Measurement of the Electron-Antineutrino Angular Correlation in Neutron 
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 Decay

Darius, G.; Byron, W. A.; DeAngelis, C.; Hassan, Md. T.; Wietfeldt, F. E.; Collett, B.; Jones, G. L.; Dewey, M. S.; Mendenhall, M. P.; Nico, J. S.; Park, H; Komives, A.; Stephenson, E. J.

doi:10.1103/physrevlett.119.042502

Cited by 43 publications

(23 citation statements)

References 19 publications

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“…At present, one obtains a more precise value of V ud from superallowed decays via Eq. (1) than from neutron decay, despite the presence of the additional nuclear structure-dependent corrections that one must apply to obtain Ft. With the advent of future, more precise measurements of τ n and neutron decay correlations that yield λ, the precision of the V ud determinations from nuclear and neutron decays may become comparable [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Dispersive evaluation of the inner radiative correction in neutron and nuclear β decay

2019

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both a high degree of experimental precision and robust theoretical computations used to extract CKM matrix elements from experimental observables.Here, we focus on the hadronic and nuclear theory relevant to tests of the first row CKM unitarity condition : |V ud | 2 + |V us | 2 + |V ub | 2 = 1. The matrix element |V ud | = 0.97420 ± 0.00021 [2] is the main contributor to the first row unitarity, and is relevant for charged pion, neutron, and nuclear β-decay. Currently, the most precise determination of the value of V ud is obtained with the superallowed 0 + -0 + nuclear β decays. Since both initial and final nuclei have no spin, only the vector current interaction with the nucleus contributes at leading order. The conservation of the vector current (CVC) protects the vector coupling from being renormalized by the strong interaction and makes 0 + -0 + nuclear β decays an especially robust method for determining V ud . Precision tests require, apart from the purely experimental accuracy, an accurate computation of SM electroweak radiative corrections (RC). The present day framework for computing these corrections was formulated in the classic arXiv:1812.03352v3 [nucl-th]

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Section: Introductionmentioning

confidence: 99%

Dispersive evaluation of the inner radiative correction in neutron and nuclear β decay

2019

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“…Our result from the NG-6 run is a = −0.1090 ± 0.0030(stat) ± 0.0028(sys). Additional details on the design, construction, alignment, and calibration of the aCORN apparatus and individual components, and analysis of systematic effects, can be found in previous publications [15,19,18,20].…”

Section: Experiments and Resultsmentioning

confidence: 99%

aCORN: Measuring the electron-antineutrino correlation in neutron beta decay

et al. 2019

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The aCORN experiment uses a novel asymmetry method to measure the electron-antineutrino correlation (a-coefficient) in free neutron decay that does not require precision proton spectroscopy. aCORN completed two physics runs at the NIST Center for Neutron Research. The first run on the NG-6 beam line in 2013-2014 obtained the result a = 0.1090 +/-0.0030 (stat) +/-0.0028 (sys), a total uncertainty of 3.8%. The second run on the new NG-C high flux beam line promises an improvement in precision to < 2%.PRESENTED AT CIPANP2018 1 current address:

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“…Up until now, λ is determined most precisely from measurements of the electron asymmetry parameter A [5-10] (current Particle Data Group accuracy ∆A/A = 0.84 % [11], which doesn't include the most recent results). Measurements of the electron-antineutrino angular correlation coefficient a have not reached sub-percent accuracy yet [12][13][14] (currently ∆a/a = 2.6 % [11]). However, they offer an independent approach with significant potential for improvement.…”

Section: Introductionmentioning

confidence: 99%

“…However, they offer an independent approach with significant potential for improvement. Therefore, a number of experiments is currently putting effort into improving on it [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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NoMoS: AnR × Bdrift momentum spectrometer for beta decay studies

et al. 2019

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The beta decay of the free neutron provides several probes to test the Standard Model of particle physics as well as to search for extensions thereof. Hence, multiple experiments investigating the decay have already been performed, are under way or are being prepared. These measure the mean lifetime, angular correlation coefficients or various spectra of the charged decay products (proton and electron). NoMoS, the neutron decay products momentum spectrometer, presents a novel method of momentum spectroscopy: it utilizes the R × B drift effect to disperse charged particles dependent on their momentum in an uniformly curved magnetic field. This spectrometer is designed to precisely measure momentum spectra and angular correlation coefficients in free neutron beta decay to test the Standard Model and to search for new physics beyond. With NoMoS, we aim to measure inter alia the electron-antineutrino correlation coefficient a and the Fierz interference term b with an ultimate precision of ∆a/a < 0.3% and ∆b < 10 −3 respectively. In this paper, we present the measurement principles, discuss measurement uncertainties and systematics, and give a status update. * Neutron Beta Decay in the Standard ModelThe beta decay of the free neutron is well described within the V-A theory of the SM. Fermi's Golden Rule for the neutron's decay rate yields the following insightful correlation between the mean lifetime τ n , the weak axial-vector coupling constant g A and V ud [3]: arXiv:1906.04511v1 [physics.ins-det]

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Measurement of the Electron-Antineutrino Angular Correlation in Neutron β Decay

Cited by 43 publications

References 19 publications

Dispersive evaluation of the inner radiative correction in neutron and nuclear β decay

Dispersive evaluation of the inner radiative correction in neutron and nuclear β decay

aCORN: Measuring the electron-antineutrino correlation in neutron beta decay

NoMoS: AnR × Bdrift momentum spectrometer for beta decay studies

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