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Hadronic production of squark-squark pairs: the electroweak contributions. (English) Zbl 1291.81451
Summary: 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 \(\mathcal{O}\left( {{\alpha_s}\alpha + {\alpha^2}} \right)\), and next-to-leading order (NLO) EW corrections, of \(\mathcal{O}\left( {\alpha_s^2\alpha } \right)\), 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.
MSC:
81V22 Unified quantum theories
81T60 Supersymmetric field theories in quantum mechanics
81T15 Perturbative methods of renormalization applied to problems in quantum field theory
81T80 Simulation and numerical modelling (quantum field theory) (MSC2010)
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