Soft gluon resummation for associated squark-electroweakino production at the LHC

We perform a threshold resummation calculation for the associated production of squarks and electroweakinos at the LHC to the next-to-leading logarithmic (NLL) accuracy. Analytical results for the process-dependent soft anomalous dimension and the hard matching coefficient are presented. The resummed results are matched to fixed-order predictions at next-to-leading order (NLO) in QCD, which are generalised to scenarios with non-universal squark masses and mixings. Numerically, the NLL contributions increase the total NLO cross section by 2% to 6% for squark masses ranging from 1 TeV to 3 TeV, respectively, and they reduce the dependence of the predictions on the factorisation and renormalisation scales from typically +/- 10% to below +/- 5%. Our NLO and NLO+NLL calculations have been implemented in the publicly available program RESUMMINO.

Automated summary

In this study, we performed a threshold resummation calculation for the associated production of squarks and electroweakinos at the LHC with high accuracy. Our numerical results show that the NLL contributions increase the total cross section and reduce the dependence on factorization and renormalization scales.