The I=1 pion-pion scattering amplitude and timelike pion form factor from Nf=2+1 lattice QCD
The I=1 pion-pion scattering amplitude and timelike pion form factor from Nf=2+1 lattice QCD
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DOI：
10.1016/j.nuclphysb.2018.12.018
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发表时间：
2019-02-01
影响因子：
2.8
通讯作者：
Morningstar, Colin
中科院分区：
文献类型：
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作者：
Andersen, Christian;Bulava, John;Morningstar, Colin
用格点QCD和N-f = 2 + 1夸克动力学味计算了I = 1 p波π π弹性散射振幅和等矢类时π形状因子.威尔逊三叶草合奏产生的协调晶格模拟（CLS）的倡议，在四个晶格间距下降到a = 0.05 fm，几个π质量下降到m（π）= 200 MeV，和空间体积的范围L = 3.1-5.5 fm。这些合奏，这是公开的测量集，使调查的系统误差，由于有限的晶格间距和空间体积。的π π散射振幅是适合每个合奏的Breit-Wigner共振线型，而形状因子是更好地描述了三次减去色散关系比Gouncant-Sakurai参数化。(C)2018作者（S）由爱思唯尔公司出版
The elastic I = 1 p-wave pi pi scattering amplitude is calculated together with the isovector timelike pion form factor using lattice QCD with N-f = 2 + 1 dynamical quark flavors. Wilson clover ensembles generated by the Coordinated Lattice Simulations (CLS) initiative are employed at four lattice spacings down to a = 0.05 fm, several pion masses down to m(pi) = 200 MeV, and spatial volumes of extent L = 3.1-5.5 fm. The set of measurements on these ensembles, which is publicly available, enables an investigation of systematic errors due to the finite lattice spacing and spatial volume. The pi pi scattering amplitude is fit on each ensemble by a Breit-Wigner resonance lineshape, while the form factor is described better by a thrice-subtracted dispersion relation than the Gounaris-Sakurai parametrization. (C) 2018 The Author(s). Published by Elsevier B.V.