Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-06-06
JHEP 0601 (2006) 135
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 9 figures. Minor corrections
Scientific paper
10.1088/1126-6708/2006/01/135
We compute the leading corrections to the properties of W and Z bosons induced at the one-loop level in the SU(5)/SO(5) Littlest Higgs model with T parity, and perform a global fit to precision electroweak data to determine the constraints on the model parameters. We find that a large part of the model parameter space is consistent with data. Values of the symmetry breaking scale as low as 500 GeV are allowed, indicating that no significant fine tuning in the Higgs potential is required. We identify a region within the allowed parameter space in which the lightest T-odd particle, the partner of the hypercharge gauge boson, has the correct relic abundance to play the role of dark matter. In addition, we find that a consistent fit to data can be obtained for large values of the Higgs mass, up to 800 GeV, due to the possibility of a partial cancellation between the contributions to the T parameter from Higgs loops and new physics.
Hubisz Jay
Meade Patrick
Noble Andrew
Perelstein Maxim
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