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

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.

References in corpus (3)

• Measurement of the Neutrino Asymmetry Parameter B in Neutron Decay
• Exotic decay channels are not the cause of the neutron lifetime anomaly
• Measurement of the Proton Asymmetry Parameter C in Neutron Beta Decay

Cited by in corpus (100)

• Coherent elastic neutrino-nucleus scattering: EFT analysis and nuclear responses
• Joint lattice QCD - dispersion theory analysis confirms the quark-mixing top-row unitarity deficit
• Beta decays as sensitive probes of lepton flavor universality
• Comprehensive analysis of beta decays within and beyond the Standard Model
• Standard Model $\mathcal{O}(\alpha )$ renormalization of $g_A$ and its impact on new physics searches
• Precision Nucleon Charges and Form Factors Using 2+1-flavor Lattice QCD
• Precision Studies of QCD in the Low Energy Domain of the EIC
• Scrutinizing CKM unitarity with a new measurement of the $K_{\mu 3}/K_{\mu 2}$ branching fraction
• First-principles calculation of electroweak box diagrams from lattice QCD
• The Fermi constant from muon decay versus electroweak fits and CKM unitarity
• Quark masses using twisted mass fermion gauge ensembles
• First-Generation New Physics in Simplified Models: From Low-Energy Parity Violation to the LHC
• Unveiling Hidden Physics at the LHC
• Exotic decay channels are not the cause of the neutron lifetime anomaly
• Pion-induced radiative corrections to neutron beta-decay
• Reactor neutrino oscillations as constraints on Effective Field Theory
• Effective field theory for radiative corrections to charged-current processes I: Vector coupling
• Dispersion relation analysis of the radiative corrections to $g_A$ in the neutron $\beta$-decay
• Global Fit of Modified Quark Couplings to EW Gauge Bosons and Vector-Like Quarks in Light of the Cabibbo Angle Anomaly
• Angular Momentum Transport in Proto-Neutron Stars and the Fate of Neutron Star Merger Remnants
• Neutron Stars with Baryon Number Violation, Probing Dark Sectors
• Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations
• Particle Physics at the European Spallation Source
• Testing Lepton Flavor Universality with Pion, Kaon, Tau, and Beta Decays
• Neutron lifetime measurement with pulsed cold neutrons
• An accurate evaluation of electron (anti-)neutrino scattering on nucleons
• EFT analysis of New Physics at COHERENT
• Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment
• Precise Measurements of the Decay of Free Neutrons
• Search for explanation of the neutron lifetime anomaly
• 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
• Ab initio calculation of the $\beta$ decay spectrum of ${}^6$He
• Radiative corrections to semileptonic beta decays: Progress and challenges
• Superallowed nuclear beta decays and precision tests of the Standard Model
• Toward $N$ to $N\pi$ matrix elements from lattice QCD
• Testing the Inverted Neutrino Mass Ordering with Neutrinoless Double-Beta Decay
• The Standard Model theory of neutron beta decay
• Model-independent determination of nuclear weak form factors and implications for Standard Model precision tests
• Neutron Dark Decay
• Data-driven reevaluation of $ft$-values in superallowed $\beta$ decays
• 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
• How Macroscopic Limits on Neutron Star Baryon Loss Yield Microscopic Limits on Non-Standard-Model Baryon Decay
• Distinguishing Dirac vs. Majorana Neutrinos: a Cosmological Probe
• Probing conventional and new physics at the ESS with coherent elastic neutrino-nucleus scattering
• Probing Dark Sectors with Neutron Stars
• Array of Cryogenic Calorimeters to Evaluate the Spectral Shape of forbidden $\beta$-decays: the ACCESS project
• Detailed analysis of excited state systematics in a lattice QCD calculation of $g_A$
• Description of ${}^{93}$Nb stellar electron-capture rates by the Projected Shell Model
• Competition between allowed and first-forbidden $\beta$ decay in $r$-process waiting-point nuclei within a relativistic beyond-mean-field approach
• Theoretical analysis and predictions for the double electron capture of ${}^{124}$Xe
• Investigation of pion-nucleon contributions to nucleon matrix elements
• Influence of the recoil-order and radiative correction on the beta decay correlation coefficients in mirror decays
• Estimation of nuclear matrix elements of double-$\beta$ decay from shell model and quasiparticle random-phase approximation
• Pion-nucleon scattering to order $p^4$ in SU(3) heavy baryon chiral perturbation theory
• Towards a discovery of BSM physics from the Cabibbo angle anomaly
• Phase shifts of the light pseudoscalar meson and heavy meson scattering in heavy meson chiral perturbation theory
• Simultaneous Measurement of Half-Life and Spectral Shape of ${}^{115}$In $\beta$-decay with an Indium Iodide Cryogenic Calorimeter
• Helium film may greatly increase the storage time of ultracold neutrons in material traps
• Interplay between non-interfering neutrino exchange mechanisms and nuclear matrix elements in $0\nu \beta \beta$ decay
• Realization of an advanced super-mirror solid-state neutron polarizer for the instrument PF1B at the Institut Laue-Langevin
• $\tau$SPECT: A spin-flip loaded magnetic ultracold neutron trap for a determination of the neutron lifetime
• Double-beta decay of ${}^{150}$Nd to excited levels of ${}^{150}$Sm
• On the possibility of a significant increase in the storage time of ultracold neutrons in traps coated with a liquid helium film
• Theoretical point of view on Cabibbo angle anomaly
• On the structure of the correlation coefficients S(E_e) and U(E_e) of the neutron beta decay
• 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}
• On the correlation coefficient T(E_e) of the neutron beta decay, caused by the correlation structure invariant under discrete P, C and T symmetries
• MeV Sterile Neutrino in light of the Cabibbo-Angle Anomaly
• Theoretical evaluation of solar proton-proton fusion reaction rate and its uncertainties
• Neutrino nucleus Quasi-Elastic and resonant Neutral Current scatterings with Non-Standard Interactions
• Radiative corrections of order $O(\alpha E_e/m_N)$ to Sirlin's radiative corrections of order $O(\alpha /\pi )$, induced by the hadronic structure of the neutron
• Towards a first measurement of the free neutron bound beta decay detecting hydrogen atoms at a throughgoing beamtube in a high flux reactor
• Vector-like quark doublets, weak-basis invariants and CP violation
• Pion-nucleon scattering with decuplet contribution in heavy baryon SU(3) chiral perturbation theory
• Improving of ultracold neutron traps coated with liquid helium using capillarity and electric field
• Neutron-neutral particle mixing and its observable consequences
• Peripheral nucleon-nucleon scattering at next-to-next-to-leading order in SU(3) heavy baryon chiral perturbation theory
• Corrections of order O(E^2_e/m^2_N), caused by weak magnetism and proton recoil, to the neutron lifetime and correlation coefficients of the neutron beta decay
• Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC
• A study of the relativistic corrections to polarized tritium $\beta$-decay
• Octet baryon and heavy meson interactions in chiral effective field theory
• 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
• Particles in finite volumes and a toy model of decaying neutrons
• Reducing Hadronic Uncertainty in Low-Energy Neutral-Current Processes
• 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
• Constraints for rare electron-capture decays mimicking detection of dark-matter particles in nuclear transitions
• Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US
• Study of silicon photomultipliers for use in neutron decay experiments
• Measurement of Neutron Lifetime and Purcell Effect
• Numerical Calculation of Electric Field Enhancement in Neutron Traps with Rough Walls Coated with Superfluid Helium
• Majorana neutrino mass constraints in the landscape of nuclear matrix elements