Abstract:We compute the electroweak (EW) contributions to squark-squark pair production processes at the LHC within the framework of the Minimal Supersymmetric Standard Model (MSSM). Both tree-level EW contributions, of O(α s α + α 2 ), and next-to-leading order (NLO) EW corrections, of O(α 2 s α), are calculated. Depending on the flavor and chirality of the produced squarks, many interferences between EW-mediated and QCD-mediated diagrams give non-zero contributions at tree-level and NLO. We discuss the computational techniques and present an extensive numerical analysis for inclusive squark-squark production as well as for subsets and single processes. While the tree-level EW contributions to the integrated cross sections can reach the 20% level, the NLO EW corrections typically lower the LO prediction by a few percent.
In particular we present the first complete computation of the NLO EW corrections to diagonal sbottom-anti-sbottom pair production,The contribution of the remaining processes is small (cf. Section 5), hence we will not include them in our discussion on the EW corrections. The process (1.2) exhibits specific features like the mixing between left-and right-handed b-squarks, the renormalization of the sbottom sector [37,38], the non-negligible Higgs-boson contributions, and the enhanced Yukawa couplings for large values of tan β with the related need of resummation [39]. These features make the computations of the electroweak contributions to the processes (1.2) * 1 production at the 14 TeV LHC within the SPS1a ′ scenario. Shown are the tree-level and NLO EW cross section contributions for the various production channels (left) and the impact of the NLO EW contributions relative to the LO QCD cross section (right). In the left panels the tree-level and NLO EW contributions for the qq channel are plotted separately. In the right panels they are treated inclusively.
We present a complete next-to-leading order study of top-squark pair production at the LHC, including QCD and EW corrections. The calculation is performed within the Minimal Supersymmetric Standard Model and numerical results are presented for parameter regions compatible with the observed Higgs boson. We employ the most recent parton distribution functions including QED corrections and we find NLO EW corrections to the inclusive stop-pair production cross section up to 25-30% compared to the leadingorder prediction. Besides corrections to inclusive cross sections also important kinematic distributions are investigated.
We present the tree-level and next-to-leading order (NLO) electroweak (EW) contributions to squark-squark production at the Large Hadron Collider (LHC) within the framework of the Minimal Supersymmetric Standard Model (MSSM).The on-shell scheme is used to renormalize the masses and the wave functions of the quarks, squarks and gluinos [6,7]. The strong coupling constant is renormalized in the MS scheme with five flavor running of α s . SUSY Slavnov-Taylor identities are restored by adding a proper counterterm for the squark-quark-gluino coupling [8,9].
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