Triangle singularity in τ- → ντπ- f0(980) (a0(980)) decays

被引：18
作者：
Dai, L. R. [1 ,2 ,3 ]
Yu, Q. X. [2 ,3 ,4 ]
Oset, E. [2 ,3 ]
机构：
[1] Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China
[2] Univ Valencia, CSIC, Ctr Mixto, Dept Fis Teor,Inst Invest Paterna, Aptdo 22085, Valencia 46071, Spain
[3] Univ Valencia, CSIC, Ctr Mixto, Inst Invest Paterna,IFIC, Aptdo 22085, Valencia 46071, Spain
[4] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China
来源：
PHYSICAL REVIEW D | 2019年 / 99卷 / 01期
基金：
中国国家自然科学基金;
关键词：
SPECTRAL FUNCTIONS; ETA; F(0)(500); PHYSICS; VECTOR; LAGRANGIANS; RESONANCES; A1;
D O I：
10.1103/PhysRevD.99.016021
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 "a(1)(1420)" peak observed in other reactions.
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页数：13
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