Coupled ππ, K(K)over-bar scattering in P-wave and the ρ resonance from lattice QCD

被引：167
|
作者：
Wilson, David J. [1 ]
Briceno, Raul A. [2 ]
Dudek, Jozef J. [1 ,2 ]
Edwards, Robert G. [2 ]
Thomas, Christopher E. [3 ]
机构：
[1] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA
[2] Jefferson Lab, Ctr Theory, Newport News, VA 23606 USA
[3] Univ Cambridge, Ctr Math Sci, Dept Appl Math & Theoret Phys, Cambridge CB3 0WA, England
来源：
PHYSICAL REVIEW D | 2015年 / 92卷 / 09期
基金：
美国国家科学基金会; 英国科学技术设施理事会;
关键词：
STATES;
D O I：
10.1103/PhysRevD.92.094502
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We determine elastic and coupled-channel amplitudes for isospin-1 meson-meson scattering in P wave, by calculating correlation functions using lattice QCD with light quark masses such that m(pi) = 236 MeV in a cubic volume of similar to(4 fm)(3). Variational analyses of large matrices of correlation functions computed using operator constructions resembling pi pi, K (K) over bar and q (q) over bar, in several moving frames and several lattice irreducible representations, lead to discrete energy spectra from which scattering amplitudes are extracted. In the elastic pp scattering region we obtain a detailed energy dependence for the phase shift, corresponding to a. resonance, and we extend the analysis into the coupled-channel K (K) over bar region for the first time, finding a small coupling between the channels.
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页数：14
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