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/**
* \authors The HEJ collaboration (see AUTHORS for details)
* \date 2020-2022
* \copyright GPLv2 or later
*/
#include "HEJ/WWjets.hh"
#include <algorithm>
#include <array>
#include <cassert>
#include <cmath>
#include <iostream>
#include "HEJ/Constants.hh"
#include "HEJ/EWConstants.hh"
#include "HEJ/LorentzVector.hh"
#include "HEJ/exceptions.hh"
// generated headers
#include "HEJ/currents/jV_jV.hh"
namespace HEJ {
namespace currents {
namespace {
using std::conj;
using COM = std::complex<double>;
// W Propagator
double WProp(const HLV & plbar, const HLV & pl,
ParticleProperties const & wprop
){
COM propW = COM(0.,-1.)/( (pl+plbar).m2() - wprop.mass*wprop.mass
+ COM(0.,1.)*wprop.mass*wprop.width);
double PropFactor=(propW*conj(propW)).real();
return PropFactor;
}
//! WW+Jets FKL Contributions
/**
* @brief WW+Jets Currents
* @param p1out Outgoing Particle 1 (W1 emission)
* @param pl1bar Outgoing anti-lepton 1 momenta
* @param pl1 Outgoing lepton 1 momenta
* @param p1in Incoming Particle 1 (W1 emission)
* @param p2out Outgoing Particle 2 (W2 emission)
* @param pl2bar Outgoing anti-lepton 2 momenta
* @param pl2 Outgoing lepton 2 momenta
* @param p2in Incoming Particle 2 (W2 emission)
* @param aqlineb Bool. Is Backwards quark line an anti-quark line?
* @param aqlinef Bool. Is Forwards quark line an anti-quark line?
*
* Calculates jW^\mu jW_\mu
*/
template<Helicity h1, Helicity h2>
std::vector <double> jW_jW(
const HLV & p1out, const HLV & pl1bar, const HLV & pl1, const HLV & p1in,
const HLV & p2out, const HLV & pl2bar, const HLV & pl2, const HLV & p2in,
ParticleProperties const & wprop
){
using helicity::minus;
const COM amp_top = jV_jV<h1,minus,h2,minus>(p1in,p1out,p2in,p2out,pl1,pl1bar,pl2,pl2bar);
const COM amp_bot = jV_jV<h1,minus,h2,minus>(p1in,p1out,p2in,p2out,pl2,pl2bar,pl1,pl1bar);
const double res_top = norm(amp_top);
const double res_bot = norm(amp_bot);
const double res_mix = 2.*real(amp_top*conj(amp_bot));
const double pref = WProp(pl1bar, pl1, wprop) * WProp(pl2bar, pl2, wprop);
return {res_top*pref, res_bot*pref, res_mix*pref};
}
} // namespace
std::vector <double> ME_WW_qQ(
const HLV & p1out, const HLV& pl1bar, const HLV& pl1, const HLV & p1in,
const HLV & p2out, const HLV& pl2bar, const HLV& pl2, const HLV & p2in,
ParticleProperties const & wprop
){
using helicity::minus;
return jW_jW<minus, minus>(
p1out, pl1bar, pl1, p1in,
p2out, pl2bar, pl2, p2in,
wprop
);
}
std::vector <double> ME_WW_qbarQ(
const HLV & p1out, const HLV& pl1bar, const HLV& pl1, const HLV & p1in,
const HLV & p2out, const HLV& pl2bar, const HLV& pl2, const HLV & p2in,
ParticleProperties const & wprop
){
using helicity::minus;
using helicity::plus;
return jW_jW<plus, minus>(
p1out, pl1bar, pl1, p1in,
p2out, pl2bar, pl2, p2in,
wprop
);
}
std::vector <double> ME_WW_qQbar(
const HLV & p1out, const HLV& pl1bar, const HLV& pl1, const HLV & p1in,
const HLV & p2out, const HLV& pl2bar, const HLV& pl2, const HLV & p2in,
ParticleProperties const & wprop
){
using helicity::minus;
using helicity::plus;
return jW_jW<minus, plus>(
p1out, pl1bar, pl1, p1in,
p2out, pl2bar, pl2, p2in,
wprop
);
}
std::vector <double> ME_WW_qbarQbar(
const HLV & p1out, const HLV& pl1bar, const HLV& pl1, const HLV & p1in,
const HLV & p2out, const HLV& pl2bar, const HLV& pl2, const HLV & p2in,
ParticleProperties const & wprop
){
using helicity::plus;
return jW_jW<plus, plus>(
p1out, pl1bar, pl1, p1in,
p2out, pl2bar, pl2, p2in,
wprop
);
}
} // namespace currents
} // namespace HEJ

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