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Lurking pseudovectors below the TeV scale.

Oscar Catà1

  • 1Fakultät für Physik, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333  Munich, Germany ; TUM-IAS, Lichtenbergstr. 2a, 85748  Garching, Germany ; Physik Department, TUM, 85748  Garching, Germany.

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Summary

New composite models for electroweak symmetry breaking can feature lighter spin-1 resonances. A light pseudovector resonance, coupled to Standard Model fields, evades precision data constraints, offering new collider signatures.

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Area of Science:

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

Background:

  • Electroweak symmetry breaking (EWSB) models with strongly coupled sectors predict bound states near the TeV scale.
  • Electroweak precision data severely constrains many existing EWSB models.
  • Conventional models often require heavy, nearly degenerate spin-1 resonances.

Purpose of the Study:

  • To investigate if spin-1 resonances in composite EWSB models can be lighter than current experimental bounds suggest.
  • To propose and analyze a composite model featuring a light pseudovector resonance.
  • To explore the phenomenological implications of such a light resonance for collider searches.

Main Methods:

  • Analysis of a composite model with a light pseudovector resonance.
  • Coupling the pseudovector resonance to Standard Model gauge bosons, fermions, and scalars.
  • Calculation of Next-to-Leading Order (NLO) corrections to Standard Model processes.
  • Assessment of constraints from electroweak precision data.

Main Results:

  • A light pseudovector resonance can exist without conflicting with electroweak precision data.
  • The proposed resonance has minimal impact on NLO corrections to Standard Model processes.
  • This scenario does not require fine-tuning of parameters.
  • The pseudovector resonance can be as light as 600 GeV and remains largely unconstrained.

Conclusions:

  • Composite models can accommodate lighter spin-1 resonances than previously thought.
  • The light pseudovector resonance presents a viable scenario for new physics beyond the Standard Model.
  • This resonance offers distinct signatures for direct detection at future colliders.