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Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Search for charged massive long-lived particles.

V M Abazov1, B Abbott, B S Acharya

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

Physical Review Letters
|May 1, 2012
PubMed
Summary
This summary is machine-generated.

Physicists searched for exotic massive long-lived particles (CMLLPs) at the Tevatron collider. The study excluded certain charginos and scalar top quarks, advancing beyond-standard-model physics searches.

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Area of Science:

  • Particle Physics
  • Beyond Standard Model Physics
  • Collider Physics

Background:

  • Charged Massive Long-Lived Particles (CMLLPs) are predicted by theories beyond the Standard Model.
  • These particles may exhibit distinct signatures from Standard Model particles at particle colliders.

Purpose of the Study:

  • To search for evidence of CMLLPs produced in proton-antiproton collisions.
  • To constrain the masses of hypothetical beyond-Standard-Model particles, specifically charginos and scalar top quarks.

Main Methods:

  • Analysis of 5.2 fb⁻¹ of integrated luminosity data collected by the D0 detector at the Fermilab Tevatron.
  • Identification of candidate events with particles reconstructed as muons but with anomalous speed and ionization energy loss (dE/dx).
  • Comparison of observed event rates with Standard Model background predictions.

Main Results:

  • Exclusion of pair-produced long-lived gaugino-like charginos with masses below 267 GeV at 95% confidence level.
  • Exclusion of pair-produced long-lived Higgsino-like charginos with masses below 217 GeV at 95% confidence level.
  • Exclusion of long-lived scalar top quarks with masses below 285 GeV at 95% confidence level.

Conclusions:

  • The search places stringent limits on the masses of certain CMLLPs, ruling out significant portions of parameter space for these hypothetical particles.
  • This study contributes to the ongoing experimental effort to uncover new physics phenomena beyond the Standard Model.