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arXiv 0902.0335hep-phphysics.atom-ph
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从原子宇称破坏精确确定电弱耦合及其对粒子物理的意义

Precision determination of electroweak coupling from atomic parity violation and implications for particle physics

S. G. Porsev, K. Beloy, A. Derevianko

摘要:

我们对铯原子的宇称破坏进行了高精度计算,与以前的评估相比,理论不确定性降低了两倍。我们结合以前的测量和我们的计算,提取了133 Cs核的弱电荷,Q_W = -73.16(29)_exp(20)_th。结果与基本粒子的标准模型(SM)一致。这是迄今为止对SM的低能电弱部分进行的最准确的测试。结合高能对撞机实验的结果,我们证实了电弱力的能量依赖性(或“运行”)的能量范围跨越四个数量级(从~10 MeV到~100 GeV)。此外,我们的研究结果的限制,各种新的物理场景超出SM。特别是,我们增加了大统一和弦论模型预测的额外$Z$ -玻色子的质量下限。

英文摘要:

We carry out high-precision calculation of parity violation in cesium atom, reducing theoretical uncertainty by a factor of two compared to previous evaluations. We combine previous measurements with our calculations and extract the weak charge of the 133Cs nucleus, Q_W = -73.16(29)_exp(20)_th. The result is in agreement with the Standard Model (SM) of elementary particles. This is the most accurate to-date test of the low-energy electroweak sector of the SM. In combination with the results of high-energy collider experiments, we confirm the energy-dependence (or "running") of the electroweak force over an energy range spanning four orders of magnitude (from ~10 MeV to ~100 GeV). Additionally, our result places constraints on a variety of new physics scenarios beyond the SM. In particular, we increase the lower limit on the masses of extra $Z$-bosons predicted by models of grand unification and string theories.

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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