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Updated: Apr 25, 2026
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Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
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Light nondegenerate squarks at the LHC
Rakhi Mahbubani1, Michele Papucci2, Gilad Perez3
1Theory Division, CERN, 1211 Geneva 23, Switzerland.
Physical Review Letters
|August 29, 2014
Summary
New research challenges previous assumptions about squark masses. By relaxing universality constraints, the study reveals significantly weaker bounds on squarks, allowing for lighter particles in certain scenarios.
Area of Science:
- Particle Physics
- Supersymmetry Searches
- High-Energy Physics
Background:
- Current experimental bounds on squarks assume mass degeneracy, constraining them to be heavier than ~1.4 TeV.
- This degeneracy assumption is not supported by theories like Minimal Flavor Violation (MFV) or supersymmetric alignment models.
Purpose of the Study:
- To reinterpret existing CMS data by relaxing squark-mass universality.
- To investigate the impact of deviations from U(2) universality on squark mass bounds.
Main Methods:
- Reinterpretation of a CMS multijet plus missing energy search.
- Analysis of scenarios with non-universal squark masses.
Main Results:
- Significantly weakened experimental bounds on squarks.
- Allowed masses for second-generation squark singlets as low as 400 GeV.
- In MFV scenarios, down-type squark singlets can be as light as 600 GeV.
Conclusions:
- The assumption of universal squark masses leads to overly stringent bounds.
- Deviations from U(2) universality allow for lighter squarks than previously thought.
- Future searches should consider non-universal squark mass scenarios.
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