Triangle singularity enhancing isospin violation in Ds+ → π+π0f0 (980) and (B)over-bars0→ J/ψπ0f0 (980) decays

被引：2
|
作者：
Liang, Wei-Hong [1 ]
Sakai, S. [2 ,3 ]
Xie, Ju-Jun [4 ]
Oset, E. [2 ,3 ]
机构：
[1] Guangxi Normal Univ, Dept Phys, Guilin 541004, Peoples R China
[2] Ctr Mixto Univ Valencia, CSIC, Inst Invest Paterna, Dept Fis Teor, Aptdo 22085, Valencia 46071, Spain
[3] Ctr Mixto Univ Valencia, CSIC, Inst Invest Paterna, IFIC, Aptdo 22085, Valencia 46071, Spain
[4] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
来源：
MESON 2018 - 15TH INTERNATIONAL WORKSHOP ON MESON PHYSICS | 2019年 / 199卷
基金：
中国国家自然科学基金;
关键词：
F(0)(980); F(0)(500);
D O I：
10.1051/epjconf/201919904008
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We investigate isospin violation in the (B) over bar (0)(s) -> J/psi pi(0)a(0) (980)(f(0) (980)) and D-s(+)-> pi(+)pi(0)a(0) (980)(f(0)(980)) reactions, which proceed via a triangle mechanism. We show that the mechanism develops a singularity around the pi(0)f(0) (980) or pi(0)a(0)(980) invariant mass of 1420 MeV where the pi(0)f(0) and pi(0)a(0) decay modes are magnified and also the ratio of pi(0)f(0) to pi(0)a(0) production, stressing the role of the triangle singularities as a factor to enhance isospin violation. The measurement of these reactions would bring further information into the role of triangle singularities in isospin violation and the a(0) - f(0) mixing in particular and shed further light into the nature of the low lying scalar mesons.
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页数：6
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