| Autor: |
D. A. Park, T. A. Romanowski, Roland Winston, B. Nelson, C.E.W. Ward, J. M. Watson, A. Lesnik, E. C. Swallow, P. Keller, W. E. Keig |
| Rok vydání: |
1982 |
| Předmět: |
|
| Zdroj: |
Physical Review Letters. 48:971-974 |
| ISSN: |
0031-9007 |
| DOI: |
10.1103/physrevlett.48.971 |
| Popis: |
The electron asymmetry was measured in the beta decay of polarized sigma hyperons ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\rightarrow}n{e}^{\ensuremath{-}}\overline{\ensuremath{\nu}}$ produced in the reaction ${K}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ at the ${{Y}_{0}}^{*}(1520)$ resonance. Particles were tracked in a magnetic spectrometer and a large-acceptance, segmented, gas-Cherenkov-scintillation counter array identified electrons. A maximum-likelihood analysis based on 193 events yields the electron asymmetry of ${\ensuremath{\alpha}}_{e}=0.35\ifmmode\pm\else\textpm\fi{}0.29$. The result favors a positive value for $\frac{{g}_{1}}{{f}_{1}}$ which is opposite to the Cabibbo-favored sign. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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