“…j l and h l are Bessel and first kind Hankel functions, andγ 0 = ρ 3 , γ i = −iρ 2 ⊗ σ i , γ 5 = ρ 1 ⊗ 1 ,where ρ and σ are Pauli matrices. Let us decomposeS jll (r, r ; w) = S 0 jll (r, r ; w) + S B jll (r, r ; w) (16)here S B jll (r, r ; w) is the boundary term[12] …”