Muon decay:: Measurement of the transverse e+ polarization and its implications on GF and time reversal invariance

被引：0

作者：

Fetscher, W. ^{[1
]}

Bodek, K. ^{[2
]}

Danneberg, N. ^{[1
]}

Jarczyk, L. ^{[2
]}

Kirch, K. ^{[1
]}

Kistryn, S. ^{[1
,2
]}

Koehler, K. ^{[1
]}

Lang, J. ^{[1
]}

Kozela, A. ^{[1
,3
]}

Schweizer, T.

Smyrski, J.

Stephan, E.

Strzalkowski, A. ^{[4
]}

von Allmen, A.

Zejma, J.

机构：

[1] ETH, Inst Teilchenphys, CH-8093 Zurich, Switzerland

[2] Paul Sherrer Inst, Inst Phys, CH-5232 Villigen, Switzerland

[3] Inst Nucl Phys, Krakow, Poland

[4] Univ Silesia, Inst Phys, Katowice, Poland

来源：

PARTICLES AND NUCLEI | 2006年 / 842卷

基金：

瑞士国家科学基金会;

关键词：

muon decay; Michel parameters; transverse polarization; Fermi coupling constant; violation of time reversal invariance; scalar coupling constant;

D O I：

暂无

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The transverse polarization components of the positrons from the decay of polarized muons have been measured at the Paul Scherrer Institute by annihilating in flight the decay positrons with polarized electrons. The use of a stroboscopic method greatly reduces systematic errors. The energy dependence of the transverse polarization component P-TI, which lies in the plane defined by muon spin and positron momentum, yields the low energy parameter eta = (-2 +/- 8) x 10(-3) and thus an improved model-independent value of the Fermi coupling constant. For the transverse polarization P-T2, averaged over the positron energy, we obtain (P-T2) = (-4 +/- 8) x 10(-3). This improves the previous limit on the violation of time invariance in muon decay [1] by a factor of three.

引用

页码：897 / 899

页数：3

共 26 条

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Fetscher, W.
Bodek, K.
Danneberg, N.
Jarczyk, L.
Kirch, K.
Kistryn, S.
Koehler, K.
Lang, J.
Kozela, A.
Schweizer, T.
Smyrski, J.
Stephan, E.
Strzalkowski, A.
von Allmen, A.
Zejma, J.
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Fetscher, W
Bodek, K
Danneberg, N
Jarczyk, L
Kistryn, S
Köhler, K
Kirch, K
Kozela, A
Lang, J
Smyrski, J
Schweizer, T
Stephan, E
Strzalkowski, A
Zejma, J
von Allmen, A
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