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arXiv 1507.00352hep-phhep-exnucl-ex
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低Q^2弱混合角测量与稀有Higgs衰变

Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays

Hooman Davoudiasl, Hye-Sung Lee, William J. Marciano

摘要:

从相对较低的Q^2实验中得到的加权平均弱混合角θ_W与从精密测量中得到的标准模型预测进行了比较。近似1.8 σ的差异与中等质量(~ 10-35 GeV)的“暗”Z玻色子Z_d相吻合,对应于隐藏的暗物质的U(1)_d规范对称性,它通过动力学和Z-Z_d质量混合与我们的世界耦合。对这种情况的限制是通过精确的电弱边界和在LHC上寻找稀有的Higgs衰变H -> ZZd-> 4带电轻子得到的。还举例说明了未来预期的sin^2 θ_W(Q^2)的低Q^2测量值对中等质量Z_d的敏感性。在接下来的几年里,这种暗Z场景可以在LHC的低能宇称违反测量和罕见的希格斯衰变中提供有趣的伴随信号。

英文摘要:

A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for the rare Higgs decays H -> Z Z_d -> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2 measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC, over the next few years.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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