Constraining the littlest Higgs

By J. Hewett, Frank Petriello, T. Rizzo. 2002

171 citations recorded by the source corpus.

Little Higgs models offer a new way to address the hierarchy problem, and give rise to a weakly-coupled Higgs sector. These theories predict the existence of new states which are necessary to cancel the quadratic divergences of the Standard Model. The simplest version of these models, the Littlest Higgs, is based on an SU(5)/SO(5) non-linear sigma model and predicts that four new gauge bosons, a weak isosinglet quark, t{prime}, with Q=2/3, as well as an isotriplet scalar field exist at the TeV scale. We consider the contributions of these new states to precision electroweak observables, and examine their production at the Tevatron. We thoroughly explore the parameter space of this model and find that small regions are allowed by the precision data where the model parameters take on their natural values. These regions are, however, excluded by the Tevatron data. Combined, the direct and indirect effects of these new states constrain the ''decay constant'' f {approx}> 3.5 TeV and m{sub t{prime}} {approx}> 10 TeV. These bounds imply that significant fine-tuning be present in order for this model to resolve the hierarchy problem.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics, Political Science and International Relations

View Paper: https://www.semanticscholar.org/paper/e76c620d93cea638ba0f82c9ee12cb8be889fe7e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

1. David Tucker-Smith
2. I. Low
3. M. Schmaltz
4. Hsin-Chia Cheng
5. C. Hill
6. E. Simmons
7. M. Perelstein
8. A. Falkowski

In Nuclear and High Energy Physics

1. David Tucker-Smith
2. I. Low
3. M. Schmaltz
4. Hsin-Chia Cheng
5. E. Simmons
6. C. Hill
7. Atlas Collaboration
8. Konstantin T. Matchev

In Political Science and International Relations

1. M. Schmaltz
2. David Tucker-Smith
3. I. Low
4. Hsin-Chia Cheng
5. C. Hill
6. E. Simmons

Citations in the corpus

• T parity and the littlest Higgs (2004, background): “There are many variants of the little Higgs models [13, 14, 15, 16, 17, 18], as well as some examples of UV extensions above 10 TeV [19, 20], and extensive phenomenological studies have been performed [21, 22, 23, 24, 25, 26, 27, 28, 29].”
• Little hierarchy, little higgses, and a little symmetry (2004, methodology): “The electroweak observables also receive contributions from the new TeV particles in little Higgs theories, and there have been several studies on this issue for various little Higgs models [19, 20, 21, 22, 23, 24, 25, 26, 27].”
• Strong dynamics and electroweak symmetry breaking (2002, methodology): “elop tadpole VEV’s and may violate Tcosntraints. Also, the models such as SU(5)/SO(5) employ a top seesaw to give to the top quark mass, and the extended fermion structure can be problematic in loops [535]. Some recent papers examine collider phenomenology of these schemes [536,537]. Much remains to”
• LITTLE HIGGS THEORIES (2005, background): “An even slightly stronger bound was obtained in [39], by combining indirect constraints with constraints from direct production of the heavy U(1) gauge boson at the Tevatron.”