@Article{Dai_etal2019,
author="Dai, L. R.
and Yu, Q. X.
and Oset, E.",
title="Triangle singularity in tau(-) -> nu(tau)pi(-) f(0)(980) (a(0)(980)) decays",
journal="Physical Review D",
year="2019",
publisher="Amer Physical Soc",
volume="99",
number="1",
pages="016021--13pp",
abstract="We study the triangle mechanism for the decay tau(-) -> nu(tau)pi(-) f(0)(980) with the f(0)(980) decaying into pi(+) pi(-). The mechanism for this process is initiated by tau(-) -> nu K-tau*(0) K- followed by the K*(0) decay into pi K--(+), then the K- K+ produce the f(0)(980) through a triangle loop containing K* K+ K- which develops a singularity around 1420 MeV in the pi f(0)(980) invariant mass. We find a narrow peak in the pi(+) pi(-) invariant mass distribution, which originates from the f(0)(980) amplitude. Similarly, we also study the triangle mechanism for the decay tau -> nu pi(-) a(0)(980), with the a(0)(980) decaying into pi(0)eta.The formalism leads to final branching ratios for pi(-) f(0)(980) and pi(-) a(0)(980) of the order of 4 x 10(-4) and 7 x 10(-5), respectively, which are within present measurable range. Experimental verification of these predictions will shed light on the nature of the scalar mesons and on the origin of the {\textquoteleft}{\textquoteleft}a(1)(1420){\textquoteright}{\textquoteright} peak observed in other reactions.",
optnote="WOS:000457697500012",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3905), last updated on Tue, 19 Feb 2019 08:36:16 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.99.016021",
opturl="https://arxiv.org/abs/1809.11007",
opturl="https://doi.org/10.1103/PhysRevD.99.016021",
language="English"
}