Electroweak two-loop contribution to the mass splitting within a new heavy SU (2)L fermion multiplet

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23 Citations (Scopus)

Abstract

New heavy particles in an SU (2)L multiplet, sometimes introduced in extensions of the standard model, have highly degenerate tree-level mass M if their couplings to the Higgs bosons are very small or forbidden. However, loop corrections may generate the gauge-symmetry-breaking mass splitting within the multiplet, which does not vanish in the large M limit due to the threshold singularity. We calculate the electroweak contribution to the mass splitting for a heavy fermion multiplet, to the two-loop order. Numerically, two-loop electroweak contributions are typically O (MeV).

Original languageEnglish
Pages (from-to)435-440
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume682
Issue number4-5
DOIs
Publication statusPublished - 2010 Jan 4

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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