Precision measurement of the positive muon lifetime by the MuLan collaboration

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• 作者：V. Tishchenko^* ; the MuLan collaboration
• 关键词：Muon lifetime ; Fermi constant
• 刊名：Nuclear Physics B - Proceedings Supplements
• 出版年：2012
• 出版时间：April-June, 2012
• 年：2012
• 卷：225-227
• 期：Complete
• 页码：232-235
• 全文大小：331 K

文摘

We report the result of a measurement of the positive muon lifetime to one part-per-million (ppm) by the MuLan collaboration using a low-energy pulsed muon beam and a segmented array of plastic scintillators to record over decay positrons. Two different in-vacuum muon-stopping targets were used in separate data-taking periods. The combined result gives . This measurement of the muon lifetime provides the most precise determination of the Fermi constant, , and will be used to extract the capture rates of the negative muon on the proton and the deuteron in the ongoing MuCap and MuSun experiments.