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Measuring slepton masses and mixings at the LHC. (English) Zbl 1269.81211

Summary: Flavor physics may help us understand theories beyond the standard model. In the context of supersymmetry, if we can measure the masses and mixings of sleptons and squarks, we may learn something about supersymmetry and supersymmetry breaking. Here we consider a hybrid gauge-gravity supersymmetric model in which the observed masses and mixings of the standard model leptons are explained by a \(U(1)\times U(1)\) flavor symmetry. In the supersymmetric sector, the charged sleptons have reasonably large flavor mixings, and the lightest is metastable. As a result, supersymmetric events are characterized not by missing energy, but by heavy metastable charged particles. Many supersymmetric events are therefore fully reconstructible, and we can reconstruct most of the charged sleptons by working up the long supersymmetric decay chains. We obtain promising results for both masses and mixings, and conclude that, given a favorable model, precise measurements at the LHC may help shed light not only on new physics, but also on the standard model flavor parameters.

MSC:

81V22 Unified quantum theories
81T60 Supersymmetric field theories in quantum mechanics
81V15 Weak interaction in quantum theory
81V05 Strong interaction, including quantum chromodynamics
81R40 Symmetry breaking in quantum theory
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