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High Energy Physics - Phenomenology

arXiv:1508.02419 (hep-ph)
[Submitted on 10 Aug 2015 (v1), last revised 21 Dec 2015 (this version, v3)]

Title:Mixed Stops and the ATLAS on-Z Excess

Authors:Jack H. Collins, Jeff Asaf Dror, Marco Farina
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Abstract:The ATLAS experiment has recently observed a 3-sigma excess in a channel with a leptonically decaying Z, jets, and ETmiss. It is tantalizing to interpret the signal as the first sign of a natural supersymmetric spectrum. We study such a possibility in a minimal model containing light stops and a neutralino LSP. The signal is characterized by a novel topology (compared to previous attempts) where the Z is emitted from a colored particle in the first step of a decay chain, namely t2 -> t1 Z which is characteristic of mixed stops. We show that the excess is compatible with a compressed stop spectrum and is not excluded by any other relevant search, finding some regions of parameter space with signal strength within 1-sigma of that measured by the ATLAS collaboration. In addition, we notice that the corresponding CMS search could be prone to background contamination in unexpected topologies of this kind.
Comments: 11 pages, 5 figures. v3: final revision with minor additions, matches the version published on PRD
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1508.02419 [hep-ph]
  (or arXiv:1508.02419v3 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1508.02419
Journal reference: Phys. Rev. D 92, 095022 (2015)
Related DOI: https://doi.org/10.1103/PhysRevD.92.095022

Submission history

From: Jeff Asaf Dror [view email]
[v1] Mon, 10 Aug 2015 20:36:10 UTC (181 KB)
[v2] Wed, 9 Sep 2015 21:50:23 UTC (178 KB)
[v3] Mon, 21 Dec 2015 16:34:02 UTC (221 KB)
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