The Plan B Model: $Z^{\prime }$ collider phenomenology and discovery prospects

Abstract

The Plan B Model was proposed by Allanach et al. (2023) and explains some gross features of the fermion mass spectrum. It also affects the predictions of various observables involving the $b\to s$ quark-flavour transition. The model predicts a new TeV-scale $Z^{\prime }$ which decays into various different final states. We constrain the viable parameter space of the model by re-casting several LHC direct searches for the $Z^{\prime }$ in addition to using Contur to test the model against unfolded measurements of various differential cross sections that are predicted to be non-zero in the Standard Model. We delineate the regions of parameter space that are excluded by current LHC data, and estimate the projected reach of the high luminosity LHC.

23 pages, 3 figures