Timelike pion form factor in lattice QCD
Timelike pion form factor in lattice QCD
复制标题
DOI：
10.1103/physrevd.91.054504
复制
发表时间：
2014-12
影响因子：
5
通讯作者：
Xu Feng;S. Aoki;S. Hashimoto;T. Kaneko
中科院分区：
文献类型：
--
作者：
Xu Feng;S. Aoki;S. Hashimoto;T. Kaneko
我们使用有限体积法对类时动量区中π介子形状因子的复相位和模进行了非微扰晶格计算。我们使用了两个2 +1$-味重叠费米子的系综，介子质量为${m}_{\ensuremath{\pi}}=380$和290 MeV。通过计算质心系和三个运动标架中I=1的形状因子，得到了矢量共振时类时动量转移的十个不同值的形状因子。我们比较的结果与现象学模型的Gouns-Sakurai及其变种。
We perform a nonperturbative lattice calculation of the complex phase and modulus of the pion form factor in the timelike momentum region using the finite-volume technique. We use two ensembles of $2+1$-flavor overlap fermions at pion masses ${m}_{\ensuremath{\pi}}=380$ and 290 MeV. By calculating the $I=1$ correlators in the center-of-mass and three moving frames, we obtain the form factor at ten different values of the timelike momentum transfer around the vector resonance. We compare the results with the phenomenological model of Gounaris-Sakurai and its variant.