Abstract
Abstract Motivated by hints for a light Standard Model-like Higgs boson and a shift in experimental attention towards electroweak supersymmetry particle production at the CERN LHC, we update in this paper our precision predictions at next-to-leading order of perturbative QCD matched to resummation at the next-to-leading logarithmic accuracy for direct gaugino pair production in proton-proton collisions with a center-of-mass energy of 8 TeV. Tables of total cross sections are presented together with the corresponding scale and parton density uncertainties for benchmark points adopted recently by the experimental collaborations, and figures are presented for up-to-date model lines attached to them. Since the experimental analyses are currently obtained with parton showers matched to multi-parton matrix elements, we also analyze the precision of this procedure by comparing invariant-mass and transverse-momentum distributions obtained in this way to those obtained with threshold and transverse-momentum resummation.
Highlights
JHEP10(2012)081 imply that the experimental attention shifts towards third-generation squarks and the weak production channels, in particular the direct production of gauginos
Motivated by hints for a light Standard Model-like Higgs boson and a shift in experimental attention towards electroweak supersymmetry particle production at the CERN LHC, we update in this paper our precision predictions at next-to-leading order of perturbative QCD matched to resummation at the next-to-leading logarithmic accuracy for direct gaugino pair production in proton-proton collisions with a center-of-mass energy of 8 TeV
An overview of the absolute size of the total cross sections at 8 TeV, the impact of the higher-order corrections, and the theoretical uncertainties can be obtained from the figures shown in section 2 illustrating the cross sections as a function of the physical gaugino mass along the model lines attached to the selected benchmark points
Summary
First SUSY search results at the LHC with an integrated luminosity of about 1 fb−1 of data excluded six out of the nine SPS benchmark points that had been in use since about a decade [36, 37]. We present in tables 4, 5, and 6 total production cross sections for various combinations of neutralino and chargino pairs in the context of the benchmark points 1, 18 and 31 introduced in section 2.1 at the leading and next-to-leading order of perturbative QCD as well as after matching the NLO results to threshold resummation. At LO, the factorization scale μF appearing within the evolution of the parton densities already induces large logarithmic terms yielding an uncertainty of about 10% on the cross section This effect is attenuated at NLO, but one gets an additional explicit dependence in the renormalization scale μR through the strong coupling constant and the loop contributions. Similar results are obtained for model lines 10.3 and 40.1 (not shown), as they have similar physical gaugino mass ranges
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
