomentum();
/// computes pT
inline double perp() const {return sqrt(perp2());}
/// computes pT^2
inline double perp2() const {return px*px+py*py;}
/// computes m
inline double mass() const {return sqrt(mass2());}
/// computes m^2
inline double mass2() const {return perpmass2()-perp2();}
/// transverse mass, mt = sqrt(pt^2+m^2) = sqrt(E^2 - pz^2)
inline double perpmass() const {return sqrt((E-pz)*(E+pz));}
/// transverse mass squared, mt^2 = pt^2+m^2 = E^2 - pz^2
inline double perpmass2() const {return (E-pz)*(E+pz);}
/// computes transverse energy
inline double Et() const {return E/sqrt(1.0+pz*pz/perp2());}
/// computes transverse energy (squared)
inline double Et2() const {return E*E/(1.0+pz*pz/perp2());}
/// assignment of vectors
Cmomentum& operator = (const Cmomentum &v);
/// addition of vectors
/// !!! WARNING !!! no updating of eta and phi !!!
const Cmomentum operator + (const Cmomentum &v);
/// incrementation of vectors
/// !!! WARNING !!! no updating of eta and phi !!!
Cmomentum& operator += (const Cmomentum &v);
/// decrementation of vectors
/// !!! WARNING !!! no updating of eta and phi !!!
Cmomentum& operator -= (const Cmomentum &v);
/// build eta-phi from 4-momentum info
/// !!! WARNING !!!
/// !!! computing eta and phi is time-consuming !!!
/// !!! use this whenever you need eta or phi !!!
/// !!! automatically called for single-particle !!!
void build_etaphi();
double px; ///< x-momentum
double py; ///< y-momentum
double pz; ///< z-momentum
double E; ///< energy
double eta; ///< particle pseudo-rapidity
double phi; ///< particle azimuthal angle
int parent_index; ///< particle number in the parent list
int index; ///< internal particle number
//////////////////////////////////////////////
// the following part is used for checksums //
//////////////////////////////////////////////
Creference ref; ///< reference number for the vector
};
/// ordering of two vectors
/// this is by default done w.r.t. their references
bool operator < (const Cmomentum &v1, const Cmomentum &v2);
/// ordering of vectors in eta (e.g. used in collinear tests)
bool momentum_eta_less(const Cmomentum &v1, const Cmomentum &v2);
/// ordering of vectors in pt
bool momentum_pt_less(const Cmomentum &v1, const Cmomentum &v2);
//////////////////////////
// some handy utilities //
//////////////////////////
/// get distance between to eta-phi points
/// \param eta eta coordinate of first point
/// \param phi phi coordinate of first point
/// \param v vector defining the second point
inline double get_distance(double eta, double phi, Cmomentum *v){
double dx, dy;
dx = eta - v->eta;
dy = fabs(phi - v->phi);
if (dy>M_PI)
dy -= twopi;
return dx*dx+dy*dy;
}
}
#endif
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