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High Energy Physics - Phenomenology

arXiv:1302.3231 (hep-ph)
[Submitted on 13 Feb 2013 (v1), last revised 2 May 2013 (this version, v2)]

Title:Top Squark Searches Using Dilepton Invariant Mass Distributions and Bino-Higgsino Dark Matter at the LHC

Authors:Bhaskar Dutta, Teruki Kamon, Nikolay Kolev, Kuver Sinha, Kechen Wang, Sean Wu
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Abstract:Pair production of light top squarks at the 8-TeV LHC can be used to probe the gaugino-Higgsino sector of the Minimal Supersymmetric Standard Model. The case where the lightest neutralino is a mixture of Bino and Higgsino, satisfying the thermal dark matter relic density, is investigated. In such a scenario, the lightest top squark decays mostly into $(i)$ a top quark plus the second or third lightest neutralino, and $(ii)$ a bottom quark plus the lightest chargino, instead of a decay scenario of the lightest top squark into a top quark and the lightest neutralino. Final states with $\geq 2$ jets, dileptons, and missing energy are expected in a subsequent decay of the second or third lightest neutralinos into the lightest neutralino via an intermediate slepton ("light sleptons" case) or $Z$ boson ("heavy sleptons" case). The opposite-sign same flavor dilepton mass distribution after subtracting the opposite-sign different flavor distribution shows a clear edge in the case of light sleptons. The significance for discovering such a scenario is calculated with optimized cuts in both light and heavy sleptons cases.
Comments: 6 pages, 3 figures. Version accepted in Phys. Rev. D
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1302.3231 [hep-ph]
  (or arXiv:1302.3231v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1302.3231
Related DOI: https://doi.org/10.1103/PhysRevD.87.095007

Submission history

From: Kuver Sinha [view email]
[v1] Wed, 13 Feb 2013 21:01:07 UTC (32 KB)
[v2] Thu, 2 May 2013 19:17:01 UTC (33 KB)
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