Measurement of the radiative decay of polarized muons in the MEG experiment
We studied the radiative muon decay μ + → e + ν ν ¯ γ by using for the first time an almost fully polarized muon source. We identified a large sample ( ∼ 13,000) of these decays in a total sample of 1.8 × 10 14 positive muon decays collected in the MEG experiment in the years 2009–2010 and measured...
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Veröffentlicht in: | The European physical journal. C, Particles and fields Particles and fields, 2016-02, Vol.76 (3), p.1-8, Article 108 |
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Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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Zusammenfassung: | We studied the radiative muon decay
μ
+
→
e
+
ν
ν
¯
γ
by using for the first time an almost fully polarized muon source. We identified a large sample (
∼
13,000) of these decays in a total sample of
1.8
×
10
14
positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching ratio
B
(
μ
→
e
ν
ν
¯
γ
)
=
(
6.03
±
0.14
(
stat
.
)
±
0.53
(
sys
.
)
)
×
10
-
8
for
E
e
>
45
MeV
and
E
γ
>
40
MeV
, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for
μ
+
→
e
+
γ
process. |
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ISSN: | 1434-6044 1434-6052 |
DOI: | 10.1140/epjc/s10052-016-3947-6 |