Symmetry Tests in Nuclear Beta Decay

Severijns, N.; Naviliat‐Cuncic, O.

doi:10.1146/annurev-nucl-102010-130410

Cited by 85 publications

(88 citation statements)

References 114 publications

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“…Thus the cancellation due to the contribution of b toB observed in pure Gamow-Teller processes does not necessarily happen in all mixed transitions. 4 In summary, the discussion above shows that the sensitivity of correlation coefficients which are linear in the exotic couplings can strongly be affected by the contribution of the Fierz term. For coefficients that depend quadratically on the couplings, the dominant sensitivity to these couplings will arise from the contribution of the Fierz term.…”

Section: Correlations In Allowed β Decaymentioning

confidence: 90%

“…Detailed accounts of new results and ongoing activities have been provided in several recent reviews [2,[4][5][6][7][8]. In this section we focus on current experiments or projects aiming at improving present limits on exotic couplings for both the real and imaginary parts.…”

Section: Experimental Activitiesmentioning

confidence: 99%

“…The tests of the SM and the searches for New Physics (NP) in nuclear and neutron decays have been the subject of several recent reviews, with focus either on experiments in nuclear β decay [2][3][4][5] or on experiments using cold or ultra-cold neutrons [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Correlations In Allowed β Decaymentioning

confidence: 90%

Section: Experimental Activitiesmentioning

confidence: 99%

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Prospects for precision measurements in nuclear decay in the LHC era

2013

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“…Alternatively, e.g., new, light degrees of freedom could appear and yield violations of the V − A law -if probed at sufficient experimental resolution. At the same time, an ongoing vigorous experimental program for precision measurements of neutron β decay observables with cold and ultracold neutrons [11][12][13][14][15][16][17] exists with an overarching goal of realizing bettered assessments of the limits of the SM. The experimental effort focuses on measurements of two general types of observables: angular correlation coefficients, which parametrize the angular correlations between the momenta of the various decay products and/or the spin of the initial state neutron or electron in the differential decay rate, and the neutron lifetime, τ .…”

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confidence: 99%

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Gardner

Plaster

2013

Phys. Rev. C

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We assess the ability of future neutron β decay measurements of up to O(10 −4 ) precision to falsify the standard model, particularly the V − A law, and to identify the dynamics beyond it. To do this, we employ a maximum likelihood statistical framework which incorporates both experimental and theoretical uncertainties. Using illustrative combined global fits to Monte Carlo pseudodata, we also quantify the importance of experimental measurements of the energy dependence of the angular correlation coefficients as input to such efforts, and we determine the precision to which ill-known "second-class" hadronic matrix elements must be determined in order to exact such tests.

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“…With realistic requirements on the precision of the measurement one can look for small admixtures of different types of interactions. This adds complementary information compared to experiments discussed in review [2].…”

Section: Introductionmentioning

confidence: 84%

Search for a Scalar Component in the Weak Interaction

Zákoucký

Baczyk

Ban

et al. 2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

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Weak interactions are described by the Standard Model which uses the basic assumption of a pure "V(ector)-A(xial vector)" character for the interaction. However, after more than half a century of model development and experimental testing of its fundamental ingredients, experimental limits for possible admixtures of scalar and/or tensor interactions are still as high as 7%.The WITCH project (Weak Interaction Trap for CHarged particles) at the isotope separator ISOLDE at CERN is trying to probe the structure of the weak interaction in specific low energy -decays in order to look for possible scalar or tensor components or at least significantly improve the current experimental limits. This worldwide unique experimental setup consisting of a combination of two Penning ion traps and a retardation spectrometer allows to catch, trap and cool the radioactive nuclei provided by the ISOLDE separator, form a cooled and scattering-free radioactive source of -decaying nuclei and let these nuclei decay at rest. The precise measurement of the shape of the energy spectrum of the recoiling nuclei, the shape of which is very sensitive to the character of the weak interaction, enables searching for a possible admixture of a scalar/tensor component in the dominant vector/axial vector mode.First online measurements with the isotope 35 Ar were performed in 2011 and 2012. The current status of the experiment, the data analysis and results as well as extensive simulations will be presented and discussed.

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Symmetry Tests in Nuclear Beta Decay

Cited by 85 publications

References 114 publications

Prospects for precision measurements in nuclear decay in the LHC era

Prospects for precision measurements in nuclear decay in the LHC era

Framework for maximum likelihood analysis of neutronβdecay observables to resolve the limits of theV−Alaw

Search for a Scalar Component in the Weak Interaction

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