论文标题
研究用拓扑图方法的两体非质子弱衰变
Studying Two-body Nonleptonic Weak Decays of Hyperons with Topological Diagram Approach
论文作者
论文摘要
已经测量了许多由$ u，d，s $ quarks组成的轻气囊的腐烂，这些测量结果将有助于我们了解轻气囊的衰减特性。在这项工作中，我们通过SU（3）风味对称性下的拓扑图方法（TDA）研究了两体非腿弱衰减的光baryon八八角$（T_8）$（T_8）$（T_8）$（T_8）$（T_ {10}）$。我们发现（1）tda和su（3）不可减至的表示方法（IRA）在$ t_ {10} \ to t^{（'）} _ {8,10} p_8 $中始终如一地匹配（$ p_8 $是light pseudscalar meson octet）; （2）几乎所有相关的$ \ MATHCAL {b}（t_ {10} \ to T_8 P_8）$可以通过使用$ \ Mathcal {B}（ω^ - ω^ - \ toξ^0π^0π^0π^ - ，ξ^ - ，ξ^-π^-π^-π^-π^0. $ \ nathcal {b}（t_ {10} \ to t {'} _ {10}π^ - ）$可以从$ \ Mathcal {b}的实验上限（ω^ - \ \ \ \ to to^0}π^ - ）$中的实验上限（ω^ - \ to tda and new new the Ira the Inty Inthe ynew in New Inther），当前的实验； （3）$ t_8 \ to t'_8 p_8 $衰减在TDA方面非常复杂，我们发现W-交换图通过使用相关的实验数据和ISOSPIN关系提供了很大甚至主导的贡献。
Many decays of light baryons consisting of light $u,d,s$ quarks have been measured, and these measurements will help us to understand the decay properties of light baryons. In this work, we study two-body nonleptonic weak decays of light baryon octet $(T_8)$ and baryon decuplet $(T_{10})$ by the topological diagram approach (TDA) under the SU(3) flavor symmetry for the first time. We find that (1) the TDA and the SU(3) irreducible representation approach (IRA) match consistently in $T_{10}\to T^{(')}_{8,10}P_8$ ($P_8$ is the light pseudoscalar meson octet); (2) almost all relevant not-yet-measured $\mathcal{B}(T_{10}\to T_8 P_8)$ may be predicted by using three experimental data of $\mathcal{B}(Ω^-\to Ξ^0π^-,Ξ^-π^0,Λ^0K^-)$, and the upper limits of $\mathcal{B}(T_{10}\to T{'}_{10}π^-)$ may be obtained from the experimental upper limit of $\mathcal{B}(Ω^-\to Ξ^{*0}π^-)$ by both the TDA and the IRA together, nevertheless, all new predicted branching ratios are too small to br reached in current experiments; (3) $T_8\to T'_8 P_8$ decays are quite complex in terms of the TDA, and we find that W-exchange diagrams give large and even dominant contributions by using relevant experimental data and the isospin relations.
