[d7d2da3] | 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 |
|
---|
| 31 | FASTJET_BEGIN_NAMESPACE
|
---|
| 32 |
|
---|
| 33 | namespace atlas{
|
---|
| 34 |
|
---|
| 35 | class 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 |
|
---|
| 81 | FASTJET_END_NAMESPACE
|
---|
| 82 |
|
---|
| 83 | #endif
|
---|