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Recoil-Order and Radiative Corrections to the aCORN Experiment
Authors
W. A. Byron
B. Collett
+8Â more
M. S. Dewey
T. R. Gentile
M. T. Hassan
G. L. Jones
A. Komives
J. S. Nico
E. J. Stephenson
F. E. Wietfeldt
Publication date
26 June 2023
Publisher
View
on
arXiv
Abstract
The aCORN experiment measures the electron-antineutrino
a
a
a
-coefficient in free neutron decay. We update the previous aCORN results to include radiative and recoil corrections to first order. The corrected combined result is
⟨
a
⟩
=
−
0.10859
±
.
00125
 
(
s
t
a
t
)
±
0.00133
 
(
s
y
s
)
\langle a \rangle = -0.10859 \pm .00125\, ({\rm stat}) \pm 0.00133\, ({\rm sys})
⟨
a
⟩
=
−
0.10859
±
.00125
(
stat
)
±
0.00133
(
sys
)
, an increase in magnitude of 0.7 % compared to the overall relative standard uncertainty of 1.7 %, which is unchanged. The corresponding corrected result for the ratio of weak coupling constants
λ
=
G
A
/
G
V
\lambda = G_A/G_V
λ
=
G
A
​
/
G
V
​
is
λ
=
−
1.2737
±
0.0061
\lambda = -1.2737 \pm 0.0061
λ
=
−
1.2737
±
0.0061
. This improves agreement with previous
a
a
a
-coefficient experiments, in particular the 2020 aSPECT result
Similar works
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oai:arXiv.org:2306.15042
Last time updated on 02/07/2023