Near threshold heavy quarkonium photoproduction at large momentum transfer

被引:21
|
作者
Sun, Peng [1 ,2 ]
Tong, Xuan-Bo [3 ,4 ]
Yuan, Feng [5 ]
机构
[1] Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China
[2] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210023, Jiangsu, Peoples R China
[3] Chinese Univ Hong Kong, Sch Sci & Engn, Shenzhen 518172, Guangdong, Peoples R China
[4] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[5] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA
关键词
DISTRIBUTION AMPLITUDES; EXCLUSIVE PROCESSES; WAVE-FUNCTION; FORM-FACTORS; ASYMPTOTIC-BEHAVIOR; HIGHER TWIST; QCD ANALYSIS; NUCLEON; J/PSI; ELECTROPRODUCTION;
D O I
10.1103/PhysRevD.105.054032
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Perturbative QCD is applied to investigate the near threshold heavy quarkonium photoproduction at large momentum transfer. We take into account the contributions from the leading three-quark Fock states of the nucleon. The dominant contribution comes from the three-quark Fock state with one unit quark orbital angular momentum (OAM) whereas that from zero-quark OAM is suppressed at the threshold. From our analysis, we also show that there is no direct connection between the near threshold heavy quarkonium photoproduction and the gluonic gravitational form factors without additional approximation. Based on the comparison between our result and recent GlueX data of J/psi photoproduction, we make predictions for psi' and Upsilon (1S,2S) states which can be tested in future experiments.
引用
收藏
页数:14
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