SU(3) symmetry and its breaking effects in semileptonic heavy baryon decays
SU(3) symmetry and its breaking effects in semileptonic heavy baryon decays
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DOI：
10.1016/j.physletb.2021.136765
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发表时间：
2021-10
影响因子：
4.4
通讯作者：
Xiao-Gang He;Feiran Huang;Wei Wang;Zhi-Peng Xing
中科院分区：
文献类型：
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作者：
Xiao-Gang He;Feiran Huang;Wei Wang;Zhi-Peng Xing
利用味SU（3）对称性分析了反三重态粲重子（Λ c+，Λ c+，0）的半轻子衰变，发现B（Λ c→ Λ c + ν e）的实验数据表明：B（Λ c 0→ Λ c − e+ ν e）=（4.10±0.46）%，B（Λ c 0→ Λ c − μ+ ν μ）=（3.98±0.57）%.当这个预言与最近贝儿合作组的实验结果B（ε c 0→ ε − e+ ν e）=（1.31±0.04±0.07±0.38）%和B（ε c 0→ ε − μ+ ν μ）=（1.27±0.06±0.10±0.37）%相对照时，发现SU（3）对称性被严重破缺。然后我们考虑了SU（3）破缺效应在衰变振幅和反三重态与六重态粲化重子之间的混合效应。我们发现，相关的数据可以容纳在不同的情况下，但突破的影响是不可避免的大。在一些有趣的场景中，我们还探索了这些场景中的可测试含义，这些场景可以通过更多的数据进行严格的测试。对反三重态美重子到八重态重子和反三重态粲重子的半轻子衰变也作了类似的分析。SU（3）对这些衰变的有效性也可以在数据可用时进行检验。
We employ the flavor SU (3) symmetry to analyze semileptonic decays of anti-triplet charmed baryons (Λ c+, Ξ c+, 0) and find that the experimental data on B (Λ c→ Λ ℓ+ ν ℓ) implies B (Ξ c 0→ Ξ− e+ ν e)=(4.10±0.46)% and B (Ξ c 0→ Ξ− μ+ ν μ)=(3.98±0.57)%. When this prediction is confronted with recent experimental results from Belle collaboration B (Ξ c 0→ Ξ− e+ ν e)=(1.31±0.04±0.07±0.38)% and B (Ξ c 0→ Ξ− μ+ ν μ)=(1.27±0.06±0.10±0.37)%, it is found that the SU (3) symmetry is severely broken. We then consider the generic SU (3) breaking effects both in decay amplitudes and the mixing effect between the anti-triplet and sextet charmed baryons. We find that the pertinent data can be accommodated in different scenarios but the breaking effects are inevitably large. In some interesting scenarios, we also explore the testable implications in these scenarios which can be stringently tested with more data become available. Similar analyses are carried out for the semileptonic decays of anti-triplet beauty baryons to octet baryons and anti-triplet charmed baryons. The validity of SU (3) for these decays can also be examined when data become available.