Journal article

The unnatural composite Higgs

James Barnard, Tony Gherghetta, Tirtha Sankar Ray, Andrew Spray



Abstract: Composite Higgs models can trivially satisfy precision-electroweak and flavour constraints by simply having a large spontaneous symmetry breaking scale, f ≳ 10 TeV. This produces a ‘split’ spectrum, where the strong sector resonances have masses greater than 10 TeV and are separated from the pseudo Nambu-Goldstone bosons, which remain near the electroweak scale. Even though a tuning of order 10−4 is required to obtain the observed Higgs boson mass, the big hierarchy problem remains mostly solved. Intriguingly, models with a fully-composite right-handed top quark also exhibit improved gauge coupling unification. By restricting ourselves to models which preserve these features we fin..

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University of Melbourne Researchers


Awarded by Department of Energy

Awarded by National Science Foundation

Funding Acknowledgements

We thank Alex Pomarol for helpful discussions. This work was supported by the Australian Research Council. TG was also supported by the Department of Energy grant DE-SC0011842. TG thanks the hospitality of the Aspen Center for Physics and the partial support from National Science Foundation Grant No. PHYS-1066293 during the completion of this work. JB is grateful to the Mainz Institute for Theoretical Physics (MITP) for its hospitality and partial support during the completion of this work. JB, TSR and AS thank the Fine Theoretical Physics Institute for partial support and hospitality during the completion of this work. TSR acknowledges the INSPIRE Faculty Grant, Department of Science and Technology, India.