Abstract
In the NMSSM, a light CP-odd Higgs arises due to spontaneous breaking of approximate symmetries such as Peccei-Quinn or R-symmetry and is motivated by string theory. The case when it is heavier than two muons is well studied and constrained. We analyze various meson decay, g − 2, beam dump and reactor bounds on the CP-odd Higgs with mass below the muon threshold, in particular, addressing the question how light a CP-odd Higgs can be. We find that it has to be heavier than 210 MeV or have couplings to fermions 4 orders of magnitude below those of the Standard Model Higgs. Our analysis applies more generally to couplings of a light pseudoscalar to matter.
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Andreas, S., Lebedev, O., Ramos-Sánchez, S. et al. Constraints on a very light CP-odd Higgs of the NMSSM and other axion-like particles. J. High Energ. Phys. 2010, 3 (2010). https://doi.org/10.1007/JHEP08(2010)003
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DOI: https://doi.org/10.1007/JHEP08(2010)003