A meta-analysis of neutron lifetime measurements

Abstract

We calculated the median as well as weighted mean central estimates for the neutron lifetime, from a subset of measurements compiled in the 2019 update of the Particle Data Group (PDG). We then reconstruct the error distributions for the residuals using three different central estimates and then check for consistency with a Gaussian distribution. We find that although the error distributions using the weighted mean as well as median estimate are consistent with a Gaussian distribution, the Student's $t$ and Cauchy distribution provide a better fit. This median statistic estimate of the neutron lifetime from these measurements is given by $881.5\pm 0.47$ seconds. This can be used as an alternate estimate of the neutron lifetime. We also note that the discrepancy between beam and bottle-based measurements using median statistics of the neutron lifetime persists with a significance between 4-8$\sigma$, depending on which combination of measurements is used.

arXiv comment6 pages

References in corpus (24)

• Measurement of the neutron lifetime using a gravitational trap and a low-temperature Fomblin coating
• Improved Determination of the Neutron Lifetime
• Dark Matter Interpretation of the Neutron Decay Anomaly
• Median Statistics, H_0, and the Accelerating Universe
• Measurement of the neutron lifetime using an asymmetric magneto- gravitational trap and in situ detection
• Neutron Lifetime and Axial Coupling Connection
• Median statistics and the Hubble constant
• Neutron lifetime measurements with the big gravitational trap for ultracold neutrons
• Non-Gaussian Error Distribution of Hubble Constant Measurements
• Dark Side of the Neutron?
• Median Statistics and the Mass Density of the Universe
• Not Normal: the uncertainties of scientific measurements
• Median Statistics Estimate of the Distance to the Galactic Center
• Median statistics estimates of Hubble and Newton's Constant
• Statistical Significance of spectral lag transition in GRB 160625B
• Statistical Models with Uncertain Error Parameters
• Neutron lifetime measurements and effective spectral cleaning with an ultracold neutron trap using a vertical Halbach octupole permanent magnet array
• Non-Gaussian Error Distributions of LMC Distance Moduli Measurements
• Median statistics cosmological parameter values
• Non-Gaussian Error Distribution of ${}^7\mathrm{Li}$ Abundance Measurements
• Median Statistics Analysis of Deuterium Abundance Measurements and Spatial Curvature Constraints
• Median Statistics Estimate of the Galactic Rotational Velocity
• Cosmological constraints on the neutron lifetime
• Non-Gaussian Error Distributions of Galactic Rotation Speed Measurements

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