An a0 resonance in strongly coupled πη, K(K)over-bar scattering from lattice QCD

被引：119
作者：
Dudek, Jozef J. [1 ,2 ]
Edwards, Robert G. [1 ]
Wilson, David J. [2 ,3 ]
机构：
[1] Jefferson Lab, Theory Ctr, 12000 Jefferson Ave, Newport News, VA 23606 USA
[2] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA
[3] Univ Cambridge, Ctr Math Sci, Dept Appl Math & Theoret Phys, Wilberforce Rd, Cambridge CB3 0WA, England
来源：
PHYSICAL REVIEW D | 2016年 / 93卷 / 09期
关键词：
CHANNEL ANALYSIS; SYSTEMS; ANNIHILATION; PARTICLES; STATES; MESON; REST;
D O I：
10.1103/PhysRevD.93.094506
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the first calculation of coupled-channel meson-meson scattering in the isospin = 1, G-parity negative sector, with channels pi eta, K (K) over bar and pi eta', in a first-principles approach to QCD. From the discrete spectrum of eigenstates in three volumes extracted from lattice QCD correlation functions we determine the energy dependence of the S-matrix, and find that the S-wave features a prominent cusplike structure in pi eta -> pi eta close to the K (K) over bar threshold coupled with a rapid turn-on of amplitudes leading to the K (K) over bar final state. This behavior is traced to an a(0)(980)-like resonance, strongly coupled to both pi eta and K (K) over bar, which is identified with a pole in the complex energy plane, appearing on only a single unphysical Riemann sheet. Consideration of D-wave scattering suggests a narrow tensor resonance at higher energy.
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页数：26
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