Zc(3900) as a (D)over-barD* molecule from the pole counting rule

被引：34

作者：

Gong, Qin-Rong ^{[1
,2
]}

Guo, Zhi-Hui ^{[3
,4
,5
]}

Meng, Ce ^{[6
]}

Tang, Guang-Yi ^{[7
]}

Wang, Yu-Fei ^{[1
,2
]}

Zheng, Han-Qing ^{[1
,2
,8
]}

机构：

[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Peoples R China

[4] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[5] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

[6] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[7] Inst High Energy Phys, Beijing 100049, Peoples R China

[8] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 11期

关键词：

TRIANGLE SINGULARITIES; STATES; CHARMONIUM; PARTICLES; MODEL; MASS; QCD;

D O I：

10.1103/PhysRevD.94.114019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A comprehensive study on the nature of the Zc(3900) resonant structure is carried out in this work. By constructing the pertinent effective Lagrangians and considering the important final-state-interaction effects, we first give a unified description to all the relevant experimental data available, including the J/psi pi and pi invariant mass distributions from the e(+)e(-) -> J/psi pi process, the h(c)pi distribution from e(+)e(-) -> h(c)pi pi, and also the D (D) over bar* spectrum in the e(+)e(-) -> D (D) over bar*pi process. After fitting the unknown parameters to the previous data, we search the pole in the complex energy plane and find only one pole in the nearby energy region in different Riemann sheets. Therefore, we conclude that Z(c)(3900) is of D (D) over bar* molecular nature, according to the pole counting rule method [Nucl. Phys. A543, 632 (1992); Phys. Rev. D 35, 1633 (1987)]. We emphasize that the conclusion based upon the pole counting method is not trivial, since both the D (D) over bar* contact interactions and the explicit Z(c) exchanges are introduced in our analyses and

引用

页数：17

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