Spectroscopy of SU(4) composite Higgs theory with two distinct fermion representations
Venkitesh Ayyar (Department of Physics, University of Colorado, Boulder, Colorado 80309, USA); Thomas DeGrand (Department of Physics, University of Colorado, Boulder, Colorado 80309, USA); Maarten Golterman (Department of Physics and Astronomy, San Francisco State University, San Francisco, California 94132, USA); Daniel C. Hackett (Department of Physics, University of Colorado, Boulder, Colorado 80309, USA); William I. Jay (Department of Physics, University of Colorado, Boulder, Colorado 80309, USA); et al - Show all 8 authors
We have simulated the SU(4) lattice gauge theory coupled to dynamical fermions in the fundamental and two-index antisymmetric (sextet) representations simultaneously. Such theories arise naturally in the context of composite Higgs models that include a partially composite top quark. We describe the low-lying meson spectrum of the theory and fit the pseudoscalar masses and decay constants to chiral perturbation theory. We infer as well the mass and decay constant of the Goldstone boson corresponding to the nonanomalous U(1) symmetry of the model. Our results are broadly consistent with large- scaling and vector-meson dominance.
