Reduction of one-loop integrals with higher poles by unitarity cut method

Unitarity cut method has been proved to be very useful in the computation of one-loop integrals. In this paper, we generalize the method to the situation where the powers of propagators in the denominator are larger than one in general. We show how to use the trick of differentiation over masses to translate the problem to the integrals where all powers are just one. Then by using the unitarity cut method, we can find the wanted reduction coefficients of all basis except the tadpole. Using this method, we calculate the reduction of scalar bubble, scalar triangle, scalar box and scalar pentagon with general power of propagators.

Automated summary

In this paper, the unitarity cut method is generalized to situations where the powers of propagators in the denominator are larger than one. The problem is simplified by using the differentiation over masses trick to reduce all powers to one, allowing for the calculation of reduction coefficients for scalar bubble, scalar triangle, scalar box, and scalar pentagon with general power of propagators.