FastJet 3.5.2
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LorentzVector.hh
1//----------------------------------------------------------------------
2// This file distributed with FastJet has been obtained from SpartyJet
3// v2.20.0 by Pierre-Antoine Delsart, Kurtis L. Geerlings, Joey
4// Huston, Brian T. Martin and Chris Vermilion
5// For details, see http://www.pa.msu.edu/~huston/SpartyJet/
6// http://projects.hepforge.org/spartyjet/
7//
8// Changes from the original file are listed below.
9//----------------------------------------------------------------------
10
11// History of changes compared to the original LorentzVector.hh file
12//
13// 2011-11-14 Gregory Soyez <soyez@fastjet.fr>
14//
15// * removed some harmless warnings coming with the -Wshadow gcc option
16//
17// 2009-01-15 Gregory Soyez <soyez@fastjet.fr>
18//
19// * put the code in the fastjet::atlas namespace
20
21#ifndef _LORENTZ_VECTOR_HH_
22#define _LORENTZ_VECTOR_HH_
23
24#include <cmath>
25#include "fastjet/internal/base.hh"
26
27#ifndef M_PI
28#define M_PI 3.141592653589793238462643383279502884197
29#endif
30
31FASTJET_BEGIN_NAMESPACE
32
33namespace atlas{
34
35class LorentzVector
36{
37 public:
38
39 double px,py,pz,E;
40
41 LorentzVector(): px(0), py(0), pz(0), E(0) {}
42 LorentzVector(double p1, double p2, double p3, double p0): px(p1), py(p2), pz(p3), E(p0) {}
43 LorentzVector(const LorentzVector& lv): px(lv.px), py(lv.py), pz(lv.pz), E(lv.E) {}
44 double p() const {return sqrt(px*px + py*py + pz*pz);}
45 double pt() const {return sqrt(px*px + py*py);}
46 double mt() const {return sqrt((E-pz)*(E+pz));}
47 double y() const {return 0.5*log((E + pz)/(E - pz));}
48 double Et() const {return E/p()*pt();}
49 inline double et() const {return Et();}
50 inline double e() const {return E;}
51 double eta() const {return 0.5*log((p() + pz)/(p() - pz));}
52 double phi() const
53 {
54 double r = atan2(py,px);
55 if(r < 0)
56 r += 2*M_PI;
57 return r;
58 }
59 void add(LorentzVector v)
60 {
61 px += v.px;
62 py += v.py;
63 pz += v.pz;
64 E += v.E;
65 }
66 void subtract(LorentzVector v)
67 {
68 px -= v.px;
69 py -= v.py;
70 pz -= v.pz;
71 E -= v.E;
72 }
73 bool isEqual(LorentzVector v)
74 {
75 return px == v.px && py == v.py && pz == v.pz && E == v.E;
76 }
77};
78
79} // namespace atlas
80
81FASTJET_END_NAMESPACE
82
83#endif
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