The framed standard model (FSM), constructed to explain, with some success, why there should be three and apparently only three generations of quarks and leptons in nature falling into a hierarchical mass and mixing pattern,¹⁰ suggests also, among other things, a scalar boson U, with mass around 17 MeV and small couplings to quarks and leptons,¹¹ which might explain⁹ the $g-2$ anomaly reported in experiment.¹² The U arises in FSM initially as a state in the predicted “hidden sector” with mass around 17$$MeV, which mixes with the standard model (SM) Higgs $h_W$, acquiring thereby a coupling to quarks and leptons and a mass just below 17$$MeV. The initial purpose of this paper is to check whether this proposal is compatible with experiment on semileptonic decays of Ks and Bs where the U can also appear. The answer to this we find is affirmative, in that the contribution of U to new physics as calculated in the FSM remains within the experimental bounds, but only if $m_U$ lies within a narrow range just below the unmixed mass. As a result from this, one has an estimate $m_U\sim 15$–17$$MeV for the mass of U, and from some further considerations the estimate ${\mathrm{\Gamma }}_U\sim 0.02$$$eV for its width, both of which may be useful for an eventual search for it in experiment. If found, it will be, for the FSM, not just the discovery of a predicted new particle, but the opening of a window into a whole “hidden sector” containing at least some, perhaps even the bulk, of the dark matter in the universe.

框架标准模型（FSM）的构建是为了解释为什么自然界中应该有三代，而且显然只有三代夸克和轻子落入分层质量和混合模式，并取得了一些成功，¹⁰还表明，除其他外，标量玻色子U，质量约为 17 MeV，与夸克和轻子的耦合较小，¹¹这可以解释⁹$G-2$实验中报告异常。¹² U最初出现在 FSM 中，作为预测的“隐藏扇区”中的一个状态，质量约为 17$$MeV，与标准模型 (SM) 希格斯混合$H_{瓦}$，从而获得夸克和轻子的耦合以及略低于 17 的质量$$兆伏。本文的最初目的是检查该提议是否与K s 和B s 的半轻衰变实验兼容，其中U也可以出现。我们发现这个问题的答案是肯定的，因为在 FSM 中计算的U对新物理的贡献仍然在实验范围内，但前提是${米}_U$位于未混合质量下方的狭窄范围内。由此看来，人们有一个估计${米}_U～15$–17$$MeV 的质量U，并从一些进一步的考虑估计${\mathrm{\gamma }}_U～0。02$$$eV 代表它的宽度，这两者都可能对最终在实验中搜索它有用。如果找到的话，对于有限状态机来说，这不仅是发现了预测的新粒子，而且还打开了一扇通向整个“隐藏扇区”的窗口，其中至少包含一些，甚至可能是大部分的暗物质。宇宙。