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arXiv 1712.04530hep-ex
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强子对μ子反常磁矩贡献的精确测量

Precision Measurement of the Hadronic Contribution to the Muon Anomalous Magnetic Moment

T. Xiao, S. Dobbs, A. Tomaradze, Kamal K. Seth, G. Bonvicini

摘要:

本文报道了用初态辐射(ISR)方法精确测量质量范围为$0.30<M_{ππ}<1.00$ GeV的$e^+e^-\toπ^+π^-$反应截面的结果。在$e^+e^-$质心能量为3.77 GeV时,$^{-1}$反应截面为817 pb;在$e^+e^-$质心能量为4.17 GeV时,$^{-1}$反应截面为586 pb。在康奈尔大学的CESR $e^+e^-$对撞机上用CLEO-c探测器收集。对于过程$e^+e^-\toπ^+π^-$,在$0.30<M_{ππ}<1.00$ GeV范围内的积分截面以$0.7\%$的统计不确定度和$1.5\%$的系统不确定度来确定。在$M_{ππ}=0.30$ ~ 1.00 GeV的范围内,用这些测量的$e^+e^-\toπ^+π^-$截面计算的μ子反常磁矩的首阶强子贡献为$(500.4\pm3.6 (\mathrm{stat})\pm 7.5(\mathrm{syst}))\times10^{-10}$ .

英文摘要:

We report on a precision measurement of the cross section for the reaction $e^+e^-\toπ^+π^-$ in the mass range $0.30<M_{ππ}<1.00$ GeV with the initial state radiation (ISR) method, using 817 pb$^{-1}$ of data at $e^+e^-$ center-of-mass energies near 3.77 GeV and 586 pb$^{-1}$ of data at $e^+e^-$ center-of-mass energies near 4.17 GeV, collected with the CLEO-c detector at the CESR $e^+e^-$ collider at Cornell University. The integrated cross sections in the range $0.30<M_{ππ}<1.00$ GeV for the process $e^+e^-\toπ^+π^-$ are determined with a statistical uncertainty of $0.7\%$ and a systematic uncertainty of $1.5\%$. The leading-order hadronic contribution to the muon anomalous magnetic moment calculated using these measured $e^+e^-\toπ^+π^-$ cross sections in the range $M_{ππ}=0.30$ to 1.00 GeV is calculated to be $(500.4\pm3.6 (\mathrm{stat})\pm 7.5(\mathrm{syst}))\times10^{-10}$.

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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