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
Name
Aad-2014-Search for direct to.pdf
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1.22 MB
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Checksum (MD5)
6e79fe23fc446b17dfb2f0835c1d0c29
Author(s)
Taylor, Frank E.
Date Issued
June 2014
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “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.” Eur. Phys. J. C 74, no. 6 (June 2014). © CERN for the benefit of the ATLAS collaboration
Version
Final published version
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 √s = 8\ TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb[superscript −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 ([~ over t][subscript 2]) followed by the decay to the lighter top squark state ([~ over t][subscript 1]) via [~ over t][subscript 2] →Z[~ over t][subscript 1], and for [~ over t][subscript 1] pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino ([~ over X[0 over 1]) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino ([~ over G]) via the [~ over X[0 over 1] → Z[~ over G] process.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-014-2883-6
