A measurement of the antineutrino asymmetry B in free neutron decay

Kreuz, Michael; Söldner, T.; Baeßler, S.; Brand, B.; Glück, F.; Mayer, U.; Mund, D.; Nesvizhevsky, V. V.; Petoukhov, A.; Plonka, Christian; Reich, J.; Vogel, Christian; Abele, H.

doi:10.1016/j.physletb.2005.05.074

Cited by 31 publications

(33 citation statements)

References 20 publications

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“…The corrections, calculated in this paper, are positive and of order of magnitude larger compared with the absolute values of the corrections, calculated in [65]. The theoretical value B 0 = 0.9871(1) of the correlation coefficient B 0 , calculated for λ = −1.2750(9), agrees within 1.5 standard deviations with the experimental values B (83), obtained in [38,39] (see also [1]), [66] and [67], respectively, and within two standard deviations with the experimental one B (exp) 0 = 0.967 (12), obtained in [68].…”

Section: Standard Model Analysis Of Experimental Determination Of supporting

confidence: 87%

Neutronβ−decay as a laboratory for testing the standard model

2013

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We analyse the sensitivity of all experimentally observable asymmetries and energy distributions for the neutron β − -decay with a polarized neutron and unpolarised decay proton and electron and the lifetime of the neutron to contributions of order 10 −4 of interactions beyond the Standard model (SM). Since the asymmetries and energy distributions are expressed in terms of the correlation coefficients of the neutron β − -decay, in order to obtain a theoretical background for the analysis of contributions beyond the SM we revise the calculation of the correlation coefficients within the SM. We take into account a complete set of contributions, induced to next-to-leading order in the large proton mass expansion by the "weak magnetism" and the proton recoil, and the radiative corrections of order (α/π), calculated to leading order in the large proton mass expansion. We confirm the results, obtained in literature. The contributions of interactions beyond the SM we analyse in the linear approximation with respect to the Herczeg phenomenological coupling constants, introduced at the hadronic level. Such an approximation is good enough for the analysis of contributions of order 10 −4 of interactions beyond the SM. We show that in such an approximation the correlation coefficients depend only on the axial coupling constant, which absorbs the contributions of the Herczeg left-left and left-right lepton-nucleon current-current interactions (vector and axial-vector interactions beyond the SM), and the Herczeg scalar and tensor coupling constants. In the lifetime of the neutron in addition to the axial coupling constant the contributions of the Herczeg left-left and left-right lepton-nucleon current-current interactions (vector and axial-vector interactions beyond the SM) are absorbed by the Cabibbo-Kobayashi-Maskawa (CKM) matrix element.

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Section: Standard Model Analysis Of Experimental Determination Of supporting

confidence: 87%

Neutronβ−decay as a laboratory for testing the standard model

2013

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“…Examples are the electron-antineutrino correlation coefficient a [6][7][8], the beta asymmetry parameter A [9][10][11][12][13], the neutrino asymmetry parameter B [14,15] (reconstructed from proton and electron momenta), the proton asymmetry parameter C [16], the triple correlation coefficient D [17,18], the Fierz interference term b, and various correlation coefficients involving the electron spin [19,20]. Each coefficient in turn relates to an underlying broken symmetry.…”

Section: Neutron β-Decay Within Priority Area Bmentioning

confidence: 99%

Precision experiments with cold and ultra-cold neutrons

Abele

2016

Hyperfine Interact

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We present selected results from the first round of the Priority Programme SPP 1491. This programme gets funding from the German DFG and the Austrian FWF funding agencies. The aim of this programme is to address basic open questions in particle and astrophysics using a specific tool: the neutron, which allows the search for new physics becoming manifest itself as small deviations from expectations.Keywords Standard model neutron β-decay · The quantum bouncing ball qBOUNCE

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“…In principle, electron-proton coincidence measurements are possible in one single detector, as was shown in Refs. [9,24]. But with PERC dead time would be too long, in view of the high count rate and great length of the n-decay volume.…”

Section: Single-count Modementioning

confidence: 99%

A clean, bright, and versatile source of neutron decay products

Dubbers

Abele

Baeßler

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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We present a case study on a new type of cold neutron beam station for the investigation of angular correlations in the beta-decay of free neutrons. With this beam station, called PERC, the 'active decay volume' lies inside the neutron guide, and the charged neutron decay products are magnetically guided towards the end of the neutron guide. Hence, the guide delivers at its exit a beam of decay electrons and protons, under well-defined and precisely variable conditions, which can be well separated from the cold neutron beam. In this way a general-purpose source of neutron decay products is obtained which can be used for various different experiments in neutron decay correlation spectroscopy. A gain in phase space density of several orders of magnitude can be achieved with PERC, as compared to existing neutron decay spectrometers. Neutron beam related background is separately measurable in PERC, and magnetic mirror effects on the charged neutron decay products and edge effects in the active neutron beam volume are both strongly suppressed. Therefore the spectra and angular distributions of the emerging decay particles will be distortion-free on the level of 10^-4, more than 10 times better than achieved today.Comment: 20 pages, 6 figure

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A measurement of the antineutrino asymmetry B in free neutron decay

Cited by 31 publications

References 20 publications

Neutronβ−decay as a laboratory for testing the standard model

Neutronβ−decay as a laboratory for testing the standard model

Precision experiments with cold and ultra-cold neutrons

A clean, bright, and versatile source of neutron decay products

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