Progress towards 2 → 2 scattering at two loops
نویسندگان
چکیده
We discuss the two-loop integrals necessary for evaluating massless 2 → 2 scattering amplitudes. As a test process, we consider the leading colour two-loop contribution to q ¯ q → q ′ ¯ q ′. We show that for physical scattering processes the two Smirnov-Veretin planar box graphs I1 and I2 are accompanied by factors of 1/(D − 4) thereby necessitating a knowledge of both I1 and I2 to O(ǫ). Using an alternative basis I1 and the irreducible numerator integral I3, the factors of 1/(D − 4) disappear.
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