I=2 ππ scattering from fully-dynamical mixed-action lattice QCD

被引：108

作者：

Beane, SR ^{[1
]}

Bedaque, PF

Orginos, K

Savage, MJ

机构：

[1] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

[2] Jefferson Lab, Newport News, VA 23606 USA

[3] Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA

[5] CALTECH, Pasadena, CA 91125 USA

[6] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW D | 2006年 / 73卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.73.054503

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We compute the I=2 pi pi scattering length at pion masses of m(pi)similar to 294, 348, and 484 MeV in fully-dynamical lattice QCD using Luscher's finite-volume method. The calculation is performed with domain-wall valence-quark propagators on asqtad-improved MILC configurations with staggered sea quarks at a single lattice spacing, b similar to 0.125 fm. Chiral perturbation theory is used to perform the extrapolation of the scattering length from lattice quark masses down to the physical value, and we find m(pi)a(2)=-0.0426 +/- 0.0006 +/- 0.0003 +/- 0.0018, in good agreement with experiment. The I=2 pi pi scattering phase shift is calculated to be delta=-43 +/- 10 +/- 5 degrees at vertical bar p vertical bar similar to 544 MeV for m(pi) similar to 484 MeV.

引用

页数：10

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