Scattering in the πN negative parity channel in lattice QCD

被引：78

作者：

Lang, C. B. ^{[1
]}

Verduci, V. ^{[1
]}

机构：

[1] Graz Univ, Inst Phys, A-8010 Graz, Austria

来源：

PHYSICAL REVIEW D | 2013年 / 87卷 / 05期

基金：

奥地利科学基金会;

关键词：

QUANTUM-FIELD THEORIES; VOLUME DEPENDENCE; ENERGY-SPECTRUM; RESONANCE; STATES; MESON;

D O I：

10.1103/PhysRevD.87.054502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the coupled pi N system (negative parity, isospin 1/2) based on a lattice QCD simulation for n(f) = 2 mass degenerate light quarks. Both standard 3-quark baryon operators as well as meson-baryon (4 + 1)-quark operators are included. This is an exploratory study for just one lattice size and lattice spacing and at a pion mass of 266 MeV. Using the distillation method and variational analysis we determine energy levels of the lowest eigenstates. Comparison with the results of simple 3-quark correlation studies exhibits drastic differences and a new level appears. A clearer picture of the negative parity nucleon spectrum emerges. For the parameters of the simulation we may assume elastic s-wave scattering and can derive values of the phase shift. DOI: 10.1103/PhysRevD.87.054502

引用

页数：12

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