Abstract
We present updated predictions for the cross sections for pair production of squarks and gluinos at the LHC Run II. First of all, we update the calculations based on NLO+NLL partonic cross sections by using the NNPDF3.0NLO global analysis. This study includes a full characterization of theoretical uncertainties from higher orders, PDFs and the strong coupling. Then we explore the implications for this calculation of the recent NNPDF3.0 PDFs with NLO+NLL threshold resummation. We find that the shift in the results induced by the threshold-improved PDFs is within the total theory uncertainty band of the calculation based on NLO PDFs. However, we also observe that the central values of the NLO+NLL cross sections are modified both in a qualitative and a quantitative way, illustrating the relevance and impact of using threshold-improved PDFs together with resummed partonic cross sections. The updated NLO+NLL cross sections based on NNPDF3.0NLO are publicly available in the NLL-fast format, and should be an important ingredient for the interpretation of the searches for supersymmetric particles at Run II.
Highlights
Introduction and motivationThe next-to-leading order (NLO) QCD corrections to the total cross sections for squark and gluino pair production were first computed in [11,12,13]
We show the K -factor Eq (4) determined from the DIS+DY+top fit Figure 8 is the main result of this work: for the first time we have performed a NLO+next-toleading logarithmic (NLL) calculation of supersymmetric particle pair production at hadron colliders accounting for the effects of threshold resummation both in the partonic cross sections and in the parton distribution functions (PDFs)
In this work we have presented updated NLO+NLL predictions for squark and gluino pair production at the LHC Run II obtained using the NNPDF3.0 NLO global fit
Summary
The next-to-leading order (NLO) QCD corrections to the total cross sections for squark and gluino pair production were first computed in [11,12,13]. A significant contribution to the QCD NLO corrections originates from soft-gluon emissions which dominate the region near the production threshold. In this region, the partonic center-of-mass energy sis close to the kinematic restriction for the on-shell production of these particles, i.e. s ≥ 4m2, with m being the average mass of the two produced particles. Soft-gluon corrections to squark and gluino pair production can be taken into account to all orders in perturbation theory either using threshold-resummation techniques in Mellin space [29,30,31,32] or in the framework of effective theories [33,34]
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