Spectroscopy of the BSM sextet model
University of Wuppertal, Department of Physics, Wuppertal D-42097, Germany
2 Juelich Supercomputing Center, Forschungszentrum Juelich, Juelich D-52425, Germany
3 Eotvos University, Pazmany Peter setany 1/a, 1117 Budapest, Hungary
4 University of the Pacific, 3601 Pacific Ave, Stockton CA 95211, USA
5 University of California, San Diego, 9500 Gilman Drive, La Jolla CA 92093, USA
6 MTA-ELTE Lendulet Lattice Gauge Theory Research Group, Budapest 1117, Hungary
7 Universidad Autonoma, IFT UAM/CSIC and Departamento de Fisica Teorica, 28049 Madrid, Spain
Published online: 26 March 2018
As part of our ongoing lattice study of SU(3) gauge theory with two flavors of fermions in the two-index symmetric representation (the sextet model), we present the current status of the pseudoscalar particle spectrum. We use a mixed action approach based on the gradient flow to control lattice artifacts, allowing a simultaneous extrapolation to the chiral and continuum limits. We find strong evidence that the pseudoscalar is a Goldstone boson state, with spontaneously broken chiral symmetry and a non-zero Goldstone decay constant in the chiral limit. In agreement with our study of the gauge coupling β function, we find the sextet model appears to be a near-conformal gauge theory and serves as a prototype of the composite Higgs BSM template.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).