论文标题
W-交换贡献在底部baryon的HADRONIC衰减中
W-exchange contribution in hadronic decays of bottom baryon
论文作者
论文摘要
研究了以W交换为主导的λ_{B}的非质量衰减。特别是，衰减模式\ varlambda_ {b} \ to \ vardelta^{0} d^{0}，\ vardelta^{ - } d^{+}，σ^{* - * - } λ_{b} \ tod_ {c}^{*+}π^{ - }，σ_{c}^{*0}π^{0}，ξ_{c}^{*}^{*0} k^{0} k^{0} k^{0} and \ varlambda_}分析。在另一个方面，研究了Anstaz中的衰减λ_{b} \toλ_{c}^{+}π^{ - }。结果表明，分解仅有助于均衡（S-WAVE）幅度A。因此，分解给出了不对称参数α= 0。然而，对平等保护的主要贡献（p波）幅度B来自W交换，即来自Baryon Pole，给出了不对称参数α= -0.77。
The nonleptonic decays of Λ_{b} that are dominated by W exchange are studied. In particular, the decay modes \varLambda_{b}\to\varDelta^{0}D^{0},\varDelta^{-}D^{+},Σ^{*-}D_{s}^{+}, Λ_{b}\toΣ_{c}^{*+}π^{-},Σ_{c}^{*0}π^{0},Ξ_{c}^{*0}K^{0} and \varLambda_{b}\toΣ_{c}^{+}π^{-} are analyzed. In an another aspect, the decay Λ_{b}\toΛ_{c}^{+}π^{-} in the factorization anstaz is studied. It is shown that factorization contributes to parity-violating (s-wave) amplitude A only. Hence factorization gives asymmetry parameter α=0. However, the dominant contribution to parity conserving (p-wave) amplitude B comes from W exchange, i.e., from the baryon pole, giving asymmetry parameter α=-0.77.
