Improved determination of the $\beta$-${\overline{\nu }}_e$ angular correlation coefficient $a$ in free neutron decay with the $a$SPECT spectrometer

Abstract

We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a=-0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|\lambda |=1.2677(28)$.

References in corpus (39)

• Sub-millimeter Tests of the Gravitational Inverse-square Law
• Cosmic-ray ionization of molecular clouds
• Tests of the standard electroweak model in beta decay
• Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC
• Reduced hadronic uncertainty in the determination of $V_{ud}$
• Improved Calculation of Electroweak Radiative Corrections and the Value of V_ud
• Superallowed 0+ --> 0+ nuclear beta decays: 2014 critical survey, with precise results for Vud and CKM unitarity
• The neutron and its role in cosmology and particle physics
• A percent-level determination of the nucleon axial coupling from Quantum Chromodynamics
• New physics searches in nuclear and neutron $\beta$ decay
• Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam
• Radiative Corrections to Neutron and Nuclear Beta Decays Revisited
• Beta Decays and Non-Standard Interactions in the LHC Era
• New limit on Lorentz and CPT violating neutron spin interactions using a free precession 3He-129Xe co-magnetometer
• Dispersive Evaluation of the Inner Radiative Correction in Neutron and Nuclear $\beta$-decay
• Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $\beta$-decay?
• Determination of the Weak Axial Vector Coupling from a Measurement of the Beta-Asymmetry Parameter A in Neutron Beta Decay
• Neutron Lifetime and Axial Coupling Connection
• Isovector Charges of the Nucleon from 2+1+1-flavor Lattice QCD
• Characterization of a ballistic supermirror neutron guide
• Constraints on Spin-Dependent Short-Range Interaction between Nucleons
• Nucleon axial form factors using lattice QCD simulations with a physical value of the pion mass
• Quark spins and Anomalous Ward Identity
• Precision Measurement of the Neutron Beta-Decay Asymmetry
• New result for the neutron $\beta$-asymmetry parameter $A_0$ from UCNA
• Global Effective-Field-Theory analysis of New-Physics effects in (semi)leptonic kaon decays
• Iso-vector axial form factors of the nucleon in two-flavour lattice QCD
• Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons
• Symmetry violations in nuclear and neutron $\beta$ decay
• Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay
• Variation in electron work function with temperature and its effect on the Young's modulus of metals
• Kassiopeia: A Modern, Extensible C++ Particle Tracking Package
• Supersymmetric Contributions to Weak Decay Correlation Coefficients
• Limits on Tensor Coupling from Neutron $\beta$-Decay
• Measuring the proton spectrum in neutron decay - latest results with aSPECT
• Effect of a sweeping conductive wire on electrons stored in the Penning trap between the KATRIN spectrometers
• Nucleon average quark momentum fraction with $N_{\mathrm{f}}=2+1$ Wilson fermions
• Radial distribution of charged particles in a magnetic field
• The magnetic shielding for the neutron decay spectrometer aSPECT

Cited by in corpus (32)

• Standard Model $\mathcal{O}(\alpha )$ renormalization of $g_A$ and its impact on new physics searches
• Comprehensive analysis of beta decays within and beyond the Standard Model
• Particle Physics at the European Spallation Source
• Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment
• Precise Measurements of the Decay of Free Neutrons
• Ab-initio electroweak corrections to superallowed $\beta$ decays and their impact on $V_{ud}$
• Dispersive formalism for the nuclear structure correction ${\delta }_{\mathrm{NS}}$ to the $\beta$ decay rate
• $\mathcal{F}t$ values of the mirror $\beta$ transitions and the weak magnetism induced current in allowed nuclear $\beta$ decay
• Radiative corrections to superallowed $\beta$ decays in effective field theory
• The Standard Model theory of neutron beta decay
• Neutron Dark Decay
• Sterile neutrinos with non-standard interactions in $\beta$- and $0\nu \beta \beta$-decay experiments
• Constraints on subleading interactions in beta decay Lagrangian
• Neutron lifetime anomaly and mirror matter theory
• Towards $ab$-$initio$ nuclear theory calculations of ${\delta }_{\mathrm{C}}$
• Opportunities and open questions in modern $\beta$ decay
• Probing Dark Sectors with Neutron Stars
• How Macroscopic Limits on Neutron Star Baryon Loss Yield Microscopic Limits on Non-Standard-Model Baryon Decay
• Detailed analysis of excited state systematics in a lattice QCD calculation of $g_A$
• Towards a discovery of BSM physics from the Cabibbo angle anomaly
• $\tau$SPECT: A spin-flip loaded magnetic ultracold neutron trap for a determination of the neutron lifetime
• Neutron Polarimetry Using a Polarized 3He Cell for the aCORN Experiment
• Precision pulse shape simulation for proton detection at the Nab experiment
• Theoretical description of the neutron beta decay in the standard model at the level of 10^{-5}
• Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC
• Most general neutron decay correlations: Standard Model recoil and radiative corrections
• The Role of Ab Initio Beta-Decay Calculations in Light Nuclei for Probes of Physics Beyond the Standard Model
• A novel technique of extracting UCN lifetimes from storage bottle measurements dominated by scattering losses
• Testing effective field theory with the most general neutron decay correlations
• Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US
• Geometric Optimization of a Neutron Detector for In-Flight Measurement of the Neutron Lifetime
• The Strange Physics of Dark Baryons