arXiv 0708.09372007-08hep-phhep-ex

U玻色子与HyperCP奇异事件

U-boson and the HyperCP exotic events

Chuan-Hung Chen, Chao-Qiang Geng, Chung-Wen Kao

备注：: 12 pages, 2 figures, refs. added, final version to appear in PLB
发表信息：: Phys.Lett.B663:400-404,2008
DOI：: 10.1016/j.physletb.2008.04.053

摘要：

在超对称标准模型推广的框架下，我们证明了额外$U(1)'$规范模型中自旋为1的超轻规范U玻色子是HyperCP实验所提出的新的轻粒子的一个很好的候选者.我们证明，味道改变中性电流（FCNC）的HyperCP事件的$Σ^{+}\to p μ^{+} μ^{-}$的衰变可以产生在树和循环水平。特别地，我们发现由于与5维电偶极算符的张量型相互作用而引起的环诱导的$s\to d U$跃迁对FCNC起着非常重要的作用。我们用自旋为1的U玻色子对HyperCP数据的解释与文献中基于轻赝标量希格斯玻色子玻色子或sgoldstino的解释不同。特别是，U玻色子涉及粒子物理学和宇宙学中丰富的现象学。

英文摘要：

We show that the very light spin-1 gauge U-boson of the extra $U(1)'$ gauge model in the framework of the supersymmetric standard model extension can be a good candidate of the new light particle suggested by the HyperCP experiment. We demonstrate that the flavor changing neutral currents (FCNCs) for the HyperCP events in the decay of $Σ^{+}\to p μ^{+} μ^{-}$ can be generated at both tree and loop levels. In particular, we find that the loop induced $s\to d U$ transition due to the tensor-type interaction with the dimension-5 electric dipole operator plays a very important role on the FCNCs. Our explanation of the HyperCP data with the spin-1 U-boson is different from that based on a light pseudoscalar Higgs boson or sgoldstino in the literature. In particular, the U-boson involves a rich phenomenology in particle physics as well as cosmology.

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