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Setting Limits on Supersymmetry Using Simplified Models
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Published on: November 15, 2013

Search for resonant second generation slepton production at the Fermilab Tevatron.

V M Abazov1, B Abbott, M Abolins

  • 1Joint Institute for Nuclear Research, Dubna, Russia.

Physical Review Letters
|October 10, 2006
PubMed
Summary

Researchers searched for supersymmetry by analyzing R-parity violating smuon and sneutrino production. The results agree with the Standard Model, setting new limits on supersymmetry parameters.

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Area of Science:

  • Particle Physics
  • Supersymmetry Searches
  • High-Energy Physics

Background:

  • Supersymmetry (SUSY) is a theoretical extension of the Standard Model.
  • R-parity violation (RPV) provides a mechanism for SUSY particle interactions and decays.
  • Smuons and sneutrinos are hypothetical SUSY partners of the muon and muon neutrino.

Purpose of the Study:

  • To search for R-parity violating resonant production and decay of smuons and muon sneutrinos.
  • To probe SUSY parameter space not accessible by previous experiments.
  • To set limits on SUSY couplings and masses.

Main Methods:

  • Analysis of 0.38 fb(-1) of integrated luminosity data collected by the D0 detector at the Fermilab Tevatron Collider.
  • Searched for specific decay channels: smuon to neutralino plus muon, and sneutrino to charginos plus muon.
  • Calculated 95% confidence level (C.L.) limits on slepton production cross-sections and branching fractions.

Main Results:

  • Observed number of events is consistent with Standard Model background predictions.
  • Established 95% C.L. limits on the product of slepton production cross-section and branching fraction to gaugino plus muon.
  • Set limits on the RPV coupling parameter lambda(211)(') within the minimal supergravity framework.

Conclusions:

  • The search found no evidence for R-parity violating supersymmetry in the studied channels.
  • The results significantly extend previous limits from Run I of the Tevatron and the CERN LEP collider.
  • Constrains specific SUSY models and provides guidance for future searches.