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Constraining light colored particles with event shapes.

David E Kaplan1, Matthew D Schwartz

  • 1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

New analysis of Large Electron Positron Collider data sets strong bounds on new colored particles. This research rules out colored adjoint fermions, like gluinos, below 51.0 GeV, significantly improving previous limits.

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Area of Science:

  • High-energy particle physics
  • Quantum field theory

Background:

  • Event shape data from the CERN Large Electron Positron Collider (LEP) are crucial for testing the Standard Model.
  • Previous model-independent bounds on new colored particles were limited.

Purpose of the Study:

  • To derive stringent, model-independent bounds on new colored particles using advanced theoretical techniques.
  • To improve upon existing exclusion limits for hypothetical particles like gluinos.

Main Methods:

  • Utilizing soft-collinear effective theory (SCET) for event shape computations.
  • Analyzing event shape data, specifically thrust, from ALEPH and OPAL experiments.
  • Incorporating contributions of new colored particles to loop calculations within SCET.

Main Results:

  • New colored particles, such as gluinos, are constrained to be above 51.0 GeV at 95% confidence.
  • This represents a significant improvement, nearly an order of magnitude stronger than the previous bound of 6.3 GeV.
  • The effective field theory computation demonstrated sensitivity to new particle thresholds.

Conclusions:

  • The study provides the strongest model-independent bounds to date on new colored particles.
  • Experimental data from LEP, analyzed with SCET, effectively probes physics beyond the Standard Model.
  • The findings place significant restrictions on the existence of light gluinos.