Non-factorisable contribution to t-channel single-top production

Abstract

Abstract We compute the non-factorisable $$ \mathcal{O} $$ O ($$ {\alpha}_s^2 $$ α s 2 ) corrections to t-channel single-top quark production at the LHC. These peculiar corrections arise because of interactions between the heavy- and the light-quark lines and appear for the very first time at next-to-next-to-leading order in perturbative QCD. We find that the non-factorisable corrections change the single-top production cross section and the relevant kinematic distributions in this process by about half a percent.