diff --git a/src/Wjets.cc b/src/Wjets.cc
index dac4bc2..dadae22 100644
--- a/src/Wjets.cc
+++ b/src/Wjets.cc
@@ -1,520 +1,520 @@
 /**
  *  \authors   The HEJ collaboration (see AUTHORS for details)
- *  \date      2020
+ *  \date      2020-2022
  *  \copyright GPLv2 or later
  */
 #include "HEJ/Wjets.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_j.hh"
 #include "HEJ/currents/jV_juno.hh"
 #include "HEJ/currents/jVuno_j.hh"
 #include "HEJ/currents/jW_jqqbar.hh"
 #include "HEJ/currents/jW_qqbar_j.hh"
 #include "HEJ/currents/jWqqbar_j.hh"
 #include "HEJ/currents/j_Wqqbar_j.hh"
 
 namespace HEJ {
 namespace currents {
 
   namespace {
     using COM = std::complex<double>;
 
     // --- Helper Functions ---
 
     // FKL W Helper Functions
     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;
     }
 
     /**
      * @brief  Contraction of W + unordered jet current with FKL current
      *
      * See eq:wunocurrent in the developer manual for the definition
      * of the W + unordered jet current
      */
     template<Helicity h1, Helicity h2, Helicity pol>
     double jM2Wuno(
         HLV const & pg, HLV const & p1, HLV const & plbar, HLV const & pl,
         HLV const & pa, HLV const & p2, HLV const & pb,
         ParticleProperties const & wprop
     ){
       using helicity::minus;
       const COM u1 = U1<h1, minus, h2, pol>(p1, p2, pa, pb, pg, pl, plbar);
       const COM u2 = U2<h1, minus, h2, pol>(p1, p2, pa, pb, pg, pl, plbar);
       const COM l = L<h1, minus, h2, pol>(p1, p2, pa, pb, pg, pl, plbar);
 
       const COM x = u1 - l;
       const COM y = u2 + l;
 
       // eq:VunoSumAveS in developer manual
       // TODO: use same form as for other uno currents,
       //       extracting at least a factor of K_q = C_F
       const double amp = C_A*C_F*C_F/2.*(norm(x)+norm(y)) - C_F/2.*(x*conj(y)).real();
       return WProp(plbar, pl, wprop) * amp;
     }
 
     /**
      * @brief Contraction of W + extremal qqbar current with FKL current
      *
      * See eq:crossed in the developer manual for the definition
      * of the W + extremal qqbar current.
      *
      */
     template<Helicity h1, Helicity h2, Helicity hg>
     double jM2_W_extremal_qqbar(
       HLV const & pg, HLV const & pq, HLV const & plbar, HLV const & pl,
       HLV const & pqbar, HLV const & p3, HLV const & pb,
       ParticleProperties const & wprop
     ){
 
       const COM u1Xcontr = U1X<h1, h2, hg>(pg, pq, plbar, pl, pqbar, p3, pb);
       const COM u2Xcontr = U2X<h1, h2, hg>(pg, pq, plbar, pl, pqbar, p3, pb);
       const COM lXcontr = LX<h1, h2, hg>(pg, pq, plbar, pl, pqbar, p3, pb);
 
       const COM x = u1Xcontr - lXcontr;
       const COM y = u2Xcontr + lXcontr;
 
       const double amp = C_A*C_F*C_F/2.*(norm(x)+norm(y)) - C_F/2.*(x*conj(y)).real();
       return WProp(plbar, pl, wprop) * amp;
     }
   } // Anonymous Namespace
 
   //! W+Jets FKL Contributions
   double ME_W_qQ(
     HLV const & p1out,
     HLV const & plbar, HLV const & pl,
     HLV const & p1in,
     HLV const & p2out, HLV const & p2in,
     ParticleProperties const & wprop
   ){
     using helicity::minus;
     using helicity::plus;
 
     const COM ampm = jV_j<minus, minus, minus>(p1in,p1out,p2in,p2out,pl,plbar);
     const COM ampp = jV_j<minus, minus, plus>(p1in,p1out,p2in,p2out,pl,plbar);
 
     const double Msqr = std::norm(ampm) + std::norm(ampp);
 
     return WProp(plbar, pl, wprop) * Msqr;
   }
 
   namespace {
     // helicity amplitude squares for contraction of W current with unordered
     // current
     template<Helicity h2, Helicity hg>
     double ampsq_jW_juno(
       HLV const & pa, HLV const & p1,
       HLV const & pb, HLV const & p2,
       HLV const & pg,
       HLV const & pl, HLV const & plbar
     ){
       using helicity::minus;
 
       const COM u1 = U1_jV<minus, minus, h2, hg>(pa,p1,pb,p2,pg,pl,plbar);
       const COM u2 = U2_jV<minus, minus, h2, hg>(pa,p1,pb,p2,pg,pl,plbar);
       const COM l  = L_jV<minus, minus, h2, hg>(pa,p1,pb,p2,pg,pl,plbar);
 
       const COM x = u1 - l;
       const COM y = u2 + l;
 
       return C_F*norm(x + y) - C_A*(x*conj(y)).real();
     }
   } // Anonymous Namespace
 
   double ME_W_unob_qQ(
       HLV const & p1out, HLV const & p1in, HLV const & p2out, HLV const & p2in,
       HLV const & pg, HLV const & plbar, HLV const & pl, ParticleProperties
       const & wprop
   ){
     using helicity::minus;
     using helicity::plus;
 
     // helicity assignments assume quarks
     // in the end, this is irrelevant since we sum over all helicities
     const double ampsq =
       + ampsq_jW_juno<minus, minus>(p2in,p2out,p1in,p1out,pg,pl,plbar)
       + ampsq_jW_juno<minus, plus> (p2in,p2out,p1in,p1out,pg,pl,plbar)
       + ampsq_jW_juno<plus, minus> (p2in,p2out,p1in,p1out,pg,pl,plbar)
       + ampsq_jW_juno<plus, plus>  (p2in,p2out,p1in,p1out,pg,pl,plbar)
       ;
 
     return WProp(plbar, pl, wprop)*ampsq;
   }
 
   namespace {
 
     // helicity sum helper for jWuno_j(...)
     template<Helicity h1>
     double jWuno_j_helsum(
         HLV const & pg, HLV const & p1, HLV const & plbar, HLV const & pl,
         HLV const & pa, HLV const & p2, HLV const & pb,
         ParticleProperties const & wprop
     ){
       using helicity::minus;
       using helicity::plus;
 
       const double ME2h1pp = jM2Wuno<h1, plus, plus>(
         pg, p1, plbar, pl, pa, p2, pb, wprop
       );
 
       const double ME2h1pm = jM2Wuno<h1, plus, minus>(
         pg, p1, plbar, pl, pa, p2, pb, wprop
       );
 
       const double ME2h1mp = jM2Wuno<h1, minus, plus>(
         pg, p1, plbar, pl, pa, p2, pb, wprop
       );
 
       const double ME2h1mm = jM2Wuno<h1, minus, minus>(
         pg, p1, plbar, pl, pa, p2, pb, wprop
       );
 
       return ME2h1pp + ME2h1pm + ME2h1mp + ME2h1mm;
     }
 
   } // Anonymous Namespace
 
   double ME_Wuno_qQ(
       HLV const & p1out, HLV const & p1in, HLV const & p2out, HLV const & p2in,
       HLV const & pg, HLV const & plbar, HLV const & pl,
       ParticleProperties const & wprop
   ){
     return jWuno_j_helsum<helicity::minus>(
       pg, p1out, plbar, pl, p1in, p2out, p2in, wprop
     )/(4.*C_A*C_A);
   }
 
   // helicity sum helper for jWqqbar_j(...)
   template<Helicity h1>
   double jWqqbar_j_helsum(
     HLV const & pg, HLV const & pq, HLV const & plbar, HLV const & pl,
     HLV const & pqbar, HLV const & p3, HLV const & pb,
     ParticleProperties const & wprop
   ){
     using helicity::minus;
     using helicity::plus;
 
     const double amp_h1pp = jM2_W_extremal_qqbar<h1, plus, plus>(
       pg, pq, plbar, pl, pqbar, p3, pb, wprop
     );
     const double amp_h1pm = jM2_W_extremal_qqbar<h1, plus, minus>(
       pg, pq, plbar, pl, pqbar, p3, pb, wprop
     );
     const double amp_h1mp = jM2_W_extremal_qqbar<h1, minus, plus>(
       pg, pq, plbar, pl, pqbar, p3, pb, wprop
     );
     const double amp_h1mm = jM2_W_extremal_qqbar<h1, minus, minus>(
       pg, pq, plbar, pl, pqbar, p3, pb, wprop
     );
 
     return amp_h1pp + amp_h1pm + amp_h1mp + amp_h1mm;
   }
 
   double ME_WExqqbar_qqbarQ(
       HLV const & pgin, HLV const & pqbarout, HLV const & plbar, HLV const & pl,
       HLV const & pqout, HLV const & p2out, HLV const & p2in,
       ParticleProperties const & wprop
   ){
     //Helicity sum and average over initial states.
     double ME2 = jWqqbar_j_helsum<helicity::plus>(
       pgin, pqbarout, plbar, pl, pqout, p2out, p2in, wprop
     )/(4.*C_A*C_A);
 
     //Correct colour averaging after crossing:
     ME2*=(3.0/8.0);
 
     return ME2;
   }
 
   namespace {
     template<Helicity h1, Helicity hg>
     double jW_jqqbar(
         HLV const & pb,
         HLV const & p2,
         HLV const & p3,
         HLV const & pa,
         HLV const & p1,
         HLV const & pl,
         HLV const & plbar
     ){
       using std::norm;
 
       static constexpr double cm1m1 = 8./3.;
       static constexpr double cm2m2 = 8./3.;
       static constexpr double cm3m3 = 6.;
       static constexpr double cm1m2 =-1./3.;
       static constexpr COM cm1m3 = COM{0.,-3.};
       static constexpr COM cm2m3 = COM{0.,3.};
 
       const COM m1 = jW_qggm1<h1,hg>(pb,p2,p3,pa,p1,pl,plbar);
       const COM m2 = jW_qggm2<h1,hg>(pb,p2,p3,pa,p1,pl,plbar);
       const COM m3 = jW_qggm3<h1,hg>(pb,p2,p3,pa,p1,pl,plbar);
 
       return
         + cm1m1*norm(m1)
         + cm2m2*norm(m2)
         + cm3m3*norm(m3)
         + 2.*real(cm1m2*m1*conj(m2))
         + 2.*real(cm1m3*m1*conj(m3))
         + 2.*real(cm2m3*m2*conj(m3)) ;
     }
   } // Anonymous Namespace
 
   // contraction of W current with extremal qqbar on the other side
   double ME_W_Exqqbar_QQq(
       HLV const & pa, HLV const & pb,
       HLV const & p1,  HLV const & p2,
       HLV const & p3, HLV const & plbar, HLV const & pl, bool aqlinepa,
       ParticleProperties const & wprop
   ){
     using helicity::minus;
     using helicity::plus;
 
     const double wPropfact = WProp(plbar, pl, wprop);
     const double prefactor = 2.*wPropfact/24./4.;
     if(aqlinepa) {
       return prefactor*(
         jW_jqqbar<plus, minus>(pb,p2,p3,pa,p1,pl,plbar)
         + jW_jqqbar<plus, plus>(pb,p2,p3,pa,p1,pl,plbar)
       );
     }
     return prefactor*(
       jW_jqqbar<minus, minus>(pb,p2,p3,pa,p1,pl,plbar)
       + jW_jqqbar<minus, plus>(pb,p2,p3,pa,p1,pl,plbar)
     );
   }
 
   namespace {
     // helper function for matrix element for W + Jets with central qqbar
     template<Helicity h1a, Helicity h4b>
     double amp_WCenqqbar_qq(
         HLV const & pa, HLV const &  p1,
         HLV const & pb, HLV const &  p4,
         HLV const &  pq, HLV const &  pqbar,
         HLV const &  pl, HLV const &  plbar,
         HLV const &  q11, HLV const &  q12
     ){
       using std::norm;
 
       const COM sym = M_sym_W<h1a, h4b>(
         pa, p1, pb, p4, pq, pqbar, pl, plbar, q11, q12
       );
       const COM cross = M_cross_W<h1a, h4b>(
         pa, p1, pb, p4, pq, pqbar, pl, plbar, q11, q12
       );
       const COM uncross = M_uncross_W<h1a, h4b>(
         pa, p1, pb, p4, pq, pqbar, pl, plbar, q11, q12
       );
 
       // Colour factors
       static constexpr double cmsms = 3.;
       static constexpr double cmumu = 4./3.;
       static constexpr double cmcmc = 4./3.;
       static constexpr COM cmsmu = COM{0., 3./2.};
       static constexpr COM cmsmc = COM{0.,-3./2.};
       static constexpr double cmumc = -1./6.;
 
       return
         +cmsms*norm(sym)
         +cmumu*norm(uncross)
         +cmcmc*norm(cross)
         +2.*real(cmsmu*sym*conj(uncross))
         +2.*real(cmsmc*sym*conj(cross))
         +2.*real(cmumc*uncross*conj(cross))
         ;
     }
   } // Anonymous Namespace
 
   // matrix element for W + Jets with W emission off central qqbar
   double ME_WCenqqbar_qq(
       HLV const & pa, HLV const & pb, HLV const & pl, HLV const & plbar,
       std::vector<HLV> const & partons, bool /* aqlinepa */, bool /* aqlinepb */,
       bool qqbar_marker, int nabove, ParticleProperties const & wprop
   ){
     using helicity::plus;
     using helicity::minus;
 
     CLHEP::HepLorentzVector q1 = pa;
     for(int i = 0; i <= nabove; ++i){
       q1 -= partons[i];
     }
     const auto qq = split_into_lightlike(q1);
     // since q1.m2() < 0 the following assertion is always true
     // see documentation for split_into_lightlike
     assert(qq.second.e() < 0);
 
     HLV pq;
     HLV pqbar;
     if (qqbar_marker){
       pqbar = partons[nabove+1];
       pq = partons[nabove+2];}
     else{
       pq = partons[nabove+1];
       pqbar = partons[nabove+2];
     }
     const HLV p1 = partons.front();
     const HLV p4 = partons.back();
 
     // 4 Different Helicity Choices (Differs from Pure Jet Case, where there is
     // also the choice in qqbar helicity.
     // the first helicity label is for aqlinepa == true,
     // the second one for aqlinepb == true
     // In principle the corresponding helicity should be flipped
     // if either of them is false, but we sum up all helicities,
     // so this has no effect in the end.
     const double amp_mm = amp_WCenqqbar_qq<minus, minus>(
       pa, p1, pb, p4, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
     const double amp_mp = amp_WCenqqbar_qq<minus, plus>(
       pa, p1, pb, p4, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
     const double amp_pm = amp_WCenqqbar_qq<plus, minus>(
       pa, p1, pb, p4, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
     const double amp_pp = amp_WCenqqbar_qq<plus, plus>(
       pa, p1, pb, p4, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
 
     // Divide by t channels, extremal + adjacent central vertex
     const double ta = (pa-p1).m2();
     const double t1 = q1.m2();
     const double t3 = (q1-pl-plbar-pq-pqbar).m2();
     const double tb = (p4-pb).m2();
 
     const double amp = WProp(plbar, pl, wprop)*(
       amp_mm+amp_mp+amp_pm+amp_pp
     )/(9.*4.*ta*t1*t3*tb);
 
     return amp;
   }
 
   // helper function for matrix element for W + Jets with central qqbar
   // W emitted off extremal parton
   // @TODO: code duplication with amp_WCenqqbar_qq
   template<Helicity h1a, Helicity hqqbar>
   double amp_W_Cenqqbar_qq(
       HLV const & pa, HLV const &  p1,
       HLV const & pb, HLV const &  pn,
       HLV const &  pq, HLV const &  pqbar,
       HLV const &  pl, HLV const &  plbar,
       HLV const &  q11, HLV const &  q12
   ){
     using std::norm;
 
     const COM crossed = M_cross<h1a, hqqbar>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, q11, q12
     );
     const COM uncrossed = M_qbar<h1a, hqqbar>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, q11, q12
     );
     const COM sym = M_sym<h1a, hqqbar>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, q11, q12
     );
 
     //Colour factors:
     static constexpr double cmsms = 3.;
     static constexpr double cmumu = 4./3.;
     static constexpr double cmcmc = 4./3.;
     static constexpr COM cmsmu = COM{0.,3./2.};
     static constexpr COM cmsmc = COM{0.,-3./2.};
     static constexpr double cmumc = -1./6.;
 
     return
       +cmsms*norm(sym)
       +cmumu*norm(uncrossed)
       +cmcmc*norm(crossed)
       +2.*real(cmsmu*sym*conj(uncrossed))
       +2.*real(cmsmc*sym*conj(crossed))
       +2.*real(cmumc*uncrossed*conj(crossed))
       ;
   }
 
   // matrix element for W + Jets with W emission *not* off central qqbar
   double ME_W_Cenqqbar_qq(
       HLV pa, HLV pb, HLV pl,HLV plbar,
       std::vector<HLV> partons, bool aqlinepa, bool aqlinepb,
       bool qqbar_marker, int nabove, int nbelow, bool forwards,
       ParticleProperties const & wprop
   ){
     using helicity::minus;
     using helicity::plus;
 
     if (!forwards){ //If Emission from Leg a instead, flip process.
       std::swap(pa, pb);
       std::reverse(partons.begin(),partons.end());
       std::swap(aqlinepa, aqlinepb);
       qqbar_marker = !qqbar_marker;
       std::swap(nabove,nbelow);
     }
 
     HLV q1=pa;
     for(int i=0;i<nabove+1;++i){
       q1-=partons.at(i);
     }
     const auto qq = split_into_lightlike(q1);
 
     HLV pq;
     HLV pqbar;
     if (qqbar_marker){
       pqbar = partons[nabove+1];
       pq = partons[nabove+2];}
     else{
       pq = partons[nabove+1];
       pqbar = partons[nabove+2];}
 
     // we assume that the W is emitted off a quark line
     // if this is not the case, we have to apply CP conjugation,
     // which is equivalent to swapping lepton and antilepton momenta
     if(aqlinepb) std::swap(pl, plbar);
 
     const HLV p1 = partons.front();
     const HLV pn = partons.back();
 
     // helicity labels are for aqlinepa == aqlineb == false,
     // In principle the helicities should be flipped
     // if either of them is true, but we sum up all helicities,
     // so this has no effect in the end.
     const double amp_mm = amp_W_Cenqqbar_qq<minus, minus>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
     const double amp_mp = amp_W_Cenqqbar_qq<minus, plus>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
     const double amp_pm = amp_W_Cenqqbar_qq<plus, minus>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
     const double amp_pp = amp_W_Cenqqbar_qq<plus, plus>(
       pa, p1, pb, pn, pq, pqbar, pl, plbar, qq.first, -qq.second
     );
 
     // Divide by t channels, extremal + adjacent central vertex
     const double ta = (pa-p1).m2();
     const double t1 = q1.m2();
     const double t3 = (q1 - pq - pqbar).m2();
     const double tb = (pn+pl+plbar-pb).m2();
 
     const double amp= WProp(plbar, pl, wprop)*(
       amp_mm+amp_mp+amp_pm+amp_pp
     )/(9.*4.*ta*t1*t3*tb);
 
     return amp;
   }
 } // namespace currents
 } // namespace HEJ
diff --git a/src/Zjets.cc b/src/Zjets.cc
index d3010dc..7ee4278 100644
--- a/src/Zjets.cc
+++ b/src/Zjets.cc
@@ -1,456 +1,456 @@
 /**
  *  \authors   The HEJ collaboration (see AUTHORS for details)
- *  \date      2020
+ *  \date      2020-2022
  *  \copyright GPLv2 or later
  */
 
 #include <vector>
 
 #include "HEJ/Constants.hh"
 #include "HEJ/EWConstants.hh"
 #include "HEJ/PDG_codes.hh"
 #include "HEJ/utility.hh"
 #include "HEJ/Zjets.hh"
 
 // generated headers
 #include "HEJ/currents/jV_j.hh"
 #include "HEJ/currents/jV_juno.hh"
 #include "HEJ/currents/jVuno_j.hh"
 
 namespace HEJ {
 namespace currents {
   namespace {
     using COM = std::complex<double>;
 
     // Z propagator
     COM ZProp(const double q, ParticleProperties const & zprop){
       return 1. / (q - zprop.mass*zprop.mass + COM(0.,1.)*zprop.width*zprop.mass);
     }
 
     // Photon propagator
     COM GProp(const double q) {
       return 1. / q;
     }
 
     // Weak charge
     template<Helicity h>
     double Zq(ParticleID PID, double stw2, double ctw);
 
     // Weak charge - Positive Spin
     template<>
     double Zq<helicity::plus>(
       const ParticleID PID,
       const double stw2,
       const double ctw
     ) {
       using namespace pid;
       // quarks
       if (PID == d || PID == s || PID == b)             return (+ 1.0 * stw2 / 3.0) / ctw;
       if (PID == u || PID == c)                         return (- 2.0 * stw2 / 3.0) / ctw;
       // antiquarks
       if (PID == d_bar || PID == s_bar || PID == b_bar) return (+ 0.5 - 1.0 * stw2 / 3.0) / ctw;
       if (PID == u_bar || PID == c_bar)                 return (- 0.5 + 2.0 * stw2 / 3.0) / ctw;
       // electron
       if (PID == electron) return stw2 / ctw;
       throw std::logic_error("ERROR! No weak charge found");
     }
 
     // Weak charge - Negative Spin
     template<>
     double Zq<helicity::minus>(
       const ParticleID PID,
       const double stw2,
       const double ctw
     ) {
       using namespace pid;
       // quarks
       if (PID == d || PID == s || PID == b)             return (- 0.5 + 1.0 * stw2 / 3.0) / ctw;
       if (PID == u || PID == c)                         return (+ 0.5 - 2.0 * stw2 / 3.0) / ctw;
       // antiquarks
       if (PID == d_bar || PID == s_bar || PID == b_bar) return (- 1.0 * stw2 / 3.0) / ctw;
       if (PID == u_bar || PID == c_bar)                 return (+ 2.0 * stw2 / 3.0) / ctw;
       // electron
       if (PID == electron) return (-1.0 / 2.0 + stw2) / ctw;
       throw std::logic_error("ERROR! No weak charge found");
     }
 
     // Electric charge
     double Gq (const ParticleID PID) {
       using namespace pid;
       if (PID == d || PID == s || PID == b)             return -1./3.;
       if (PID == u || PID == c)                         return +2./3.;
       if (PID == d_bar || PID == s_bar || PID == b_bar) return +1./3.;
       if (PID == u_bar || PID == c_bar)                 return -2./3.;
       throw std::logic_error("ERROR! No electric charge found");
     }
 
     //! Prefactor for Z+Jets Contributions
     /**
      * @brief Z+Jets Contributions Prefactor
      * @param aptype         Incoming Particle 1 type (Z emission)
      * @param propZ          Z Propagator
      * @param propG          Photon Propagator
      * @param stw2           Value of sin(theta_w)^2
      * @param ctw            Value of cos(theta_w)
      * @returns              Prefactors for Z+Jets for all helicity combinations
      *                       (includes couplings and propagators)
      */
     MultiArray<COM, 2, 2> Z_amp_pref(
       const ParticleID aptype,
       COM const & propZ, COM const & propG,
       const double stw2, const double ctw
     ){
       using helicity::plus;
       using helicity::minus;
 
       const double zq_a_p = Zq<plus>(aptype, stw2, ctw);
       const double zq_a_m = Zq<minus>(aptype, stw2, ctw);
       const double ze_p   = Zq<plus>(pid::electron, stw2, ctw);
       const double ze_m   = Zq<minus>(pid::electron, stw2, ctw);
       const double gq_a   = Gq(aptype);
 
       MultiArray<COM, 2, 2> res;
       res[ plus][ plus] = -2.*(zq_a_p * ze_p * propZ - gq_a * propG * stw2);
       res[ plus][minus] = -2.*(zq_a_p * ze_m * propZ - gq_a * propG * stw2);
       res[minus][minus] = -2.*(zq_a_m * ze_m * propZ - gq_a * propG * stw2);
       res[minus][ plus] = -2.*(zq_a_m * ze_p * propZ - gq_a * propG * stw2);
       return res;
     }
 
     //! Z+Jets FKL Contribution
     /**
      * @brief Z+Jets FKL Contribution
      * @param pa             Incoming Particle 1 (Z emission)
      * @param pb             Incoming Particle 2
      * @param p1             Outgoing Particle 1 (Z emission)
      * @param p2             Outgoing Particle 2
      * @param pep            Outgoing positron
      * @param pem            Outgoing electron
      * @returns              j_Z^\mu j_\mu for all helicities h1, hl, h2
      */
     MultiArray<COM, 2, 2, 2> jZ_j(
       const HLV & pa, const HLV & pb,
       const HLV & p1, const HLV & p2,
       const HLV & pep, const HLV & pem
     ){
       using helicity::plus;
       using helicity::minus;
 
       MultiArray<COM, 2, 2, 2> res;
 // NOLINTNEXTLINE
 #define ASSIGN_HEL(RES, J, H1, HL, H2) \
       RES[H1][HL][H2] = J<H1, HL, H2>(pa, p1, pb, p2, pem, pep)
 
       ASSIGN_HEL(res, jV_j, plus, minus, minus);
       ASSIGN_HEL(res, jV_j, plus, minus, plus);
       ASSIGN_HEL(res, jV_j, plus, plus, minus);
       ASSIGN_HEL(res, jV_j, plus, plus, plus);
 
 #undef ASSIGN_HEL
 
       for(auto hl: {minus, plus}) {
         for(auto h2: {minus, plus}) {
           res[minus][hl][h2] = std::conj(res[plus][flip(hl)][flip(h2)]);
         }
       }
       return res;
     }
 
     // X and Y as used in contractions with unordered currents
     struct XY {
       COM X;
       COM Y;
     };
 
     /**
      * @brief Z+Jets Unordered Contribution, unordered on Z side
      * @tparam h1            Helicity of line 1 (Z emission line)
      * @tparam hl            Lepton Helicity
      * @tparam h2            Helicity of line 2
      * @tparam hg            Helicity of unordered gluon
      * @param pa             Incoming Particle 1 (Z and Uno emission)
      * @param pb             Incoming Particle 2
      * @param pg             Unordered Gluon
      * @param p1             Outgoing Particle 1 (Z and Uno emission)
      * @param p2             Outgoing Particle 2
      * @param pep            Outgoing positron
      * @param pem            Outgoing electron
      * @returns              X: (U1-L), Y: (U2+l)
      *
      * Calculates j_Z_{uno}^\mu j_\mu. Ie, unordered with Z emission same side.
      */
     template<Helicity h1, Helicity hl, Helicity h2, Helicity hg>
     XY amp_jZuno_j(
       const HLV & pa, const HLV & pb, const HLV & pg,
       const HLV & p1, const HLV & p2,
       const HLV & pep, const HLV & pem
     ){
       const COM u1 = U1<h1, hl, h2, hg>(p1, p2, pa, pb, pg, pem, pep);
       const COM u2 = U2<h1, hl, h2, hg>(p1, p2, pa, pb, pg, pem, pep);
       const COM l  = L <h1, hl, h2, hg>(p1, p2, pa, pb, pg, pem, pep);
 
       return {u1 - l, u2 + l};
     }
 
     MultiArray<XY, 2, 2, 2, 2> jZuno_j(
       const HLV & pa, const HLV & pb, const HLV & pg,
       const HLV & p1, const HLV & p2,
       const HLV & pep, const HLV & pem
     ){
       using helicity::plus;
       using helicity::minus;
 
       MultiArray<XY, 2, 2, 2, 2> xy;
       // NOLINTNEXTLINE
 #define ASSIGN_HEL(XY, J, H1, H2, H3, H4) \
       XY[H1][H2][H3][H4] = J<H1, H2, H3, H4>(pa, pb, pg, p1, p2, pep, pem) // NOLINT
 
       ASSIGN_HEL(xy, amp_jZuno_j, minus, minus, minus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus, minus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus, minus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus, minus,  plus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus,  plus, minus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus,  plus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus,  plus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j, minus,  plus,  plus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus, minus, minus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus, minus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus, minus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus, minus,  plus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus,  plus, minus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus,  plus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus,  plus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZuno_j,  plus,  plus,  plus,  plus);
 
 #undef ASSIGN_HEL
 
       return xy;
     }
 
     /**
      * @brief Z+Jets Unordered Contribution, unordered opposite to Z side
      * @tparam h1            Helicity of line 1 (Z emission)
      * @tparam hl            Lepton Helicity
      * @tparam h2            Helicity of line 2 (unordered emission)
      * @tparam hg            Helicity of unordered gluon
      * @param pa             Incoming Particle 1 (Z emission)
      * @param pb             Incoming Particle 2 (unordered emission)
      * @param p1             Outgoing Particle 1 (Z emission)
      * @param p2             Outgoing Particle 2 (unordered emission)
      * @param pg             Unordered Gluon
      * @param pep            Outgoing positron
      * @param pem            Outgoing electron
      * @returns              X: (U1-L), Y: (U2+l)
      *
      * Calculates j_Z^\mu j_{uno}_\mu. Ie, unordered with Z emission opposite side.
      */
     template<Helicity h1, Helicity hl, Helicity h2, Helicity hg>
     XY amp_jZ_juno(
       const HLV & pa, const HLV & pb,
       const HLV & p1, const HLV & p2, const HLV & pg,
       const HLV & pep, const HLV & pem
     ){
       const COM u1 = U1_jV<h1, hl, h2, hg>(pa, p1, pb, p2, pg, pem, pep);
       const COM u2 = U2_jV<h1, hl, h2, hg>(pa, p1, pb, p2, pg, pem, pep);
       const COM l  = L_jV <h1, hl, h2, hg>(pa, p1, pb, p2, pg, pem, pep);
 
       return {u1 - l, u2 + l};
     }
 
     MultiArray<XY, 2, 2, 2, 2> jZ_juno(
       const HLV & pa, const HLV & pb,
       const HLV & p1, const HLV & p2, const HLV & pg,
       const HLV & pep, const HLV & pem
     ){
       using helicity::plus;
       using helicity::minus;
 
       MultiArray<XY, 2, 2, 2, 2> xy;
 
 // NOLINTNEXTLINE
 #define ASSIGN_HEL(XY, J, H1, H2, H3, H4) \
       XY[H1][H2][H3][H4] = J<H1, H2, H3, H4>(pa, pb, p1, p2, pg, pep, pem)
 
       ASSIGN_HEL(xy, amp_jZ_juno, minus, minus, minus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus, minus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus, minus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus, minus,  plus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus,  plus, minus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus,  plus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus,  plus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno, minus,  plus,  plus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus, minus, minus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus, minus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus, minus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus, minus,  plus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus,  plus, minus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus,  plus, minus,  plus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus,  plus,  plus, minus);
       ASSIGN_HEL(xy, amp_jZ_juno,  plus,  plus,  plus,  plus);
 
 #undef ASSIGN_HEL
 
       return xy;
     }
 
   } // Anonymous Namespace
 
 
   std::vector <double> ME_Z_qQ(const HLV & pa, const HLV & pb, const HLV & p1, const HLV & p2,
                               const HLV & pep, const HLV & pem,
                               const ParticleID aptype, const ParticleID bptype,
                               ParticleProperties const & zprop,
                               const double stw2, const double ctw
   ){
     using helicity::minus;
     using helicity::plus;
 
     const HLV pZ = pep + pem;
     const COM propZ = ZProp(pZ.m2(), zprop);
     const COM propG = GProp(pZ.m2());
 
     MultiArray<COM, 2, 2> pref_top = Z_amp_pref(aptype, propZ, propG, stw2, ctw);
     MultiArray<COM, 2, 2> pref_bot = Z_amp_pref(bptype, propZ, propG, stw2, ctw);
 
     MultiArray<COM, 2, 2, 2> coeff_top = jZ_j(pa, pb, p1, p2, pep, pem);
     MultiArray<COM, 2, 2, 2> coeff_bot = jZ_j(pb, pa, p2, p1, pep, pem);
 
     double sum_top=0.;
     double sum_bot=0.;
     double sum_mix=0.;
     for(auto h1: {minus, plus}){
       for(auto hl: {minus, plus}){
         for(auto h2: {minus, plus}){
           const COM res_top = pref_top[h1][hl] * coeff_top[h1][hl][h2];
           const COM res_bot = pref_bot[h2][hl] * coeff_bot[h2][hl][h1];
           sum_top += norm(res_top);
           sum_bot += norm(res_bot);
           sum_mix += 2.0 * real(res_top * conj(res_bot));
         }
       }
     }
     return {sum_top, sum_bot, sum_mix};
   }
 
 
   double ME_Z_qg(const HLV & pa, const HLV & pb, const HLV & p1, const HLV & p2,
                 const HLV & pep, const HLV & pem,
                 const ParticleID aptype, const ParticleID /*bptype*/,
                 ParticleProperties const & zprop,
                 const double stw2, const double ctw
   ){
     using helicity::minus;
     using helicity::plus;
 
     const HLV pZ = pep + pem;
     const COM propZ = ZProp(pZ.m2(), zprop);
     const COM propG = GProp(pZ.m2());
 
     MultiArray<COM, 2, 2> pref = Z_amp_pref(aptype, propZ, propG, stw2, ctw);
     MultiArray<COM, 2, 2, 2> coeff = jZ_j(pa, pb, p1, p2, pep, pem);
 
     double sum = 0.;
     for(auto h1: {minus, plus}){
       for(auto hl: {minus, plus}){
         for(auto h2: {minus, plus}){
           sum += norm(pref[h1][hl] * coeff[h1][hl][h2]);
         }
       }
     }
 
     return sum;
   }
 
   std::vector <double> ME_Zuno_qQ(const HLV & pa, const HLV & pb,
                                   const HLV & pg, const HLV & p1, const HLV & p2,
                                   const HLV & pep, const HLV & pem,
                                   const ParticleID aptype, const ParticleID bptype,
                                   ParticleProperties const & zprop,
                                   const double stw2, const double ctw
   ){
     using helicity::minus;
     using helicity::plus;
 
     const HLV pZ = pep + pem;
     const COM propZ = ZProp(pZ.m2(), zprop);
     const COM propG = GProp(pZ.m2());
 
     MultiArray<COM, 2, 2> prefact_top = Z_amp_pref(aptype, propZ, propG, stw2, ctw);
     MultiArray<COM, 2, 2> prefact_bot = Z_amp_pref(bptype, propZ, propG, stw2, ctw);
 
     const MultiArray<XY, 2, 2, 2, 2> coeff_top = jZuno_j(pa, pb, pg, p1, p2, pep, pem);
     const MultiArray<XY, 2, 2, 2, 2> coeff_bot = jZ_juno(pb, pa, p2, p1, pg, pep, pem);
 
     double sum_top=0.;
     double sum_bot=0.;
     double sum_mix=0.;
     for(auto h1: {minus, plus}){
       for(auto hl: {minus, plus}){
         for(auto h2: {minus, plus}){
           for(auto hg: {minus, plus}){
             const COM pref_top = prefact_top[h1][hl];
             const COM x_top = coeff_top[h1][hl][h2][hg].X;
             const COM y_top = coeff_top[h1][hl][h2][hg].Y;
 
             const COM pref_bot = prefact_bot[h2][hl];
             const COM x_bot = coeff_bot[h2][hl][h1][hg].X;
             const COM y_bot = coeff_bot[h2][hl][h1][hg].Y;
 
             sum_top += norm(pref_top) * (C_A*C_F*C_F/2.*(norm(x_top)+norm(y_top))
                                         - C_F/2.*(x_top*conj(y_top)).real());
             sum_bot += norm(pref_bot) * (C_A*C_F*C_F/2.*(norm(x_bot)+norm(y_bot))
                                         - C_F/2.*(x_bot*conj(y_bot)).real());
 
             const COM xx = C_A*C_F*C_F/2. * pref_top * x_top * conj(pref_bot * x_bot);
             const COM yy = C_A*C_F*C_F/2. * pref_top * y_top * conj(pref_bot * y_bot);
             const COM xy = -C_F/2. * (pref_top * x_top * conj(pref_bot * y_bot)
                                       + pref_top * y_top * conj(pref_bot * x_bot));
             sum_mix += 2.0 * real(xx + yy + xy);
           }
         }
       }
     }
     //Helicity sum and average over initial states
     const double pref = 1./(4.*C_A*C_A);
 
     return {sum_top*pref, sum_bot*pref, sum_mix*pref};
   }
 
 
   double ME_Zuno_qg(const HLV & pa, const HLV & pb,
                     const HLV & pg, const HLV & p1, const HLV & p2,
                     const HLV & pep, const HLV & pem,
                     const ParticleID aptype, const ParticleID /*bptype*/,
                     ParticleProperties const & zprop,
                     const double stw2, const double ctw
   ){
     using helicity::minus;
     using helicity::plus;
 
     const HLV pZ = pep + pem;
     const COM propZ = ZProp(pZ.m2(), zprop);
     const COM propG = GProp(pZ.m2());
 
     MultiArray<COM, 2, 2> pref = Z_amp_pref(aptype, propZ, propG, stw2, ctw);
     const auto coeff = jZuno_j(pa, pb, pg, p1, p2, pep, pem);
 
     double sum = 0.;
     for(auto h1: {minus, plus}){
       for(auto hl: {minus, plus}){
         for(auto h2: {minus, plus}){
           for(auto hg: {minus, plus}){
             const COM X = coeff[h1][hl][h2][hg].X;
             const COM Y = coeff[h1][hl][h2][hg].Y;
             sum += norm(pref[h1][hl]) * (C_A*C_F*C_F/2.*(norm(X)+norm(Y))
                                         - C_F/2.*(X*conj(Y)).real());
           }
         }
       }
     }
 
     //Helicity sum and average over initial states
     return sum / (4.*C_A*C_A);
 
   }
 } // namespace currents
 } // namespace HEJ