Nab: Measurement principles, apparatus and uncertainties

Počanić, D.; Alarcón, R.; Alonzi, L. P.; Baeßler, S.; Balascuta, S.; Bowman, J. D.; Bychkov, M.; Byrne, J.; Calarco, J. R.; Cianciolo, V.; Crawford, Christopher; Frlež, E.; Gericke, Michael; Greene, Geoffrey L.; Grzywacz, R.; Gudkov, Vladimir; Hersman, F. W.; Klein, A.; Martin, J. W.; Page, S. A.; Palladino, A.; Penttilä, S. I.; Rykaczewski, K. P.; Wilburn, W. S.; Young, A. R.; Young, G. R.

doi:10.1016/j.nima.2009.07.065

Cited by 64 publications

(102 citation statements)

References 11 publications

(13 reference statements)

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“…Several experiments are currently ongoing aiming at improved measurements of a in neutron decay [86][87][88]. Such efforts are primarily motivated by the extraction of the ratio g A /g V using another observable than the β asymmetry parameter, A, in order to determine the V ud matrix element from the neutron lifetime.…”

Section: The βν Angular Correlation Amentioning

confidence: 99%

“…Such efforts are primarily motivated by the extraction of the ratio g A /g V using another observable than the β asymmetry parameter, A, in order to determine the V ud matrix element from the neutron lifetime. The anticipated precision goals on δa/a of these experiments are of <1% for aCORN [87] <0.5% for aSPECT [86] and 0.1% for Nab [88]. Significant improvements in precision are also expected to be achieved with the PERC spectrometer [89] in the measurement of several correlation parameters.…”

Section: The βν Angular Correlation Amentioning

confidence: 99%

“…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 Nab collaboration will use a cold neutron beam at the Fundamental Neutron Physics Beamline of the Spallation Neutron Source in Oak Ridge [88]. The setup uses a field-expansion magnetic spectrometer that confines electrons and protons toward segmented Si detectors.…”

Section: The Fierz Interference Term Bmentioning

confidence: 99%

“…The setup uses a field-expansion magnetic spectrometer that confines electrons and protons toward segmented Si detectors. The anticipated precision goal for the direct measurement of b is δb = 3 × 10 −3 [88] and is aimed to provide an independent limit on exotic tensor couplings.…”

Section: The Fierz Interference Term Bmentioning

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: The βν Angular Correlation Amentioning

confidence: 99%

Section: The βν Angular Correlation Amentioning

confidence: 99%

Section: The βν Angular Correlation Amentioning

confidence: 99%

Section: The Fierz Interference Term Bmentioning

confidence: 99%

Section: The Fierz Interference Term Bmentioning

confidence: 99%

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Prospects for precision measurements in nuclear decay in the LHC era

2013

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Non-standard charged current interactions: beta decays versus the LHC

Cirigliano

González–Alonso

Graesser

2013

J. High Energ. Phys.

156

262

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We discuss low-energy and collider constraints on the effective couplings characterizing non-standard charged current interactions. A direct comparison of low-energy and LHC probes can be performed within an effective theory framework, when the new physics mediating these interactions originates in the multi-TeV scale. We find that for the effective couplings involving right-handed neutrinos the LHC bounds from pp → e + M ET + X are at the (sub)percent level, already stronger than those from β decays. For operators involving left-handed neutrinos, the (axial-)vector and pseudo-scalar effective couplings are best probed at low energy, while scalar and tensor couplings are currently probed at the same level by beta decays and the LHC channels pp → e + M ET + X and, by using SU(2) gauge invariance, pp → e + e − + X. Future beta decay experiments at the 0.1% level or better will compete in sensitivity with higher statistics and higher energy data from the LHC.

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Sensitivity of future tritium decay experiments to New Physics

Deppisch

Wenna

2023

J. High Energ. Phys.

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Tritium beta-decay is the most promising approach to measure the absolute masses of active light neutrinos in the laboratory and in a model-independent fashion. The development of Cyclotron Radiation Emission Spectroscopy techniques and the use of atomic tritium has the potential to improve the current limits by an order of magnitude in future experiments. In this paper, we analyse the potential sensitivity of such future searches to keV-mass sterile neutrinos and exotic interactions of either the active or sterile neutrinos. We calculate the relevant decay distributions in both energy and angle of the emitted electron with respect to a potential polarisation of the tritium, including the interference with the Standard Model case as well as incorporating relevant final state corrections for atomic tritium. We present projected sensitivities on the active-sterile neutrino mixing and effective coupling constants of exotic currents, demonstrating the potential to probe New Physics in tritium experiments.

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Nab: Measurement principles, apparatus and uncertainties

Cited by 64 publications

References 11 publications

Prospects for precision measurements in nuclear decay in the LHC era

Prospects for precision measurements in nuclear decay in the LHC era

Non-standard charged current interactions: beta decays versus the LHC

Sensitivity of future tritium decay experiments to New Physics

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