Speaker
Description
Several models of grand unification predict the existence of an additional gauged $U(1)_D$ symmetry, which gives rise to a new heavy neutral gauge boson $Z'$ at the TeV scale. In general, the Standard Model particles may be charged under this new symmetry, with gauge coupling $g_D$, and the $Z'$ can exhibit a kinetic mixing $\epsilon$ with the hypercharge gauge boson as well. Future experiments, such as the High-Luminosity Large Hadron Collider (HL-LHC) and the Future Circular Collider (FCC), can constrain the values of $\epsilon$ and $g_D$ at the experimental scale. In this talk, I will describe how the bounds for HL-LHC and FCC can be derived within an effective field theory framework, while also highlighting their interplay with gauge coupling unification at the unification scale through renormalization group running.