Last change
on this file since 11 was 11, checked in by severine ovyn, 16 years ago |
Fastjet added; CDFCones directory has been changed
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File size:
1.1 KB
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[11] | 1 | #ifndef _LORENTZ_VECTOR_HH_
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| 2 | #define _LORENTZ_VECTOR_HH_
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| 3 |
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| 4 | #include <cmath>
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| 5 |
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| 6 | #ifndef M_PI
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| 7 | #define M_PI 3.141592653589793238462643383279502884197
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| 8 | #endif
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| 9 |
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| 10 | class LorentzVector
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| 11 | {
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| 12 | public:
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| 13 |
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| 14 | double px,py,pz,E;
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| 15 |
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| 16 | LorentzVector(): px(0), py(0), pz(0), E(0) {}
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| 17 | LorentzVector(double p1, double p2, double p3, double p0): px(p1), py(p2), pz(p3), E(p0) {}
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| 18 | LorentzVector(const LorentzVector& p): px(p.px), py(p.py), pz(p.pz), E(p.E) {}
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| 19 | double p() const {return sqrt(px*px + py*py + pz*pz);}
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| 20 | double pt() const {return sqrt(px*px + py*py);}
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| 21 | double mt() const {return sqrt((E-pz)*(E+pz));}
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| 22 | double y() const {return 0.5*log((E + pz)/(E - pz));}
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| 23 | double Et() const {return E/p()*pt();}
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| 24 | double eta() const {return 0.5*log((p() + pz)/(p() - pz));}
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| 25 | double phi() const
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| 26 | {
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| 27 | double r = atan2(py,px);
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| 28 | if(r < 0)
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| 29 | r += 2*M_PI;
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| 30 | return r;
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| 31 | }
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| 32 | void add(LorentzVector v)
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| 33 | {
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| 34 | px += v.px;
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| 35 | py += v.py;
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| 36 | pz += v.pz;
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| 37 | E += v.E;
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| 38 | }
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| 39 | void subtract(LorentzVector v)
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| 40 | {
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| 41 | px -= v.px;
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| 42 | py -= v.py;
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| 43 | pz -= v.pz;
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| 44 | E -= v.E;
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| 45 | }
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| 46 | bool isEqual(LorentzVector v)
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| 47 | {
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| 48 | return px == v.px && py == v.py && pz == v.pz && E == v.E;
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| 49 | }
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| 50 | };
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| 51 |
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| 52 | #endif
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