What more can the LHC do?

Dr. Deepak Sathyan

Abstract: Fourteen years after the Higgs discovery, the LHC remains the premier energy-frontier experiment. Searches for SUSY and other heavy new particles have so far come up empty, but the LHC can also offer sensitivity complementary to the intensity frontier. I will discuss two classes of models, conventionally probed through rare processes, that the LHC can test directly.

The first is a model of baryon and lepton number violation with $\Delta B = -1$ and $\Delta L = -3$. Proton decay first arises at dimension 11, so existing bounds constrain the new physics scale only to about 10 TeV, within reach of the LHC. In an explicit realization, LHC searches can surpass Super-K limits and complement projected Hyper-K sensitivity.

The second is light mediators with visible or invisible decays. SM precision measurements such as the W boson mass simultaneously search for invisible new physics in the lepton plus missing energy final state. Sub-GeV dark photons are also produced abundantly, via proton bremsstrahlung in the calorimeters and associated production at the interaction point. Their dimuon and dielectron decays can be observed, covering parameter space that intensity-frontier experiments have not yet reached.