Lattice QCD Calculation of π π Scattering Length

• 作者: 傅子文
• 来源期刊: 理论物理通讯：英文版
• 学科: 物理学
• 关键词: 格点QCD 散射长度 计算 手征微扰理论 介子质量 子晶格 同位旋 费米子
• 年，卷（期）: 2012,（1）
• 页码范围: 78-84
• 页数: 7页
• 分类号: O572.33|O436.2
• 语种: 英文

摘要

We study s-wave pion-pion scattering length in lattice QCD for pion masses ranging from 330 MeV to 466 MeV. In the ＂Asqtad＂ improved staggered fermion formulation, we measure full ππ four-point correlators for isospin I = 0 and 2 channels, and use chiral perturbation theory at next-to-leading order to extrapolate our simulation results. Extrapolating to the physical pion mass yields scattering lengths as mna01=2 = -0.041 6（2） and mna01= 0.186（2） for isospin I = 2 and 0 channels, respectively. Our lattice simulation for ππ scattering length in I = 0 channel is an exploratory study, where we include the disconnected contribution, and our preliminary result is near to its experimental value. These simulations are carried out with MILC 2 ＋ 1 flavor gauge configurations at lattice spacing a ≈0.15 fm.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	傅子文		1	0	0.0	0.0