Timelike pion form factor in lattice QCD

被引：69
|
作者：
Feng, Xu [1 ,2 ]
Aoki, Sinya [3 ]
Hashimoto, Shoji [1 ,4 ]
Kaneko, Takashi [1 ,4 ]
机构：
[1] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
[2] Columbia Univ, Dept Phys, New York, NY 10027 USA
[3] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan
[4] Grad Univ Adv Studies Sokendai, Sch High Energy Accelerator Sci, Tsukuba, Ibaraki 3050801, Japan
来源：
PHYSICAL REVIEW D | 2015年 / 91卷 / 05期
关键词：
PHYSICS; MATRIX; DECAYS; STATES;
D O I：
10.1103/PhysRevD.91.054504
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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(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.
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收藏
页数：16
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