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
Journal Article
·
· European Physical Journal. C, Particles and Fields
Here, 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 ($$\sim\atop{t}_2$$) followed by the decay to the lighter top squark state ($$\sim\atop{t}_1$$) via $$\sim\atop{t}_2$$ → Z$$\sim\atop{t}_1$$, and for $$\sim\atop{t}_1$$ pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino ($$\sim\atop{χ}$$$$0\atop{1}$$) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino ($$\sim\atop{G}$$) via the $$\sim\atop{χ}$$$$0\atop{1}$$ → Z G process.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1409411
- Alternate ID(s):
- OSTI ID: 22260256
OSTI ID: 1149136
- Journal Information:
- European Physical Journal. C, Particles and Fields, Journal Name: European Physical Journal. C, Particles and Fields Journal Issue: 6 Vol. 74; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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