Speaker
Mr
Chris Wever
(ITF Utrecht University)
Description
We present predictions of the total production cross sections of pairs of squarks and gluinos at the LHC, which incorporate a combined resummation of soft logarithms and Coulomb singularities, including bound-state contributions. These terms dominate the threshold region of the partonic cross section and are resummed directly in momentum space using an effective-theory framework based on SCET and pNRQCD. This differs from the more conventional approach where soft logarithms are exponentiated in Mellin-moment space. The combined resummation of soft and Coulomb corrections can lead to much bigger effects than soft resummation alone, with corrections of up to 150% to the fixed-order NLO result for gluino-gluino production at 8 TeV, and smaller (but still sizeable) effects for the other production processes. The theoretical uncertainty of the cross sections is typically reduced to about \pm 10%. The finite widths of the squarks and gluinos have a small, negligible effect on the soft and Coulomb corrections of the total SUSY production cross section.
Primary authors
Mr
Chris Wever
(ITF Utrecht University)
Mr
Christian Schwinn
(University of Freiburg)
Mr
Pietro Falgari
(ITF Utrecht University)
