Precision Measurement of the 
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 Asymmetry in Spin-Polarized 
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 Decay

Fenker, B.; Gorelov, A.; Melconian, D.; Behr, J. A.; Anholm, M.; Ashery, D.; Behling, R. S.; Cohen, I.; Craiciu, Ioana; Gwinner, G.; McNeil, J.; Mehlman, M.; Olchanski, K.; Shidling, P. D.; Smale, S.; Warner, Claire

doi:10.1103/physrevlett.120.062502

Cited by 46 publications

(39 citation statements)

References 53 publications

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“…Statistics and systematics contribute similarly to the uncertainty, with a small contribution from the uncertainty in determining the nuclear polarization. The systematics is dominated by the uncertainty on the background correction, the position and velocity of the trapped atom cloud and the choice of the Geant4 physics list package for the simulations [183]. The above result has a slightly higher sensitivity to right-handed currents compared to previous measurements of the β-particle longitudinal polarization in the decays of 12 N and 107 In [372][373][374][375].…”

Section: β-Asymmetry Parametermentioning

confidence: 77%

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New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

235

282

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The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear β decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available β-decay data is performed incorporating, for the first time in a consistent way, superallowed 0 + → 0 + transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left-or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to V ud and g A respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is C A /C V = −1.27510(66). The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low-and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

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Section: β-Asymmetry Parametermentioning

confidence: 77%

“…Recently, first results for the asymmetry parameter using laser optical pumping in a MOT, obtained with TRINAT, have been reported [78,183]. Atoms of the mirror nucleus 37 K were confined in an alternating-current MOT and were spinpolarized to 99.13(9)% via optical pumping [369].…”

Section: β-Asymmetry Parametermentioning

confidence: 99%

New physics searches in nuclear and neutron β decay

González–Alonso

Naviliat‐Cuncic

Severijns

2019

Progress in Particle and Nuclear Physics

235

282

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“…For 37 K, we do not include recoil effects because they were already subtracted from the value of A in ref. [39]. Finally for 17 F and 29 P we neglect all subleading contributions because the experimental uncertainty is much larger for these transitions.…”

Section: Jhep04(2021)126mentioning

confidence: 99%

Comprehensive analysis of beta decays within and beyond the Standard Model

Falkowski

González–Alonso

Naviliat‐Cuncic

2021

J. High Energ. Phys.

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Precision measurements in allowed nuclear beta decays and neutron decay are reviewed and analyzed both within the Standard Model and looking for new physics. The analysis incorporates the most recent experimental and theoretical developments. The results are interpreted in terms of Wilson coefficients describing the effective interactions between leptons and nucleons (or quarks) that are responsible for beta decay. New global fits are performed incorporating a comprehensive list of precision measurements in neutron decay, superallowed 0+→ 0+ transitions, and other nuclear decays that include, for the first time, data from mirror beta transitions. The results confirm the V-A character of the interaction and translate into updated values for Vud and gA at the 10−4 level. We also place new stringent limits on exotic couplings involving left-handed and right-handed neutrinos, which benefit significantly from the inclusion of mirror decays in the analysis.

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“…Observing table II, accumulation of 10 6 recoil ion events in the decay of 19 Ne already improves on the state of the art, and reduces the uncertainty in the prediction of A, which is well-motivated considering the discrepancies in other determinations of A, as well as deviations from the conserved-vector-current hypothesis as discussed in [97]. To complement the highly precise determination of V ud from the body of 0 + → 0 + decay data [53], and considering ongoing correlation measurement efforts with nuclear mirror [35,38,[100][101][102][103][104][105], and neutron [63,64,[106][107][108][109] decays, roughly 10 7 detected events are desired, especially in light of the emergence of a significant (4σ) deviation from CKM unitarity obtained in a recent analysis [110].…”

Section: Opportunities With Neon Isotopesmentioning

confidence: 98%

Decay microscope for trapped neon isotopes

et al. 2020

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We review the design, simulation, and tests, of a detection system for measuring the energy distribution of daughter nuclei recoiling from the beta-decay of laser trapped neon isotopes. This distribution is sensitive to several new physics effects in the weak sector. Our 'decay microscope' relies on imaging the velocity distribution of high energy recoil ions in coincidence with electrons shaken-off in the decay. We demonstrate by way of Monte-Carlo simulation, that the nuclear microscope increases the statistical sensitivity of kinematic measurements to the underlying energy distribution, and limits the main systematic bias caused by discrepancy in the trap position along the detection axis.

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Precision Measurement of the β Asymmetry in Spin-Polarized K37 Decay

Cited by 46 publications

References 53 publications

New physics searches in nuclear and neutron β decay

New physics searches in nuclear and neutron β decay

Comprehensive analysis of beta decays within and beyond the Standard Model

Decay microscope for trapped neon isotopes

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