دورية أكاديمية
Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam
| العنوان: | Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam |
|---|---|
| المؤلفون: | Märkisch, B., Mest, H., Saul, H., Wang, X., Abele, H., Dubbers, D., Klopf, M., Petoukhov, A., Roick, C., Soldner, T., Werder, D. |
| المساهمون: | Institut Laue-Langevin (ILL), ILL |
| المصدر: | ISSN: 0031-9007. |
| بيانات النشر: | HAL CCSD American Physical Society |
| سنة النشر: | 2019 |
| المجموعة: | Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
| مصطلحات موضوعية: | precision measurement, parity: violation, coupling constant: axial-vector, n: beam, beam: pulsed, Nuclear Physics, S017BA, experimental results, asymmetry, electron: spectrum, CKM matrix, interaction: tensor, left-handed, S017AV, suppression, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] |
| الوصف: | International audience ; We present a precision measurement of the axial-vector coupling constant gA in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this purpose. By this method, leading sources of systematic uncertainty are suppressed. From the electron spectra we obtain λ=gA/gV=-1.27641(45)stat(33)sys, which confirms recent measurements with improved precision. This corresponds to a value of the parity violating beta asymmetry parameter of A0=-0.11985(17)stat(12)sys. We discuss implications on the Cabibbo-Kobayashi-Maskawa matrix element Vud and derive a limit on left-handed tensor interaction. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | info:eu-repo/semantics/altIdentifier/arxiv/1812.04666; hal-01974755; https://hal.archives-ouvertes.fr/hal-01974755Test; INSPIRE: 1708714; ARXIV: 1812.04666 |
| DOI: | 10.1103/PhysRevLett.122.242501 |
| الإتاحة: | https://doi.org/10.1103/PhysRevLett.122.242501Test https://hal.archives-ouvertes.fr/hal-01974755Test |
| رقم الانضمام: | edsbas.F81B9EE8 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1103/PhysRevLett.122.242501 |
|---|