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

Allison, Lee and Barton, Adam and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Smizanska, Maria and Walder, James (2014) 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. European Physical Journal C: Particles and Fields, 74 (6). ISSN 1434-6044

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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 −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 gauge-mediated supersymmetry breaking scenarios where the neutralino ( χ~01) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino ( G~) via the χ~01→ZG~ process.

Item Type: Journal Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Additional Information: EPJC is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 69991
Deposited By: ep_importer_pure
Deposited On: 11 Jul 2014 23:04
Refereed?: Yes
Published?: Published
Last Modified: 24 Feb 2020 01:55
URI: https://eprints.lancs.ac.uk/id/eprint/69991

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