ALPs Effective Field Theory and Collider Signatures

Understand

We study the leading effective interactions between the Standard Model fields and a generic singlet CP-odd (pseudo)Goldstone boson.

• Two possible frameworks for electroweak symmetry breaking are considered: linear and non-linear.
• For the latter case, the basis of leading effective operators is determined and compared with that for the linear expansion.
• Associated phenomenological signals at colliders are explored for both scenarios, deriving new bounds and analyzing future prospects, including LHC and High Luminosity LHC sensitivities.