Two-Flavor Simulations of ρ(770) and the Role of the K(K)over-bar Channel

被引：44

作者：

Hu, B. ^{[1
]}

Molina, R. ^{[1
]}

Doring, M. ^{[1
,2
]}

Alexandru, A. ^{[1
]}

机构：

[1] George Washington Univ, Washington, DC 20052 USA

[2] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 12期

基金：

美国国家科学基金会;

关键词：

CHIRAL PERTURBATION-THEORY; FINITE-VOLUME; SCATTERING; PHASE; SPECTRUM; STATES;

D O I：

10.1103/PhysRevLett.117.122001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The rho(770) meson is the most extensively studied resonance in lattice QCD simulations in two (N-f = 2) and three (N-f = 2 + 1) flavor formulations. We analyze N-f = 2 lattice scattering data using unitarized chiral perturbation theory, allowing not only for the extrapolation in mass but also in flavor, N-f = 2 -> N-f = 2 + 1. The flavor extrapolation requires information from a global fit to pi pi and pi K phase shifts from experiment. While the chiral extrapolation of N-f = 2 lattice data leads to masses of the rho(770) meson far below the experimental one, we find that the missing K (K) over bar channel is able to explain this discrepancy.

引用

页数：6

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