TY - JOUR
T1 - Electroweak precision constraints on the littlest Higgs model with T parity
AU - Hubisz, Jay
AU - Meade, Patrick
AU - Noble, Andrew
AU - Perelstein, Maxim
N1 - Copyright:
Copyright 2006 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - 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 f 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.
AB - 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 f 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.
KW - Beyond Standard Model
KW - Higgs Physics
KW - LEP HERA and SLC Physics
KW - Technicolor and Composite Models
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U2 - 10.1088/1126-6708/2006/01/135
DO - 10.1088/1126-6708/2006/01/135
M3 - Article
AN - SCOPUS:33645498508
SP - 3441
EP - 3464
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1126-6708
IS - 1
ER -