Weak interaction studies with [sup 6]He

Knecht, A.; Alexander, Z. T.; Bagdasarova, Yelena; Cope, T. M.; Delbridge, B. G.; Fléchard, X.; Garcı́a, A.; Hong, R.; Liénard, E.; Müller, P.; Naviliat‐Cuncic, O.; Palmer, A.S.C.; Robertson, R. G. H.; Storm, D. W.; Swanson, H. E.; Utsuno, S.; Waûters, Frederik; Williams, W. D.; Wrede, C.; Zumwalt, David

doi:10.1063/1.4826859

Cited by 14 publications

(12 citation statements)

References 23 publications

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“…28 (right panel), the change in low-energy constraints is due to improvements in experiments: We assume future measurements of the Fierz interference term and the neutrino asymmetry parameter (b and b ν ) in neutron decay will be at the level of 10 −3 [8][9][10]76]. A similar constraining power on T can be achieved with a 0.1%-level measurement of the Fierz term in the pure Gamow-Teller 6 He decay [77].…”

Section: Constraining New Physics Using Precision Beta Decay Measmentioning

confidence: 99%

Axial, scalar, and tensor charges of the nucleon from2+1+1-flavor Lattice QCD

et al. 2016

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We present results for the isovector axial, scalar and tensor charges g The lattice-QCD calculations were done using nine ensembles of gauge configurations generated by the MILC Collaboration using the HISQ action with 2+1+1 dynamical flavors. These ensembles span three lattice spacings a ≈ 0.06, 0.09 and 0.12 fm and light-quark masses corresponding to the pion masses Mπ ≈ 135, 225 and 315 MeV. High-statistics estimates on five ensembles using the all-mode-averaging method allow us to quantify all systematic uncertainties and perform a simultaneous extrapolation in the lattice spacing, lattice volume and light-quark masses for the connected contributions. Our final estimates, in the MS scheme at 2 GeV, of the isovector charges are g (51)(20). The first error includes statistical and all systematic uncertainties except that due to the extrapolation Ansatz, which is given by the second error estimate. Combining our estimate for g 194(14). Combining our new estimates with precision low-energy experiments, we present updated constraints on novel scalar and tensor interactions, S,T , at the TeV scale.

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Section: Constraining New Physics Using Precision Beta Decay Measmentioning

confidence: 99%

Axial, scalar, and tensor charges of the nucleon from2+1+1-flavor Lattice QCD

et al. 2016

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“…For pure Gamow-Teller transitions, considering the number of ongoing experiments in 6 He, 8 Li and neutron decays and the anticipated precision goals on a longer time scale [79,88], it is expected that the next round of measurements of a could reach a precision at the 0.1% level. This should have a significant impact to further constraint possible tensor contributions.…”

Section: The βν Angular Correlation Amentioning

confidence: 99%

“…The physics plans include a measurement of a and of the Fierz interference term [77]. The measurement of a will be performed with atoms confined in a MOT [79] and by detecting the β particles in coincidence with the recoil ions. The goal of this project is to reach the precision level of 1% in a first phase and reach an ultimate precision of 0.1% after possible improvements of the setup [79].…”

Section: The βν Angular Correlation Amentioning

confidence: 99%

Prospects for precision measurements in nuclear decay in the LHC era

2013

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Precision measurements in nuclear β decay offer a sensitive window to search for new physics beyond the standard electroweak model. Searches for new physics are also a strong motivation for experiments carried out at the high energy frontier. It is instructive to confront results from the low energy and the high energy frontiers in order to look for possible complementarities. This paper reviews the constraints on new physics obtained from nuclear and neutron decays and compares them to those from other semi-leptonic processes and from the LHC. The sensitivity requirements of new precision experiments in β decay, to impact the search for new physics at the light of current and projected LHC results, are updated. Experimental developments in nuclear and neutron β decay are discussed with emphasis on their projected goals to improve the limits on exotic weak couplings.

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“…The associated constraints are therefore not competitive with determinations of b from other observables that dominate the fits. However it is important to notice that this might change in the near future with new generation measurements of the recoil spectrum [42].…”

Section: Discussionmentioning

confidence: 99%

Kinematic sensitivity to the Fierz term ofβ-decay differential spectra

González–Alonso

Naviliat‐Cuncic

2016

Phys. Rev. C

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The current most stringent constraints on exotic scalar or tensor couplings in neutron and nuclear β decay, involving left-handed neutrinos, are obtained from the Fierz interference term. The sensitivity to this term in a correlation coefficient is usually driven by an energy-averaged kinematic factor that increases monotonically toward smaller values of the β endpoint energies. We first point out here that this property does not hold for certain differential observables that are directly sensitive to the Fierz term, such as the β or the recoil energy spectrum. This observation is relevant for the selection of sensitive transitions in searches for exotic couplings through spectrum shape measurements. We then point out previous errors in the exploitation of measurements of the β − ν angular correlation coefficient and discuss their impact on the extraction of constraints on exotic couplings.

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Weak interaction studies with [sup 6]He

Cited by 14 publications

References 23 publications

Axial, scalar, and tensor charges of the nucleon from2+1+1-flavor Lattice QCD

Axial, scalar, and tensor charges of the nucleon from2+1+1-flavor Lattice QCD

Prospects for precision measurements in nuclear decay in the LHC era

Kinematic sensitivity to the Fierz term ofβ-decay differential spectra

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