Evaluation of a general three-denominator Lewis integral Original Research Article

An integral of the type ∫dq(q2+μ20)l+1(|q−q1|2+μ21)m+1(|q−q2|2+μ22)n+1 is expressed by contour integration as a sum of two finite series for any finite values of l, m, n, thus avoiding parametric differentiation of a complicated closed form expression with respect to μ0, μ1, μ2. This integral is frequently encountered in studies of atomic, molecular, nuclear and plasma physics. For purch