Soft-gluon resummation for squark and gluino hadroproduction

TL;DR

Soft-gluon emissions near partonic threshold significantly affect squark and gluino hadroproduction cross sections. The authors perform next-to-leading-logarithmic (NLL) threshold resummation within the MSSM, deriving analytical soft anomalous-dimension matrices and leading-order cross sections in a colour-basis framework, then match to NLO to obtain NLL+NLO predictions. The results show sizable corrections (up to ~35-40%) and reduced scale uncertainty, especially for gluino-involving final states at the Tevatron and LHC, improving the reliability of SUSY cross sections used in searches. Overall, the work provides more accurate predictions to interpret collider data and extract sparticle masses.

Abstract

We consider the resummation of soft gluon emission for squark and gluino hadroproduction at next-to-leading-logarithmic (NLL) accuracy in the framework of the minimal supersymmetric standard model. We present analytical results for squark-squark and squark-gluino production and provide numerical predictions for all squark and gluino pair-production processes at the Tevatron and at the LHC. The size of the soft-gluon corrections and the reduction in the scale uncertainty are most significant for processes involving gluino production. At the LHC, where the sensitivity to squark and gluino masses ranges up to 3 TeV, the corrections due to NLL resummation over and above the NLO predictions can be as high as 35% in the case of gluino-pair production, whereas at the Tevatron, the NLL corrections are close to 40% for squark-gluino final states with sparticle masses around 500 GeV.