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Can the nature ofa0(980)be tested in theDs+→π+π0ηdecay?
Physical Review D ( IF 5 ) Pub Date : 2021-06-21 , DOI: 10.1103/physrevd.103.116016
Xi-Zhe Ling , Ming-Zhu Liu , Jun-Xu Lu , Li-Sheng Geng , Ju-Jun Xie

From the amplitude analysis of the Ds+π+π0η decay, the BESIII Collaboration first observed the Ds+a0(980)+π0 and Ds+a0(980)0π+ decay modes, which are expected to occur through the pure W-annihilation processes. The measured branching fraction B[Ds+a0(980)+(0)π0(+),a0(980)+(0)π+(0)η] is, however, found to be larger than those of known W-annihilation decays by 1 order of magnitude. This apparent contradiction can be reconciled if the two decays are induced by internal W-conversion or external W-emission mechanisms instead of a W-annihilation mechanism. In this work, we propose that the Ds+ decay proceeds via both the external and internal W-emission instead of W-annihilation mechanisms. In such a scenario, we perform a study of the Ds+π+π0η decay by taking into account the contributions from the tree diagram Ds+ρ+ηπ+π0η and the intermediate ρ+η and K*K¯/KK¯* triangle diagrams. The intermediate a0(980) state can be dynamically generated from the final state interactions of coupled KK¯ and πη channels, and it is shown that the experimental data can be described fairly well, which supports the interpretation of a0(980) as a molecular state.

中文翻译:

a0(980)的性质能否在Ds+→π+π0η衰变中检验?

从振幅分析 D+π+π0η 衰变,BESIII 合作首先观察到 D+一种0(980)+π0D+一种0(980)0π+ 衰减模式,预计会通过纯 - 湮灭过程。测得的支化分数[D+一种0(980)+(0)π0(+),一种0(980)+(0)π+(0)η] 然而,发现比已知的要大 -湮灭衰减1个数量级。如果这两种衰变是由内部因素引起的,那么这种明显的矛盾就可以调和。- 转换或外部 - 排放机制而不是 - 歼灭机制。在这项工作中,我们建议将D+ 衰变通过外部和内部进行 - 排放而不是 - 歼灭机制。在这种情况下,我们对D+π+π0η 通过考虑树形图的贡献来衰减 D+ρ+ηπ+π0η 和中间 ρ+η*¯/¯*三角图。中间体一种0(980) 状态可以从耦合的最终状态交互中动态生成 ¯πη 通道,并且表明实验数据可以很好地描述,这支持解释 一种0(980) 作为分子状态。
更新日期:2021-06-21
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