Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector
A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed wit...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2014
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/106598 http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC4370855&blobtype=pdf |
| Aporte de: |
| Sumario: | A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at √s = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb−1. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t ˜ 2) followed by the decay to the lighter top squark state (t ˜ 1) via t ˜ 2 → Zt ˜ 1, and for t ˜ 1 pair production in natural gaugemediated supersymmetry breaking scenarios where the neutralino (χ˜ 0 1 ) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G˜ ) via the χ˜ 0 1 → ZG˜ process. |
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