# Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in sqrt(s)=8 TeV pp collisions with the ATLAS detector

Abstract : 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 $\sqrt{s}=8$ 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 ($\tilde{t}_2$) followed by the decay to the lighter top squark state ($\tilde{t}_1$) via $\tilde{t}_2 \to Z\tilde{t}_1$, and for $\tilde{t}_1$ pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino ($\tilde{\chi}^0_1$) is the next-to-lightest supersymmetric particle and decays producing a $Z$ boson and a gravitino ($\tilde{G}$) via the $\tilde{\chi}^0_1 \to Z\tilde{G}$ process.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00962437
Contributor : Sabine Starita <>
Submitted on : Friday, March 21, 2014 - 12:04:34 PM
Last modification on : Thursday, June 17, 2021 - 3:48:53 AM

### Citation

G. Aad, S. Abdel Khalek, E. Augé, A. Bassalat, C. Becot, et al.. Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in sqrt(s)=8 TeV pp collisions with the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2014, 74, pp.2883. ⟨10.1140/epjc/s10052-014-2883-6⟩. ⟨in2p3-00962437⟩

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