He Xiao-Gang, Tandean Jusak, Valencia G
Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan.
Phys Rev Lett. 2007 Feb 23;98(8):081802. doi: 10.1103/PhysRevLett.98.081802. Epub 2007 Feb 22.
The HyperCP Collaboration has observed three events for the decay Sigma+ -->p mu+mu- 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 Sigma+ -->p mu+mu- at a level consistent with the HyperCP observation.
超CP合作组观测到西格玛正（Σ⁺）衰变为质子（p）、渺子正（μ⁺）和渺子负（μ⁻）的三个事例，这可能被解释为质量为214.3兆电子伏特的一种新粒子。然而，来自K介子和B介子衰变的现有数据对支持这种解释的模型构建施加了严格限制。在本快报中我们表明，“超CP粒子”可与次最小超对称标准模型（A10）中的轻赝标希格斯玻色子相识别。在这个模型中，存在参数空间区域，其中A10能够满足来自K介子和B介子衰变的所有现有约束，并在与超CP观测一致的水平上介导Σ⁺→pμ⁺μ⁻衰变。
