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diff --git a/include/HEJ/Tensor.hh b/include/HEJ/Tensor.hh
index e048acf..45a3811 100644
--- a/include/HEJ/Tensor.hh
+++ b/include/HEJ/Tensor.hh
@@ -1,170 +1,170 @@
/** \file
* \brief Tensor Template Class declaration.
*
* This file contains the declaration of the Tensor Template class. This
* is used to calculate some of the more complex currents within the
* W+Jets implementation particularly.
*
* \authors The HEJ collaboration (see AUTHORS for details)
* \date 2019
* \copyright GPLv2 or later
*/
#pragma once
#include <array>
#include <complex>
#include <valarray>
namespace CLHEP {
class HepLorentzVector;
}
class CCurrent;
typedef std::complex<double> COM;
///@TODO put in some namespace
namespace detail {
static constexpr std::size_t d = 4;
}
template <unsigned int N>
class Tensor{
public:
static constexpr std::size_t d = detail::d;
//! Constructor
Tensor();
explicit Tensor(COM x);
//! Rank of Tensor
constexpr unsigned rank() const{
return N;
};
//! total number of entries
- int size() const {
+ std::size_t size() const {
return components.size();
};
//! Tensor element with given indices
template<typename... Indices>
COM const & operator()(Indices... i) const;
//! Tensor element with given indices
template<typename... Indices>
COM & operator()(Indices... rest);
//! implicit conversion to complex number for rank 0 tensors (scalars)
operator COM() const;
Tensor<N> & operator*=(COM const & x);
Tensor<N> & operator/=(COM const & x);
Tensor<N> & operator+=(Tensor<N> const & T2);
Tensor<N> & operator-=(Tensor<N> const & T2);
//! Outer product of two tensors
template<unsigned M>
Tensor<N+M> outer(Tensor<M> const & T2) const;
//! Outer product of two tensors
template<unsigned K, unsigned M>
friend Tensor<K+M> outer(Tensor<K> const & T1, Tensor<M> const & T2);
/**
* \brief T^(mu1...mk..mN)T2_(muk) contract kth index, where k member of [1,N]
* @param T2 Tensor of Rank 1 to contract with.
* @param k int to contract Tensor T2 with from original Tensor.
* @returns T1.contract(T2,1) -> T1^(mu,nu,rho...)T2_mu
*/
Tensor<N-1> contract(const Tensor<1> T2, int k);
std::valarray<COM> components;
private:
COM sign(unsigned int i);
};
template<unsigned N>
Tensor<N> operator*(Tensor<N> t, COM const & x);
template<unsigned N>
Tensor<N> operator/(Tensor<N> t, COM const & x);
template<unsigned N>
Tensor<N> operator+(Tensor<N> T1, Tensor<N> const & T2);
template<unsigned N>
Tensor<N> operator-(Tensor<N> T1, Tensor<N> const & T2);
/**
* \brief Returns diag(+---) Metric
* @returns Metric {(1,0,0,0),(0,-1,0,0),(0,0,-1,0),(0,0,0,-1)}
*/
Tensor<2> Metric();
/**
* \brief Calculates current <p1|mu|p2>
* @param p1 Momentum of Particle 1
* @param h1 Helicity of Particle 1 (Boolean, False = -h, True = +h)
* @param p2 Momentum of Particle 2
* @param h2 Helicity of Particle 2 (Boolean, False = -h, True = +h)
* @returns Tensor T^mu = <p1|mu|p2>
*
* @note in/out configuration considered in calculation
*/
Tensor<1> TCurrent(CLHEP::HepLorentzVector p1, bool h1,
CLHEP::HepLorentzVector p2, bool h2);
/**
* \brief Calculates current <p1|mu nu rho|p2>
* @param p1 Momentum of Particle 1
* @param h1 Helicity of Particle 1 (Boolean, False = -h, True = +h)
* @param p2 Momentum of Particle 2
* @param h2 Helicity of Particle 2 (Boolean, False = -h, True = +h)
* @returns Tensor T^mu^nu^rho = <p1|mu nu rho|p2>
*
* @note in/out configuration considered in calculation
*/
Tensor<3> T3Current(CLHEP::HepLorentzVector p1, bool h1,
CLHEP::HepLorentzVector p2, bool h2);
/**
* \brief Calculates current <p1|mu nu rho tau sigma|p2>
* @param p1 Momentum of Particle 1
* @param h1 Helicity of Particle 1 (Boolean, False = -h, True = +h)
* @param p2 Momentum of Particle 2
* @param h2 Helicity of Particle 2 (Boolean, False = -h, True = +h)
* @returns Tensor T^mu^nu^rho = <p1|mu nu rho tau sigma|p2>
*
* @note in/out configuration considered in calculation
*/
Tensor<5> T5Current(CLHEP::HepLorentzVector p1, bool h1,
CLHEP::HepLorentzVector p2, bool h2);
/**
* \brief Convert from CCurrent class
* @param j Current in CCurrent format
* @returns Current in Tensor Format
*/
Tensor<1> Construct1Tensor(CCurrent j);
/**
* \brief Convert from HLV class
* @param p Current in HLV format
* @returns Current in Tensor Format
*/
Tensor<1> Construct1Tensor(CLHEP::HepLorentzVector p);
/**
* \brief Construct Epsilon (Polarisation) Tensor
* @param k Momentum of incoming/outgoing boson
* @param ref Reference momentum for calculation
* @param pol Polarisation of boson
* @returns Polarisation Tensor E^mu
*/
Tensor<1> eps(CLHEP::HepLorentzVector k, CLHEP::HepLorentzVector ref, bool pol);
//! Initialises Tensor values by iterating over permutations of gamma matrices.
bool init_sigma_index();
// implementation of template functions
#include "HEJ/detail/Tensor_impl.hh"

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