Speaker
Description
The established $d=5$ ALP effective Lagrangian describes scalars with approximate shift-symmetry, which carry no Standard Model charges. It implicitly assumes that ALPs are not charged under any symmetries of the dark sector. In this talk, we remove this assumption. In this case, no $d=5$ ALP effective interaction with SM particles is possible. We build the effective Lagrangian for these darkly charged ALPs, and show that the lowest-order shift-symmetric effective Lagrangian contains just two $d=6$ operators coupling ALPs to SM particles.
We then explore the model-independent phenomenological implications of these interactions, as well as the question of whether the dark matter observed in the Universe consists of darkly charged ALPs. Finally, we discuss how the CCWZ construction can be used to identify higher order operators of the effective field theory, and to determine which types of dark symmetry groups can seed darkly charged ALPs.
| Position | PhD student |
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