NNLL resummation for stop pair-production at the LHC

TL;DR

This paper improves theoretical predictions for stop-antistop production at the LHC by including NNLL soft-gluon resummation, one-loop hard-matching, and two-loop Coulomb corrections, resulting in more accurate cross section estimates.

Contribution

It introduces NNLL resummation with additional loop corrections for stop pair-production, enhancing prediction precision over previous NLL calculations.

Findings

NNLL corrections increase cross section predictions at 8 and 13 TeV.

Enhanced dependence on stop-mixing parameters observed.

Improved theoretical accuracy for supersymmetric particle production.

Abstract

The production of supersymmetric stop-antistop pairs at the Large Hadron Collider (LHC) is studied including corrections from soft-gluon resummation up to next-to-next-to-leading logarithmic (NNLL) accuracy in the Mellin-space approach. Additionally, corrections to the hard-matching coefficient at one-loop and Coulomb contributions at two-loop order are considered. The NNLL corrections enhance the cross section for all stop masses at centre-of-mass energies of 8 and 13 TeV compared to the previously calculated predictions at next-to-leading logarithmic (NLL) accuracy. Furthermore, a slight increase in the dependence on the additional stop-mixing parameters is observed.