The Limits of Custodial Symmetry

Details The Limits of Custodial Symmetry The Limits of Custodial Symmetry

2010-02-19

arxiv.org/abs/1002.3663v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 10 included figures. Talk presented by RSC at SCGT09 at Nagoya University on Dec. 9, 2010; this report is a shortene

Scientific paper

We introduce a toy model implementing the proposal of using a custodial symmetry to protect the Z b_L bbar_L coupling from large corrections. This "doublet-extended standard model" adds a weak doublet of fermions (including a heavy partner of the top quark) to the particle content of the standard model in order to implement an O(4) x U(1)_X = SU(2)_L x SU(2)_R x P_LR x U(1)_X symmetry in the top-quark mass generating sector. This symmetry is softly broken to the gauged SU(2)_L x U(1)_Y electroweak symmetry by a Dirac mass M for the new doublet; adjusting the value of M allows us to explore the range of possibilities between the O(4)-symmetric (M to 0) and standard-model-like (M to infinity) limits.

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