TY - JOUR
T1 - Electroweak two-loop contribution to the mass splitting within a new heavy SU (2)L fermion multiplet
AU - Yamada, Youichi
PY - 2010/1/4
Y1 - 2010/1/4
N2 - 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).
AB - 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).
UR - http://www.scopus.com/inward/record.url?scp=72049089549&partnerID=8YFLogxK
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U2 - 10.1016/j.physletb.2009.11.044
DO - 10.1016/j.physletb.2009.11.044
M3 - Article
AN - SCOPUS:72049089549
SN - 0370-2693
VL - 682
SP - 435
EP - 440
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 4-5
ER -