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Event Selection

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Search for Charginos Nearly Mass-Degenerate with the Lightest Neutralino

Part of the book series: Springer Theses ((Springer Theses))

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Abstract

The SM processes, especially \(W+\)jet events that naturally have large \(E_{\mathrm {T}}^{\mathrm {miss}}\), can result in final-state kinematics similar to that of the signal. Therefore, the signal events can not be enhanced by any kinematic selection requirements, and tight requirements on kinematics reduce the signal efficiency a lot. In this analysis, a dedicated topological trigger is developed to attain a higher signal efficiency. Kinematic selection criteria are applied to ensure a high trigger efficiency, and the vast majority of background events are removed by identifying a high-\(p_{\mathrm {T}}\) disappearing track in the event.

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Notes

  1. 1.

    Triggers used in this analysis are summarized in Sect. 4.1.

  2. 2.

    If the event has only one jet with \(p_{\mathrm {T}}>\) 45 GeV, \(\varDelta \phi _{\mathrm {min}}^{\mathrm {jet-}E_{\mathrm {T}}^{\mathrm {miss}}}\) is calculated using the leading jet only.

References

  1. ATLAS Collaboration, Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum and 20.3 fb\(^{-1}\) of \(\sqrt{s}\) = 8 TeV proton-proton collision data. CERN, Geneva (2013). ATLAS-CONF-2013-047

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  2. ATLAS Collaboration, JHEP 1310, 189 (2013)

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  3. ATLAS Collaboration, Performance of primary vertex reconstruction in proton-proton collisions at \(\sqrt{s}=7\) TeV in the ATLAS experiment. CERN, Geneva (2010). ATLAS-CONF-2010-069

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  4. ATLAS Collaboration, Eur. Phys. J. C73, 2304 (2013)

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  5. ATLAS Collaboration, Phys. Rev. D 88, 112006 (2013)

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Author information

Authors and Affiliations

  1. The University of Tokyo, Tokyo, Japan

    Shingo Kazama

Authors
  1. Shingo Kazama
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Correspondence to Shingo Kazama .

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Kazama, S. (2016). Event Selection. In: Search for Charginos Nearly Mass-Degenerate with the Lightest Neutralino. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55657-2_8

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