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Technicolor explanation for the CDF Wjj excess.

Estia J Eichten1, Kenneth Lane, Adam Martin

  • 1Theoretical Physics Department, Fermi National Accelerator Laboratory, PO Box 500, Batavia, Illinois 60510, USA. eichten@fnal.gov

Physical Review Letters
|July 21, 2011
PubMed
Summary

A potential technipion (πT) particle may explain a W+jets anomaly observed at the Tevatron. This technicolor particle could be produced via a technirho resonance, prompting further searches at the Tevatron and LHC.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Beyond Standard Model Physics

Background:

  • An unexplained 3.2σ excess in the dijet mass spectrum of W+jets events was reported by the CDF collaboration.
  • This excess, observed around 150 GeV, suggests the potential presence of new physics beyond the Standard Model.

Purpose of the Study:

  • To propose that the observed W+jets anomaly is evidence for the technipion (πT) particle predicted by low-scale technicolor theories.
  • To explain the production mechanism and decay of this potential new particle.

Main Methods:

  • Interpreting the CDF dijet mass spectrum excess within the framework of technicolor.
  • Postulating the technipion (πT) as the source of the excess.
  • Proposing the technirho as a resonance decaying to W+technipion (WπT).

Main Results:

  • The technipion (πT) hypothesis provides a plausible explanation for the 3.2σ excess at ~150 GeV.
  • The relatively large cross-section is attributed to the production of a narrow technirho resonance decaying into WπT.
  • This interpretation offers a concrete candidate for new physics.

Conclusions:

  • The technicolor model, specifically the technipion (πT), offers a compelling explanation for the CDF W+jets anomaly.
  • Further theoretical and experimental investigations are warranted to confirm or refute this hypothesis.
  • Companion searches at the Tevatron and Large Hadron Collider (LHC) are suggested to strengthen the technicolor case.