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