NLL soft and Coulomb resummation for squark and gluino production at the LHC

• DOI: 10.1007/jhep06(2012)052
• Publication Date: 2012-06-08T21:29:35Z
• Authors: P. Falgari; C. Schwinn; C. Wever
• Keywords: Nuclear and High Energy Physics; Physics; ddc:530; FOS: Physical sciences; 530; 01 natural sciences; High Energy Physics - Experiment; High Energy Physics - Phenomenology; High Energy Physics - Experiment (hep-ex); High Energy Physics - Phenomenology (hep-ph); Supersymmetry Phenomenology; NLO Computations; 0103 physical sciences; info:eu-repo/classification/ddc/530

Abstract

We present predictions of the total cross sections for pair production of squarks and gluinos at the LHC, including the stop-antistop production process. Our calculation supplements full fixed-order NLO predictions with resummation of threshold logarithms and Coulomb singularities at next-to-leading logarithmic (NLL) accuracy, including bound-state effects. The numerical effect of higher-order Coulomb terms can be as big or larger than that of soft-gluon corrections. For a selection of benchmark points accessible with data from the 2010-2012 LHC runs, resummation leads to an enhancement of the total inclusive squark and gluino production cross section in the 15-30% range. For individual production processes of gluinos, the corrections can be much larger. The theoretical uncertainty in the prediction of the hard-scattering cross sections is typically reduced to the ±10% level.