NEW PRECISION-MEASUREMENT OF THE MUON MOMENTUM IN PION DECAY AT REST

被引：19

作者：

DAUM, M ^{[1
]}

FROSCH, R ^{[1
]}

HERTER, D ^{[1
]}

JANOUSCH, M ^{[1
]}

KETTLE, PR ^{[1
]}

机构：

[1] UNIV ZURICH,INST PHYS,CH-8001 ZURICH,SWITZERLAND

来源：

PHYSICS LETTERS B | 1991年 / 265卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(91)90078-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have continued the measurement of the muon momentum p-mu+ in the decay pi+ --> mu+nu-mu of pions at rest. The new result, p-mu+ = 29.79179 +/- 0.00053 MeV/c, and the assumption of a vanishing neutrino mass m-nu-mu lead to a charged pion mass of 139.56996 +/- 0.00067 MeV/c2, 3.5 standard deviations higher than the current world average of the mass obtained from pionic X-rays. For m-nu-mu > 0 the discrepancy would be even larger.

引用

页码：425 / 429

页数：5

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