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arXiv · 1812.04666

Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam

Bastian Märkisch·Holger Mest·Heiko Saul·Xiangzun Wang·Hartmut Abele·Dirk Dubbers·Michael Klopf·Alexander Petoukhov·Christoph Roick·Torsten Soldner·Dominik Werder
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Abstract

We present a precision measurement of the axial-vector coupling constant $g_A$ in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this purpose. By this method, leading sources of systematic uncertainty are suppressed. From the electron spectra we obtain $\lambda = g_A/g_V = -1.27641(45)_\mathrm{stat}(33)_\mathrm{sys}$ which confirms recent measurements with improved precision. This corresponds to a value of the parity violating beta asymmetry parameter of $A_0 = -0.11985(17)_\mathrm{stat}(12)_\mathrm{sys}$. We discuss implications on the CKM matrix element $V_{ud}$ and derive a limit on left-handed tensor interaction.

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Bastian Märkisch, Holger Mest, Heiko Saul, Xiangzun Wang, Hartmut Abele, Dirk Dubbers, Michael Klopf, Alexander Petoukhov, Christoph Roick, Torsten Soldner, Dominik Werder. 2018-12-11. Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam. https://doi.org/10.1103/physrevlett.122.242501

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