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arXiv 1609.08987hep-exhep-ph
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通过$μ\,e$散射测量μ介子g-2的主导强子贡献

Measuring the leading hadronic contribution to the muon g-2 via $μ\,e$ scattering

G. Abbiendi, C. M. Carloni Calame, U. Marconi, C. Matteuzzi, G. Montagna, O. Nicrosini, M. Passera, F. Piccinini, R. Tenchini, L. Trentadue, G. Venanzoni

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8 pages, 4 figures
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摘要：

我们提出了一个新的实验来测量精细结构常数的运行在类空区通过散射高能μ子的原子电子的低Z目标通过过程$μe \to μe$。这个过程的微分截面，作为平方动量转移$t=q^2<0$的函数测量，提供了直接的灵敏度的领先阶强子贡献的μ子异常$a^{\rm{HLO}}_μ$。通过使用150 GeV的μ子束，平均速率为$\sim1.3\times 10^7$ μ子/s，目前在欧洲核子研究中心北区，$\sim 0.3\%$的统计不确定度可以实现在$a^{\rm{HLO}}_μ$经过两年的数据。这种对$a^{\rm{HLO}}_μ$的直接测量将提供一个独立的测定，与类时色散方法相竞争，并巩固了标准模型中μ子$g$ -2的理论预测。因此，它将允许一个更坚定的解释未来的μ子$g$ -2实验在费米实验室和J-PARC的测量。

英文摘要：

We propose a new experiment to measure the running of the fine-structure constant in the space-like region by scattering high-energy muons on atomic electrons of a low-Z target through the process $μe \to μe$. The differential cross section of this process, measured as a function of the squared momentum transfer $t=q^2<0$, provides direct sensitivity to the leading-order hadronic contribution to the muon anomaly $a^{\rm{HLO}}_μ$. By using a muon beam of 150 GeV, with an average rate of $\sim1.3\times 10^7$ muon/s, currently available at the CERN North Area, a statistical uncertainty of $\sim 0.3\%$ can be achieved on $a^{\rm{HLO}}_μ$ after two years of data taking. This direct measurement of $a^{\rm{HLO}}_μ$ will provide an independent determination, competitive with the time-like dispersive approach, and consolidate the theoretical prediction for the muon $g$-2 in the Standard Model. It will allow therefore a firmer interpretation of the measurements of the future muon $g$-2 experiments at Fermilab and J-PARC.

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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