A composite massless vector boson
arXiv:2002.08221 · doi:10.1103/PhysRevD.101.114506
Abstract
In a non-perturbative gauge-invariant formulation of grand-unified theories all low energy vector states need to be composite with respect to the high-scale gauge group, including the photon. We investigate this by using lattice methods to spectroscopically analyze the vector channel in a toy grand-unified theory, an SU(2) adjoint Higgs model. Our results support indeed the existence of a massless composite vector particle.
19 pages, 9 figures, v2: minor modifications, one figure added in the appendix