On non-factorisable contributions to t-channel single-top production

Abstract

We compute the non-factorisable contribution to the two-loop helicity amplitude for t-channel single-top production, the last missing piece of the two-loop virtual corrections to this process. Our calculation employs analytic reduction to master integrals and the auxiliary mass flow method for their fast numerical evaluation. We study the impact of these corrections on basic observables that are measured experimentally in the single-top production process.

AMFlow: a Mathematica package for Feynman integrals computation via Auxiliary Mass Flow

“…AMF method has already been used to study many physical processes [62,63,64,65,66,67,68,69]. Especially, equipped with the iterative strategy [57], this method becomes extremely powerful so that many Feynman integrals in cutting-edge problems, which are very challenging for other meth-ods, can be calculated (see Fig.…”

Automatic computation of Feynman integrals containing linear propagators via auxiliary mass flow

“…[59]). At the same time, the AMF method has already been used in many physical processes [61][62][63][64][65][66][67][68].…”

Non-factorisable two-loop contribution to $t$-channel single-top production

“…In these proceedings we give a brief summary of the calculation of the non-factorisable contribution to the two-loop helicity amplitude for t-channel single-top production presented recently in Ref. [1].…”

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We report on a recent computation of the non-factorisable contribution to the two-loop helicity amplitude for t-channel single-top production [1]. This is the last missing piece of the two-loop virtual corrections to this process.

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