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Hard scattering amplitude for the higher helicity components of the pion form factor
Cao, FG; Cao, J; Huang, T; Ma, BQ; Cao, FG , ACAD SINICA,INST THEORET PHYS,POB 2735,BEIJING 100080,PEOPLES R CHINA.
1997
发表期刊PHYSICAL REVIEW D
ISSN0556-2821
卷号55期号:11页码:7107-7113
摘要For obtaining the spin space wave function of the pion meson in the light-cone formalism from the naive quark model, it is necessary to take into account the Wigner rotation. Consequently there are higher helicity (lambda(1) + lambda(2) = +/- 1) components in the light-cone spin space wavefunction of pion in addition to the usual helicity (lambda(1) + lambda(2) = 0) components. For the pion electromagnetic form factor, we calculate the hard-scattering amplitude for the higher helicity components in light-cone perturbation theory. It is found that the hard-scattering amplitude for the higher helicity components is of order 1/Q(4), which is vanishingly small compared to that of the ordinary helicity components at very high Q(2) but should be considered in the Q(2) region where experimental data are available.
部门归属CCAST,WORLD LAB,BEIJING 100080,PEOPLES R CHINA; ACAD SINICA,INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA
关键词Light-cone Representation Perturbative Qcd Analysis Infinite-momentum Frame Exclusive Processes Wave-function Quantum Electrodynamics Sudakov Suppression Wigner Rotation Spin Chromodynamics
学科领域Physics
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收录类别SCI
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/12473
专题理论物理所SCI论文
通讯作者Cao, FG , ACAD SINICA,INST THEORET PHYS,POB 2735,BEIJING 100080,PEOPLES R CHINA.
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Cao, FG,Cao, J,Huang, T,et al. Hard scattering amplitude for the higher helicity components of the pion form factor[J]. PHYSICAL REVIEW D,1997,55(11):7107-7113.
APA Cao, FG,Cao, J,Huang, T,Ma, BQ,&Cao, FG , ACAD SINICA,INST THEORET PHYS,POB 2735,BEIJING 100080,PEOPLES R CHINA..(1997).Hard scattering amplitude for the higher helicity components of the pion form factor.PHYSICAL REVIEW D,55(11),7107-7113.
MLA Cao, FG,et al."Hard scattering amplitude for the higher helicity components of the pion form factor".PHYSICAL REVIEW D 55.11(1997):7107-7113.
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