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Asymptotically Safe Standard Model via Vectorlike Fermions.

R B Mann1, J R Meffe1,2, F Sannino2,3,4

  • 1Department of Physics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.

Physical Review Letters
|January 13, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces asymptotically safe Standard Model extensions using vectorlike fermions. These models suggest gauge and Higgs couplings can reach an interacting ultraviolet fixed point, crucial for quantum field theory.

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Area of Science:

  • High Energy Physics
  • Quantum Field Theory
  • Beyond Standard Model Physics

Background:

  • The Standard Model (SM) of particle physics describes fundamental particles and forces but lacks a complete ultraviolet (UV) description.
  • Asymptotic safety is a proposed mechanism to achieve a consistent quantum field theory without Landau poles.

Purpose of the Study:

  • To construct extensions of the Standard Model that exhibit asymptotic safety.
  • To investigate the conditions under which gauge and Higgs couplings can reach an interacting UV fixed point.

Main Methods:

  • Introducing gauged vectorlike fermions into the Standard Model.
  • Employing large number-of-flavor techniques to analyze renormalization group flow.

Main Results:

  • Demonstrated that adding gauged vectorlike fermions can lead to asymptotically safe theories.
  • Showed that all gauge couplings, including hypercharge, can reach an interacting UV fixed point.
  • Identified conditions where the Higgs coupling also achieves an interacting UV fixed point.

Conclusions:

  • Asymptotically safe extensions of the Standard Model are constructible.
  • The inclusion of vectorlike fermions provides a viable mechanism for achieving UV completeness in particle physics models.