Tests of the standard electroweak model in nuclear beta decay

Severijns, N.; Beck, M.; Naviliat‐Cuncic, O.

doi:10.1103/revmodphys.78.991

Cited by 343 publications

(539 citation statements)

References 284 publications

(279 reference statements)

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“…Under such conditions, the factor m/E e becomes an important quantity since it can suppress or enhance significantly the NP sensitivity. This factor depends on the transition and the details of the experiment, and is typically in the range 0.2 − 0.7 [2].…”

Section: Correlations In Allowed β Decaymentioning

confidence: 99%

“…where λ J J is a spin factor [17], γ = √ 1 − (α Z) 2 with Z the atomic number of the daughter nucleus and the upper (lower) sign refers to electron (positron) decay. Following Eq.…”

Section: Correlations In Allowed β Decaymentioning

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%

“…Nuclear β decay and neutron decay have played a crucial role in the development of the "V − A" theory of the weak interaction, which was eventually embedded in the wider framework of the SM [1,2]. Today, one of the main motivations for improving the experimental sensitivities of precision experiments in nuclear and neutron decays is the search for possible non-SM or "exotic" interactions that would manifest themselves through genuine scalar or tensor terms in semi-leptonic weak processes.…”

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: 99%

“…where λ J J is a spin factor [17], γ = √ 1 − (α Z) 2 with Z the atomic number of the daughter nucleus and the upper (lower) sign refers to electron (positron) decay. Following Eq.…”

Section: Correlations In Allowed β Decaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prospects for precision measurements in nuclear decay in the LHC era

2013

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“…However, the current upper limits for scalar/tensor coupling constants in nuclear -decay, relative to the vector/axial-vector ones, are as high as ~7% [1]. One way to extend the Standard Model in order to build a more fundamental theory is to check its basic assumptions (e.g.…”

Section: Introductionmentioning

confidence: 99%

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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Exotic Nuclear Beam Facilities

Geißel

Huyse

Münzenberg

et al. 2003

Digital Encyclopedia of Applied Physics

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The knowledge of exotic nuclei properties is essential for the understanding of the strong interaction and the element synthesis in the cosmos. Exotic nuclides are short lived and therefore, cannot be found on Earth but are still produced in stars. To study such atomic nuclei, one has to produce them with nuclear reactions in the laboratory and to separate them with special tools, from all the inevitable abundant background. The production and separation of these exotic nuclear beams can be performed with in‐flight or isotope separation on line facilities or hybrid systems of these two main scenarios. An exotic nuclear beam facility consists mainly of a combination of the production and the separation part as well as a post‐acceleration unit for the case that the experiment needs beams with kinetic energies and emittances different from that what the separator can provide. The challenge to investigate exotic nuclei is that they are characterized by very low production cross sections and short half‐lives. Different reactions to create exotic nuclei, and the physics and techniques of modern separation methods are discussed. We present the recent progress made in studying exotic nuclei by new accelerator developments, powerful separators combined with high‐resolution spectrometers and storage devices, and efficient detector systems. This chapter ends with the description of some recent discoveries with exotic nuclei and the motivation for the next‐generation facilities.

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Tests of the standard electroweak model in nuclear beta decay

Cited by 343 publications

References 284 publications

Prospects for precision measurements in nuclear decay in the LHC era

Prospects for precision measurements in nuclear decay in the LHC era

Search for a Scalar Component in the Weak Interaction

Exotic Nuclear Beam Facilities

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