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Gluino-squark production at the LHC: the threshold

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Abstract

An analysis of the cross section for hadronic production of gluino-squark pairs close to threshold is presented. Within the framework of non-relativistic QCD a significant enhancement compared to fixed order perturbation theory is observed which originates from the characteristic remnants of the gluino-squark resonances below the nominal pair threshold. The analysis includes all colour configurations of S-wave gluino-squark pairs, i.e. triplet, sextet and 15 representation. Matching coefficients at leading order are separately evaluated for all colour configurations. The dominant QCD corrections, arising from initial- and final-state radiation are included. The non-relativistic dynamics of the gluino pair is solved by calculating the Green’s function in Next-to-Leading Order (NLO). The results are applied to benchmark scenarios, based on Snowmass Points and Slopes (SPS). As a consequence of the large decay rate of at least one of the constituents (squark or gluino), annihilation decays of the bound state \( \left( {\widetilde{g}\widetilde{q}} \right) \to gq \), qγ, qZ or q′W ± are irrelevant. Thus the signatures of gluino-quark production below and above the nominal threshold are identical. Numerical results for the cross section at the Large Hadron Collider (LHC) at \( \sqrt {s} = 7\;{\text{TeV}} \) and 14 TeV are presented. The enhancement of the total cross section through final state interaction amounts to roughly 3%.

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  1. Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), 76128, Karlsruhe, Germany

    Matthias R. Kauth, Achim Kress & Johann H. Kühn

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  1. Matthias R. Kauth
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Correspondence to Johann H. Kühn.

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ArXiv ePrint: 1108.0542

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Kauth, M.R., Kress, A. & Kühn, J.H. Gluino-squark production at the LHC: the threshold. J. High Energ. Phys. 2011, 104 (2011). https://doi.org/10.1007/JHEP12(2011)104

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