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arXiv 1402.7065hep-phhep-ex
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在LHC上检验μ介子g-2异常

Testing the Muon g-2 Anomaly at the LHC

Ayres Freitas, Joseph Lykken, Stefan Kell, Susanne Westhoff

摘要:

μ子反常磁矩$a_μ = (g_μ-2)/2$的实验测量值和标准模型预测值之间长期存在的差异,可以用新的弱相互作用粒子的存在来解释,这些粒子的质量只有几个100 GeV。这类粒子通常可以直接在LHC中产生,因此它们可能已经受到现有数据的限制。在这项工作中,我们调查$a_μ$和大型强子对撞机之间的这种连接在一个模型无关的方法,通过引入一个或两个新的领域超出了标准模型的自旋和弱同位旋高达1。对于每一种情况下,我们确定的首选参数空间解释的差异的a_mu和导出的界限使用数据从LEP和8-TeV的LHC运行。此外,我们估计如何这些限制可以改善与14 TeV的LHC。我们发现,8-TeV的结果已经排除了我们的简化模型的一个子集,而几乎所有可行的情况下,可以用14-TeV的数据进行最终测试。

英文摘要:

The long-standing difference between the experimental measurement and the standard-model prediction for the muon's anomalous magnetic moment, $a_μ = (g_μ-2)/2$, may be explained by the presence of new weakly interacting particles with masses of a few 100 GeV. Particles of this kind can generally be directly produced at the LHC, and thus they may already be constrained by existing data. In this work, we investigate this connection between $a_μ$ and the LHC in a model-independent approach, by introducing one or two new fields beyond the standard model with spin and weak isospin up to one. For each case, we identify the preferred parameter space for explaining the discrepancy of a_mu and derive bounds using data from LEP and the 8-TeV LHC run. Furthermore, we estimate how these limits could be improved with the 14-TeV LHC. We find that the 8-TeV results already rule out a subset of our simplified models, while almost all viable scenarios can be tested conclusively with 14-TeV data.

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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