PT Journal
AU Liang, WH
   Chen, HX
   Oset, E
   Wang, E
TI Triangle singularity in the J/psi -> K+K- f(0)(980)(a(0)(980)) decays
SO European Physical Journal C
JI Eur. Phys. J. C
PY 2019
BP 411 - 11pp
VL 79
IS 5
DI 10.1140/epjc/s10052-019-6928-8
LA English
AB We study the J/psi -> K+K- f(0)(980)(a(0)(980)) reaction and find that the mechanism to produce this decay develops a triangle singularity around M-inv(K- f(0)/K- a(0)) approximate to 1515 MeV. The differential width d Gamma/dM(inv)(K- f(0)/K- a(0)) shows a rapid growth around the invariant mass being 1515 MeV as a consequence of the triangle singularity of this mechanism, which is directly tied to the nature of the f(0)(980) and a(0)(980) as dynamically generated resonances from the interaction of pseudoscalar mesons. The branching ratios obtained for the J/psi -> K+K- f(0)(980)(a(0)(980)) decays are of the order of 10(-5), accessible in present facilities, and we argue that their observation should provide relevant information concerning the nature of the low-lying scalar mesons.
ER