Radiative corrections to masses and couplings in universal extra dimensions

  • Ayres FreitasEmail author
  • Kyoungchul Kong
  • Daniel Wiegand
Open Access
Regular Article - Theoretical Physics


Models with an orbifolded universal extra dimension receive important loop-induced corrections to the masses and couplings of Kaluza-Klein (KK) particles. The dominant contributions stem from so-called boundary terms which violate KK number. Previously, only the parts of these boundary terms proportional to ln(ΛR) have been computed, where R is the radius of the extra dimension and Λ is cut-off scale. However, for typical values of ΛR ∼ 10 · · · 50, the logarithms are not particularly large and non-logarithmic contributions may be numerically important. In this paper, these remaining finite terms are computed and their phenomenological impact is discussed. It is shown that the finite terms have a significant impact on the KK mass spectrum. Furthermore, one finds new KK-number violating interactions that do not depend on ln(ΛR) but nevertheless are non-zero. These lead to new production and decay channels for level-2 KK particles at colliders.


Phenomenology of Field Theories in Higher Dimensions NLO Computations 


Open Access

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  • Ayres Freitas
    • 1
    Email author
  • Kyoungchul Kong
    • 2
  • Daniel Wiegand
    • 1
  1. 1.Pittsburgh Particle-physics Astro-physics & Cosmology Center (PITT-PACC), Department of Physics & AstronomyUniversity of PittsburghPittsburghU.S.A.
  2. 2.Department of Physics and AstronomyUniversity of KansasLawrenceU.S.A.

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