SEMILEPTONIC HYPERON DECAYS
SEMILEPTONIC HYPERON DECAYS
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DOI：
10.1146/annurev.nucl.53.013103.155258
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
N. Cabibbo;E. Swallow;R. Winston
中科院分区：
文献类型：
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作者：
N. Cabibbo;E. Swallow;R. Winston
▪ Abstract We review the status of hyperon semileptonic decays. The central issue is the Vus element of the CKM matrix, for which we obtain Vus = 0.2250 (27). This value is similar in precision to the one derived from Kl3, but higher, and in better agreement with the unitarity requirement, |Vud|2 + |us|2 + |Vub|2 = 1. We find that the Cabibbo model gives an excellent fit to baryon–beta-decay form-factor data (χ2 = 2.96 for 3 degrees of freedom) with F + D = 1.2670 ± 0.0030, F − D = −0.341 ± 0.016, and no indication of flavor-SU(3)–breaking effects. We indicate the need for more experimental and theoretical work, both on hyperon beta decays and on Kl3 decays.
