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Kinematics.h
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// -*- C++ -*-
#ifndef HERWIG_MyKinematics_H
#define HERWIG_MyKinematics_H
//
// This is the declaration of the Kinematics class.
//
#include "Herwig++/Config/Herwig.h"
#include <ThePEG/CLHEPWrap/ThreeVector.h>
#include <ThePEG/CLHEPWrap/LorentzRotation.h>
#include <ThePEG/Repository/EventGenerator.h>
namespace Herwig {
using namespace ThePEG;
/** \ingroup Decay
*
* This is a pure static class which provides some useful methods
* for kinematics computation, such as the two body decays.
*
* NB) Other useful kinematical methods (and probably even those
* implemented in Kinematics class!) are in
* ThePEG/Utilities/UtilityBase.h
*
* @see UtilityBase
*/
class MyKinematics {
public:
/**
* Generate a two-body decay.
* @param p The input momentum of the decaying particle
* @param m1 The mass of the first decay product
* @param m2 The mass of the second decay product
* @param unitDir1 The direction of the first decay product.
* @param p1 The output momentum of the first decay product.
* @param p2 The output momentum of the second decay product.
*/
static void twoBodyDecay(const Lorentz5Momentum & p,
const double m1, const double m2,
const Vector3 & unitDir1,
Lorentz5Momentum & p1, Lorentz5Momentum & p2);
/**
* Generate a two-body decya
* @param p The input momentum of the decaying particle
* @param m1 The mass of the first decay product
* @param m2 The mass of the second decay product
* @param cosThetaStar1 the cosine of the polar angle for the first decay product.
* @param phiStar1 The azimuthal angle of the first decay product.
* @param p1 The output momentum of the first decay product.
* @param p2 The output momentum of the second decay product.
*/
static void twoBodyDecay(const Lorentz5Momentum & p,
const double m1, const double m2,
const double cosThetaStar1, const double phiStar1,
Lorentz5Momentum & p1, Lorentz5Momentum & p2);
/**
* Momentum of the decay products in a two body decay
* @param M mass of the decaying particle.
* @param m1 The mass of the first decay product.
* @param m2 The mass of the second decay product.
* @return The momentum of the decay products in the rest-frame of the decay
* particle.
*/
static inline Energy CMMomentum(const Energy M,
const Energy m1,
const Energy m2);
/**
* It returns the unit 3-vector with the given cosTheta and phi.
* @param cosTheta The cosine of the polar angle.
* @param phi The azimuthal angle
* @return The unit vector.
*/
static inline Vector3 unitDirection(const double cosTheta, const double phi);
/**
* Create matrix that rotates a 5-momentum to z-axis, then rotates by \f$\phi\f$
* (where \f$\phi\f$ is given as two double args, \f$\cos\phi\f$ and \f$\sin\phi\f$.
* @param mom The 5-momentum
* @param cos Cosine of the angle \f$\phi\f$, \f$\cos\phi\f$.
* @param sin Sine of the angle \f$\phi\f$, \f$\sin\phi\f$.
*/
static LorentzRotation rotation(const Lorentz5Momentum mom, const double cos,
const double sin);
/**
* A routine to randomly generate two angles.
* @param eg Pointer to an event generator to allow access to the random
* number generator.
* @param cosTheta The output value of the cosine of the polar angle between [-1,1]
* @param phi The azimuthal angle between 0 and \f$2\pi\f$.
*/
static void generateAngles(tEGPtr eg, double & cosTheta, double & phi);
private:
/**
* pure static class, can't be created.
*/
MyKinematics();
/**
* pure static class, can't be copied.
*/
MyKinematics(const MyKinematics & x);
/**
* pure static class, can't be assigned.
*/
MyKinematics & operator=(const MyKinematics & x);
};
}
#include "Kinematics.icc"
#endif /* HERWIG_Kinematics_H */

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