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首页> 外文期刊>Physical review, D >Precision measurement of the hadronic contribution to the muon anomalous magnetic moment
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Precision measurement of the hadronic contribution to the muon anomalous magnetic moment

机译：对μ子异常磁矩的幂态贡献的精确测量

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We report on a precision measurement of the cross section for the reaction e + e ? → π + π ? in the mass range 0.30 < M π π < 1.00 ? ? GeV / c 2 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 π π < 1.00 ? ? GeV / c 2 for the process e + e ? → π + π ? are determined with a statistical uncertainty of 0.7% and a systematic uncertainty of 1.6%. The leading-order hadronic contribution to the muon anomalous magnetic moment calculated using these measured e + e ? → π + π ? cross sections in the range M π π = 0.30 to 1.00 ? ? GeV / c 2 is calculated to be ( 500.6 ± 3.6 ( stat ) ± 8.0 ( syst ) ) × 10 ? 10 .
机译：我们报告了反应E + E的横截面的精确测量？ →π+π？ 在质量范围内0.30

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