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arXiv · 2607.18411

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

Ben Allanach·Hannah Banks·Jon Butterworth
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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 $b \rightarrow s$ 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.

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Ben Allanach, Hannah Banks, Jon Butterworth. 2026-07-20. The Plan B Model: $Z^{\prime}$ collider phenomenology and discovery prospects. https://arxiv.org/abs/2607.18411

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