Journal
PHYSICS LETTERS B
Volume 682, Issue 4-5, Pages 435-440Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2009.11.044
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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). (C) 2009 Elsevier B.V. All rights reserved.
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