Hidden fine tuning in the quark sector of little higgs models

Details Hidden fine tuning in the quark sector of little higgs models Hidden fine tuning in the quark sector of little higgs models

2009-04-10

arxiv.org/abs/0904.1622v1

JHEP 0909:040,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 1 figure

Scientific paper

10.1088/1126-6708/2009/09/040

In little higgs models a collective symmetry prevents the higgs from acquiring a quadratically divergent mass at one loop. By considering first the littlest higgs model we show that this requires a fine tuning: the couplings in the model introduced to give the top quark a mass do not naturally respect the collective symmetry. We show the problem is generic: it arises from the fact that the would be collective symmetry of any one top quark mass term is broken by gauge interactions.

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