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arXiv 0704.1981hep-exnucl-ex
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改进的正μ子寿命测量和费米常数测定

Improved Measurement of the Positive Muon Lifetime and Determination of the Fermi Constant

MuLan Collaboration, D. B. Chitwood, T. I. Banks, M. J. Barnes, S. Battu, R. M. Carey, S. Cheekatmalla, S. M. Clayton, J. Crnkovic, K. M. Crowe, P. T. Debevec, … 展开作者

MuLan Collaboration, D. B. Chitwood, T. I. Banks, M. J. Barnes, S. Battu, R. M. Carey, S. Cheekatmalla, S. M. Clayton, J. Crnkovic, K. M. Crowe, P. T. Debevec, S. Dhamija, W. Earle, A. Gafarov, K. Giovanetti, T. P. Gorringe, F. E. Gray, M. Hance, D. W. Hertzog, M. F. Hare, P. Kammel, B. Kiburg, J. Kunkle, B. Lauss, I. Logashenko, K. R. Lynch, R. McNabb, J. P. Miller, F. Mulhauser, C. J. G. Onderwater, C. S. Ozben, Q. Peng, C. C. Polly, S. Rath, B. L. Roberts, V. Tishchenko, G. D. Wait, J. Wasserman, D. M. Webber, P. Winter, P. A. Zolnierczuk

摘要:

正μ子的平均寿命已被测量到11 ppm的精度,使用低能量,脉冲μ子束停止在铁磁靶,这是由闪烁体探测器阵列包围。结果τ_mu = 2.197013(24)us,与以前的世界平均值非常一致。新的世界平均值τ_mu = 2.197019(21)us决定了费米常数G_F = 1.166371(6)x 10^-5 GeV^-2(5 ppm)。此外,还需要精确测量正μ子寿命来确定核子赝标耦合g_P。

英文摘要:

The mean life of the positive muon has been measured to a precision of 11 ppm using a low-energy, pulsed muon beam stopped in a ferromagnetic target, which was surrounded by a scintillator detector array. The result, tau_mu = 2.197013(24) us, is in excellent agreement with the previous world average. The new world average tau_mu = 2.197019(21) us determines the Fermi constant G_F = 1.166371(6) x 10^-5 GeV^-2 (5 ppm). Additionally, the precision measurement of the positive muon lifetime is needed to determine the nucleon pseudoscalar coupling g_P.

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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