Radiative transitions in charmonium from Nf=2 twisted mass lattice QCD

被引：33

作者：

Chen, Ying ^{[3
]}

Du, De-Chuan ^{[4
]}

Guo, Bao-Zhong ^{[4
]}

Li, Ning ^{[4
]}

Liu, Chuan ^{[1
,2
]}

Liu, Hang ^{[4
]}

Liu, Yu-Bin ^{[4
]}

Ma, Jian-Ping ^{[5
]}

Meng, Xiang-Fei ^{[6
]}

Niu, Zhi-Yuan ^{[4
]}

Zhang, Jian-Bo ^{[7
]}

机构：

[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[2] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[4] Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China

[5] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China

[6] Natl Supercomp Ctr, Tianjin 300457, Peoples R China

[7] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

来源：

PHYSICAL REVIEW D | 2011年 / 84卷 / 03期

基金：

美国国家科学基金会;

关键词：

PION FORM-FACTOR; FERMIONS;

D O I：

10.1103/PhysRevD.84.034503

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an exploratory study for charmonium radiative transitions: J/psi -> eta(c)gamma, chi(c0) -> J/Psi gamma, and h(c) -> eta(c)gamma using Nf = 2 twisted-mass lattice QCD gauge configurations. The single-quark vector form factors for eta(c) and chi(c0) are also determined. The simulation is performed at a lattice spacing of a = 0.067(2) fm and the lattice size is 32(3) x 64 with a pion mass of about 485 MeV. After extrapolation of lattice data at nonzero Q(2) to 0, we compare our results with previous quenched lattice results and the available experimental values.

引用

页数：12

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