a1(1420) peak as the πf0(980) decay mode of the a1(1260)

被引：61
作者：
Aceti, F. [1 ,2 ]
Dai, L. R. [1 ,2 ,3 ]
Oset, E. [1 ,2 ,4 ]
机构：
[1] Univ Valencia, Dept Fis Teor, CSIC, Inst Invest Paterna, Aptdo 22085, Valencia 46071, Spain
[2] Univ Valencia, IFIC, Ctr Mixto, CSIC,Inst Invest Paterna, Aptdo 22085, Valencia 46071, Spain
[3] Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China
[4] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
来源：
PHYSICAL REVIEW D | 2016年 / 94卷 / 09期
基金：
中国国家自然科学基金;
关键词：
GAUGE BOSON; MESON;
D O I：
10.1103/PhysRevD.94.096015
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We study the decay mode of the a(1)(1260) into a pi(+) in p wave and the f(0)(980) that decays into pi(+)pi(-) in s wave. The mechanism proceeds via a triangular mechanism where the a(1)(1260) decays into K*K-, the K* decays to an external pi(+) and an internal K that fuses with the (K) over bar producing the f(0)(980) resonance. The mechanism develops a singularity at a mass of the a(1)(1260) around 1420 MeV, producing a peak in the cross section of the pp reaction, used to generate the mesonic final state, which provides a natural explanation of all the features observed in the COMPASS experiment, where a peak observed at this energy is tentatively associated to a new resonance called a(1)(1420). On the other hand, the triangular singularity studied here gives rise to a remarkable feature, where a peak is seen for a certain decay channel of a resonance at an energy about 200 MeV higher than its nominal mass.
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