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Triangle mechanism in the decay processJ/ψ→K−K+a1(1260)
Physical Review D ( IF 4.6 ) Pub Date : 2021-10-19 , DOI: 10.1103/physrevd.104.074016
Xuan Luo , Dazhuang He , Yiling Xie , Hao Sun

The role of the triangle mechanism in the decay process J/ψKK+a1(1260) is probed. In this mechanism, a close-up resonance with mass 1823 MeV and width 122 MeV decays into K*ϕ,K*Kπ and then K*K¯ fuses into the a1(1260) resonance. We find that this mechanism leads to a triangle singularity around Minv(Ka1(1260))1920MeV, where the axial-vector meson a1(1260) is considered as a dynamically generated resonance. With the help of the triangle mechanism we find sizable branching ratios Br(J/ψKK+a1(1260),a1πρ)=1.210×105 and Br(J/ψKK+a1(1260))=3.501×105. Such an effect from the triangle mechanism of the decay process could be investigated by such as BESIII, LHCb and Belle-II experiments. This potential investigation can help us obtain the information of the axial-vector meson a1(1260).

中文翻译:

衰变过程中的三角机制J/ψ→K−K+a1(1260)

三角机制在衰变过程中的作用 J/ψ-+一种1(1260)被探测。在这种机制中,质量为 1823 MeV、宽度为 122 MeV 的近距离共振衰减为*φ,*π 进而 *¯ 熔断成 一种1(1260)谐振。我们发现这种机制导致了周围的三角形奇点投资(-一种1(1260))1920年电动汽车,其中轴矢量介子 一种1(1260)被认为是动态产生的共振。在三角机制的帮助下,我们找到了相当大的分支率(J/ψ-+一种1(1260),一种1πρ)=1.210×10-5(J/ψ-+一种1(1260))=3.501×10-5. 这种衰变过程三角机制的影响可以通过 BESIII、LHCb 和 Belle-II 等实验来研究。这种潜在的调查可以帮助我们获得轴矢量介子的信息一种1(1260).
更新日期:2021-10-19
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