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 4𝜋 by the aSPECT spectrometer. With 𝑎=−0.104 02(82) the new va...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
2024
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| 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 
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| Verfasserangaben: | M. Beck, W. Heil, Ch. Schmidt, S. Baeßler, F. Glück, G. Konrad, and U. Schmidt |
MARC
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| 245 | 1 | 0 | |a Reanalysis of the β - ν[bar]e angular correlation measurement from the aSPECT experiment with new constraints on Fierz interference |c M. Beck, W. Heil, Ch. Schmidt, S. Baeßler, F. Glück, G. Konrad, and U. Schmidt |
| 246 | 3 | 3 | |a Reanalysis of the β - ν[bar] e angular correlation measurement from the aSPECT experiment with new constraints on Fierz interference |
| 246 | 3 | 3 | |a Reanalysis of the beta - nu [bar] e angular correlation measurement from the aSPECT experiment with new constraints on Fierz interference |
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| 520 | |a On the basis of revisions of some of the systematic errors, we reanalyzed the electron-antineutrino angular correlation ( coefficient) in free neutron decay inferred from the recoil energy spectrum of the protons which are detected in 4 by the aSPECT spectrometer. With =−0.104 02(82) the new value differs only marginally from the one published in 2020. The experiment also has sensitivity to , the Fierz interference term. From a correlated (,) fit to the proton recoil spectrum, we derive a limit of =−0.0098(193) which translates into a somewhat improved 90% confidence interval region of −0.041 ≤ ≤0.022 on this hypothetical term. Tighter constraints on can be set from a combined [shown as superscript ()] analysis of the PERKEO III ( asymmetry) and aSPECT measurement which suggests a finite value of with ()=−0.0181±0.0065 deviating by 2.82 from the standard model. | ||
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