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70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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Class which represents a 4-momentum vector. Can perform vector addition, subtraction, dot product
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and generate a boost vector to its rest frame as well as apply a boost to itself.
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--GWM Dec 2020.
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*/
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#ifndef VEC4_H
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#define VEC4_H
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#include <cmath>
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namespace Mask {
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class Vec4 {
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public:
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Vec4();
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Vec4(double px, double py, double pz, double E);
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virtual ~Vec4();
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void SetVectorCartesian(double px, double py, double pz, double E);
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void SetVectorSpherical(double theta, double phi, double p, double E);
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inline double GetE() const { return m_data[3]; }
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inline double GetPx() const { return m_data[0]; }
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inline double GetPy() const { return m_data[1]; }
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inline double GetPz() const { return m_data[2]; }
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inline double GetP() const { return std::sqrt(m_data[0]*m_data[0] + m_data[1]*m_data[1] + m_data[2]*m_data[2]); }
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inline double GetPxy() const { return std::sqrt(m_data[0]*m_data[0] + m_data[1]*m_data[1]); }
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inline double GetTheta() const { return GetPxy() == 0.0 && GetPz() == 0.0 ? 0.0 : Atan2(GetPxy(), GetPz()); }
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inline double GetPhi() const {
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double phi = Atan2(GetPy(), GetPx());
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if(phi<0) phi += 2.0*M_PI;
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return GetPx() == 0.0 && GetPy() == 0.0 ? 0.0 : phi;
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}
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inline double GetInvMass() const { return std::sqrt(GetE()*GetE() - GetP()*GetP()); }
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inline double GetKE() const { return GetE() - GetInvMass(); }
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inline const double* GetBoost() const { return &m_boost[0]; }
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void ApplyBoost(const double* boost);
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//Only intended for use in looping access!
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inline const double operator[] (int index) const { return index>3 || index < 0 ? 0.0 : m_data[index]; }
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inline Vec4& operator=(const Vec4& rhs) { SetVectorCartesian(rhs.GetPx(), rhs.GetPy(), rhs.GetPz(), rhs.GetE()); return *this; }
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inline Vec4 operator+(const Vec4& rhs) const { return Vec4(rhs.GetPx()+GetPx(), rhs.GetPy()+GetPy(), rhs.GetPz()+GetPz(), rhs.GetE()+GetE()); }
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inline Vec4 operator-(const Vec4& rhs) const { return Vec4(rhs.GetPx()-GetPx(), rhs.GetPy()-GetPy(), rhs.GetPz()-GetPz(), rhs.GetE()-GetE()); }
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double Dot(const Vec4& rhs) const;
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Vec4 Cross(const Vec4& rhs) const;
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private:
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void CalcBoostToCM();
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//use instead of std::atan2. Better controll over x=0
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inline double Atan2(double y, double x) const {
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if(x != 0) return std::atan2(y, x);
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else if( y > 0 ) return M_PI/2.0;
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else if( y < 0 ) return -M_PI/2.0;
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else return 0.0;
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}
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double m_data[4];
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double m_boost[3];
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};
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}
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#endif
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