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arXiv 1402.3620hep-phhep-ex
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μ介子g-2、罕见的K介子衰变和暗玻色子的宇称破坏

Muon g-2, Rare Kaon Decays, and Parity Violation from Dark Bosons

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

摘要:

理论和实验之间μ介子g-2的差异可以用光矢量玻色子Z_d通过与光子的动力学混合耦合到电磁流来解释。我们举例说明了如果Z_d主要衰变为e+e-,μ + μ-,那么现有的电子g-2,π介子Dalitz衰变和其它直接产生数据是如何不利于这一解释的。一个占主导地位的不可见的Z_d衰变通道,如轻暗物质的影响,以及由此产生的强约束从罕见的K -> π +“丢失能量”衰变检查。如果考虑Z-Z_d质量混合引起的相消干涉效应,K衰减约束可以放宽。在这种情况下,我们表明,容纳μ子g-2的数据,通过放松K衰变约束导致有趣的信号暗宇称违反。作为一个例子,我们研究了在低Q^2下运行的弱混合角的变化,这在极化电子散射或原子物理学实验中可能是可观察到的。

英文摘要:

The muon g-2 discrepancy between theory and experiment may be explained by a light vector boson Z_d that couples to the electromagnetic current via kinetic mixing with the photon. We illustrate how the existing electron g-2, pion Dalitz decay, and other direct production data disfavor that explanation if the Z_d mainly decays into e+e-, mu+mu-. Implications of a dominant invisible Z_d decay channel, such as light dark matter, along with the resulting strong bounds from the rare K -> pi + 'missing energy' decay are examined. The K decay constraints may be relaxed if destructive interference effects due to Z-Z_d mass mixing are included. In that scenario, we show that accommodating the muon g-2 data through relaxation of K decay constraints leads to interesting signals for dark parity violation. As an illustration, we examine the alteration of the weak mixing angle running at low Q^2, which can be potentially observable in polarized electron scattering or atomic physics experiments.

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