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Proceedings of The International Conference on Beyond Standard Model: From Theory To Experiment
Ultralight scalars, which are states that are either exactly massless or much lighter than any other massive particle in the model, appear in many new physics scenarios. Axions and majorons constitute wellmotivated examples of this type of particle. In this work, we explore the phenomenology of these states in low-energy leptonic observables adopting a model independent approach that includes both scalar and pseudoscalar interactions. Then, we consider processes in which the ultralight scalar φdoi:10.31526/acp.bsm-2021.22 fatcat:x2b4mrausjfdfp6mp35mcozvn4