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Determination of the Weak Axial Vector Coupling from a Measurement of the Beta-Asymmetry Parameter A in Neutron Beta Decay

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arxiv 1204.0013 v1 pith:2OAZ3HEA submitted 2012-03-30 hep-ex nucl-ex

D. Mund , B. Maerkisch , M. Deissenroth , J. Krempel , M. Schumann , H. Abele , A. Petoukhov , T. Soldner This is my paper · ORCID
classification hep-exnucl-ex
keywords neutronbeta-asymmetrycouplingmathrmmeasurementparameterreducedvector
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abstract

We report on a new measurement of the neutron beta-asymmetry parameter $A$ with the instrument \perkeo. Main advancements are the high neutron polarization of $P = 99.7(1)%$ from a novel arrangement of super mirror polarizers and reduced background from improvements in beam line and shielding. Leading corrections were thus reduced by a factor of 4, pushing them below the level of statistical error and resulting in a significant reduction of systematic uncertainty compared to our previous experiments. From the result $A_0 = -0.11996(58)$, we derive the ratio of the axial-vector to the vector coupling constant $\lambda = g_\mathrm{A}/g_\mathrm{V} = -1.2767(16)$

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Cited by 2 Pith papers

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  1. Vector-like quark doublets, weak-basis invariants and CP violation

    hep-ph 2024-12 conditional novelty 7.0 of 10

    Vector-like quark doublets allow CP violation in weak-basis invariants of mass dimension six; the resulting framework organizes the model's parameters, gives the complete CP-odd invariant set for one doublet, and link...

  2. Isovector axial and pseudoscalar form factors from twisted mass lattice QCD at the physical point

    hep-lat 2025-02 conditional novelty 3.0 of 10

    From three physical-point twisted mass ensembles, the authors extract g_A, the axial radius, g_P^* and g_piNN in the continuum limit and report that PCAC and pion pole dominance hold.

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