Bounds on the Fermion-Bulk masses in models with universal extra dimensions

Gui Yu Huang, Kyoungchul Kong, Seong Chan Park

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


In models with extra dimensions, vectorlike Dirac masses for fermion fields are generically allowed. These masses are independent of electroweak symmetry breaking and do not contribute to the known masses for the quarks and leptons. They control the profile of the bulk wave functions, the mass spectra of Kaluza-Klein modes, and interactions that could be tested in experiments. In this article, we study the effects of bulk masses in electroweak precision measurements and in dark matter and collider searches, to set bounds on the bulk mass parameters in models with a flat universal extra dimension, namely, Split-UED. We find the current bound on the universal bulk-mass to be smaller than (0.2-0.3)/R, where R is the radius of the extra dimension. Similar but slightly relaxed bounds are obtained in the non-universal bulk mass case. The LHC is expected to play an important role in constraining the remaining parameter space.

Original languageEnglish
Article number99
JournalJournal of High Energy Physics
Issue number6
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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