@Article{Xiao_etal2024,
author="Xiao, C. W.
and Dias, J. M.
and Dai, L. R.
and Liang, W. H.
and Oset, E.",
title="Triangle singularity in the J/$\psi$ {\textrightarrow} ϕ $\pi$+ a-0($\pi$-$\eta$) ,ϕ $\pi$- a+0($\pi$+$\eta$) decays",
journal="Physical Review D",
year="2024",
publisher="Amer Physical Soc",
volume="109",
number="7",
pages="074033--11pp",
abstract="We study the J= psi -> phi pi + a 0 ( 980 ) -- ( a -- 0 -> pi -- eta ) decay, evaluating the double mass distribution in terms of the pi -- eta and pi + a -- 0 invariant masses. We show that the pi -- eta mass distribution exhibits the typical cusp structure of the a 0 ( 980 ) seen in recent high statistics experiments, and the pi + a -- 0 spectrum shows clearly a peak around M inv ( pi + a -- 0 ) = 1420 MeV, corresponding to a triangle singularity. When integrating over the two invariant masses we find a branching ratio for this decay of the order of 10 -- 5 , which is easily accessible in present laboratories. We also call attention to the fact that the signal obtained is compatible with a bump experimentally observed in the eta pi + pi -- mass distribution in the J= psi -> phi eta pi + pi -- decay and encourage further analysis to extract from there the phi pi + a -- 0 and phi pi -- a + 0 decay modes.",
optnote="WOS:001236271000012",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=6212), last updated on Mon, 29 Jul 2024 06:47:10 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.109.074033",
opturl="https://arxiv.org/abs/2402.17584",
opturl="https://doi.org/10.1103/PhysRevD.109.074033",
language="English"
}