Decays of the Littlest Higgs Z_H and the Onset of Strong Dynamics

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dc.creatorBoersma, John
dc.creatorWhitbeck, Andrew
dc.date2007-10-25
dc.date.accessioned2026-07-07T11:12:36Z
dc.date.available2026-07-07T11:12:36Z
dc.descriptionThe Little Higgs mechanism, as realized in various models, requires a set of new massive gauge bosons, some of which mix with gauge bosons of the Standard Model. For a range of mixing angles the coupling of gauge bosons to scalars can become strong, ultimately resulting in a breakdown of perturbative calculation. This phenomenon is studied in the Littlest Higgs model, where the approach to strong dynamics is characterized by increasing tree-level decay widths of the neutral Z_H boson to lighter gauge bosons plus multiple scalars. These increasing widths suggest a distinctive qualitative collider signature for the approach to the strong coupling regime of large Higgs and other scalar multiplicities. In this work we catalog the kinematically allowed three-body decays of the Z_H, and calculate the partial width of the process Z_H to Z_L H H. This partial width is found to be larger than the comparable two-body decay Z_H to Z_L H for values of the SU(2) mixing angle cosine(theta) less than 0.13, indicating divergence of the littlest Higgs sigma field expansion at values of cosine(theta) larger than a simple parametric calculation would suggest. Additionally, we present analytical expressions for all two-body decays of the Littlest Higgs Z_H gauge boson, including the effects of all final-state masses.
dc.identifierhttps://arxiv.org/abs/0710.4874
dc.identifierhttp://arxiv.org/abs/0710.4874
dc.identifierPhys.Rev.D77:055012,2008
dc.identifierdoi:10.1103/PhysRevD.77.055012
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191437
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDecays of the Littlest Higgs Z_H and the Onset of Strong Dynamics
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