Does the HyperCP evidence for the decay Σ+→pμ+μ- Indicate a light pseudoscalar higgs boson?

Xiao-Gang He, Jusak Tandean, G. Valencia

Research output: Contribution to journalArticleResearchpeer-review

54 Citations (Scopus)


The HyperCP Collaboration has observed three events for the decay Σ+→pμ+μ- which may be interpreted as a new particle of mass 214.3 MeV. However, existing data from kaon and B-meson decays provide stringent constraints on the construction of models that support this interpretation. In this Letter we show that the "HyperCP particle" can be identified with the light pseudoscalar Higgs boson in the next-to-minimal supersymmetric standard model, the A10. In this model there are regions of parameter space where the A10 can satisfy all the existing constraints from kaon and B-meson decays and mediate Σ+→pμ+μ- at a level consistent with the HyperCP observation.

Original languageEnglish
Article number081802
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 22 Feb 2007
Externally publishedYes

Cite this