Measurement of the proton asymmetry parameter in neutron beta decay.
The proton asymmetry parameter C in neutron decay describes the angular correlation between neutron spin and proton momentum. In this Letter, the first measurement of this quantity is presented. The result C= -0.2377(26) agrees with the standard model expectation. The coefficient C provides an additional parameter for new and improved standard model tests.
Schumann
M
M
Physikalisches Institut der Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany. marc.schumann@gmx.net
Kreuz
M
M
Deissenroth
M
M
Glück
F
F
Krempel
J
J
Märkisch
B
B
Mund
D
D
Petoukhov
A
A
Soldner
T
T
Abele
H
H