Constraints on a very light CP-odd Higgs of the NMSSM and other axion-like particles

Details Constraints on a very light CP-odd Higgs of the NMSSM and other axion-like particles Constraints on a very light CP-odd Higgs of the NMSSM and other axion-like particles

2010-05-21

arxiv.org/abs/1005.3978v2

JHEP 1008:003,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 4 figures; v2: references added, matches version published in JHEP

Scientific paper

10.1007/JHEP08(2010)003

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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