Find Paper, Faster
Example:10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Triangle mechanism in the decay processJ/ψ→K−K+a1(1260)
Physical Review D  (IF5.296),  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).