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Reanalysis of the β - ν[bar]e angular correlation measurement from the aSPECT experiment with new constraints on Fierz interference

On the basis of revisions of some of the systematic errors, we reanalyzed the electron-antineutrino angular correlation (𝑎 coefficient) in free neutron decay inferred from the recoil energy spectrum of the protons which are detected in 4⁢𝜋 by the aSPECT spectrometer. With 𝑎=−0.104 02⁢(82) the new va...

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Hauptverfasser: Beck, Marcus (VerfasserIn) , Heil, W. (VerfasserIn) , Schmidt, Ch. (VerfasserIn) , Baeßler, S. (VerfasserIn) , Glück, F. (VerfasserIn) , Konrad, G. (VerfasserIn) , Schmidt, Ulrich (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 2024
In: Physical review letters
Year: 2024, Jahrgang: 132, Heft: 10, Pages: 102501-1 - 102501-6
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.102501
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.132.102501
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.132.102501
Volltext
Verfasserangaben:M. Beck, W. Heil, Ch. Schmidt, S. Baeßler, F. Glück, G. Konrad, and U. Schmidt
Beschreibung
Zusammenfassung:On the basis of revisions of some of the systematic errors, we reanalyzed the electron-antineutrino angular correlation (𝑎 coefficient) in free neutron decay inferred from the recoil energy spectrum of the protons which are detected in 4⁢𝜋 by the aSPECT spectrometer. With 𝑎=−0.104 02⁢(82) the new value differs only marginally from the one published in 2020. The experiment also has sensitivity to 𝑏, the Fierz interference term. From a correlated (𝑏,𝑎) fit to the proton recoil spectrum, we derive a limit of 𝑏 =−0.0098⁢(193) which translates into a somewhat improved 90% confidence interval region of −0.041 ≤𝑏 ≤0.022 on this hypothetical term. Tighter constraints on 𝑏 can be set from a combined [shown as superscript (𝑐)] analysis of the PERKEO III (𝛽 asymmetry) and aSPECT measurement which suggests a finite value of 𝑏 with 𝑏(𝑐)=−0.0181±0.0065 deviating by 2.82⁢𝜎 from the standard model.
Beschreibung:Online veröffentlicht: 7. März 2024
Das nu-Zeichen steht im Titel mit Oberstrich, das e ist tiefgestellt
Gesehen am 02.04.2025
Beschreibung:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.132.102501

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