Axion Searches at the LHC: FASER as a Light Shining through Walls Experiment

Abstract

We propose the use of FASER as a light-shining-through-walls experiment to search for axions. LHC collisions generate a high intensity and high energy photon flux in the forward direction which can oscillate into axions in the magnetic fields that are used to confine the beam. These axions then pass through about 100 m of rock before reaching the magnetic fields of FASER, where they can convert back into photons and be detected by an electromagnetic calorimeter. In the next years, FASER and its successor FASER2 at the Forward Physics Facility will be able to explore regions of the axion parameter space inaccessible by other laboratory-based experiments.

Dark Sector Studies with Neutrino Beams

“…[124] by taking sets of benchmark ALP production and detection parameters, not specifying concrete experiments. We also include the expected sensitivity reaches of LSW@FASER/FASER2 [288] and FLArE [288] for comparison.…”

Axion-like ALPs

“…Currently, an increasing experimental task force is being born aiming to set bounds on the several couplings of ALPs to both fermions and gauge bosons of the SM. Additionally, these particles and their couplings have been extensively studied in the literature [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], following an Effective Field Theory (EFT) approach. Our goal in this paper is to analyze this formulation, and identify promising benchmarks.…”