[1] | 1 | #ifndef _LORENTZ_VECTOR_HH_ |
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| 2 | #define _LORENTZ_VECTOR_HH_ |
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| 3 | |
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| 4 | //---------------------------------------------------------------------- |
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| 5 | // This file distributed with FastJet has been obtained from |
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| 6 | // http://www.pa.msu.edu/~huston/Les_Houches_2005/JetClu+Midpoint-StandAlone.tgz |
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| 7 | // |
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| 8 | // Permission to distribute it with FastJet has been granted by Joey |
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| 9 | // Huston (see the COPYING file in the main FastJet directory for |
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| 10 | // details). |
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| 11 | // Changes from the original file are listed below. |
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| 12 | //---------------------------------------------------------------------- |
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| 13 | |
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| 14 | // History of changes compared to the original LorentzVector.hh file |
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| 15 | // |
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| 16 | // 2011-11-14 Gregory Soyez <soyez@fastjet.fr> |
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| 17 | // |
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| 18 | // * removed some harmless warnings coming with the -Wshadow gcc option |
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| 19 | // |
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| 20 | // 2009-01-17 Gregory Soyez <soyez@fastjet.fr> |
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| 21 | // |
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| 22 | // * put the code in the fastjet::cdf namespace |
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| 23 | // |
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| 24 | // 2008-01-15 Gregory Soyez <soyez@fastjet.fr> |
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| 25 | // |
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| 26 | // * fixed issues with compilation under VC (definition of M_PI) |
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| 27 | // |
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| 28 | // 2007-02-21 Gavin Salam <salam@lpthe.jussieu.fr> |
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| 29 | // |
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| 30 | // * added option of choosing the scale used in the split-merge |
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| 31 | // procedure (pt [default], Et or mt) |
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| 32 | // |
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| 33 | // 2006-09-24 Gavin Salam <salam@lpthe.jussieu.fr> |
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| 34 | // |
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| 35 | // * added JetClu+MidPoint to FastJet |
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| 36 | |
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| 37 | #include <cmath> |
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| 38 | |
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| 39 | #ifndef M_PI |
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| 40 | #define M_PI 3.141592653589793238462643383279502884197 |
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| 41 | #endif |
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| 42 | |
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| 43 | #include <fastjet/internal/base.hh> |
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| 44 | |
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| 45 | FASTJET_BEGIN_NAMESPACE |
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| 46 | |
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| 47 | namespace cdf{ |
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| 48 | |
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| 49 | class LorentzVector |
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| 50 | { |
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| 51 | public: |
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| 52 | |
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| 53 | double px,py,pz,E; |
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| 54 | |
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| 55 | LorentzVector(): px(0), py(0), pz(0), E(0) {} |
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| 56 | LorentzVector(double p1, double p2, double p3, double p0): px(p1), py(p2), pz(p3), E(p0) {} |
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| 57 | LorentzVector(const LorentzVector& lv): px(lv.px), py(lv.py), pz(lv.pz), E(lv.E) {} |
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| 58 | double p() const {return sqrt(px*px + py*py + pz*pz);} |
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| 59 | double pt() const {return sqrt(px*px + py*py);} |
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| 60 | double mt() const {return sqrt((E-pz)*(E+pz));} |
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| 61 | double y() const {return 0.5*log((E + pz)/(E - pz));} |
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| 62 | double Et() const {return E/p()*pt();} |
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| 63 | double eta() const {return 0.5*log((p() + pz)/(p() - pz));} |
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| 64 | double phi() const |
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| 65 | { |
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| 66 | double r = atan2(py,px); |
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| 67 | if(r < 0) |
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| 68 | r += 2*M_PI; |
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| 69 | return r; |
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| 70 | } |
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| 71 | void add(LorentzVector v) |
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| 72 | { |
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| 73 | px += v.px; |
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| 74 | py += v.py; |
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| 75 | pz += v.pz; |
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| 76 | E += v.E; |
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| 77 | } |
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| 78 | void subtract(LorentzVector v) |
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| 79 | { |
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| 80 | px -= v.px; |
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| 81 | py -= v.py; |
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| 82 | pz -= v.pz; |
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| 83 | E -= v.E; |
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| 84 | } |
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| 85 | bool isEqual(LorentzVector v) |
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| 86 | { |
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| 87 | return px == v.px && py == v.py && pz == v.pz && E == v.E; |
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| 88 | } |
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| 89 | }; |
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| 90 | |
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| 91 | } // namespace cdf |
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| 92 | |
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| 93 | FASTJET_END_NAMESPACE |
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| 94 | |
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| 95 | #endif |
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