Precise determination of the I=2 ππ scattering length from mixed-action lattice QCD

被引：94
作者：
Beane, Silas R. [1 ]
Luu, Thomas C. [2 ]
Orginos, Kostas [3 ,4 ]
Parreno, Assumpta [5 ,6 ]
Savage, Martin J. [7 ]
Torok, Aaron [1 ]
Walker-Loud, Andre [8 ]
机构：
[1] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA
[2] Lawrence Livermore Natl Lab, N Div, Livermore, CA 94551 USA
[3] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA
[4] Jefferson Lab, Newport News, VA 23606 USA
[5] Univ Barcelona, Dept Estructura & Constituents Mat, E-08028 Barcelona, Spain
[6] Univ Barcelona, Inst Ciencies Cosmos, E-08028 Barcelona, Spain
[7] Univ Washington, Dept Phys, Seattle, WA 98195 USA
[8] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
来源：
PHYSICAL REVIEW D | 2008年 / 77卷 / 01期
关键词：
D O I：
10.1103/PhysRevD.77.014505
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The I = 2 pi pi scattering length is calculated in fully dynamical lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations (with fourth-rooted staggered sea quarks) at four light-quark masses. Two- and three-flavor mixed-action chiral perturbation theory at next-to-leading order is used to perform the chiral and continuum extrapolations. At the physical charged pion mass, we find m(pi)a(pi pi)(I=2) = -0.043 30 +/- 0.000 42, where the error bar combines the statistical and systematic uncertainties in quadrature.
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页数：12
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