Understanding the cross section of e+e- → ηJ/ψ process via nonrelativistic QCD

被引：12
作者：
Qiao, Cong-Feng [1 ,2 ]
Zhu, Rui-Lin [1 ,3 ]
机构：
[1] Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
[2] USTC, Collaborat Innovat Ctr Particles & Interact, Hefei 230026, Peoples R China
[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW D | 2014年 / 89卷 / 07期
基金：
中国国家自然科学基金;
关键词：
MIXING ANGLE; ANNIHILATION;
D O I：
10.1103/PhysRevD.89.074006
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Motivated by the large cross section of the e(+)e(-) -> eta J / psi process measured by the BESIII and Belle Collaborations recently, we evaluate this process at Omicron alpha(4)(s) _ accuracy in the framework of nonrelativistic QCD. We find that the cross section at the center-of-mass energy root s = 4.009 GeV is 34.6 pb, which is consistent with the BESIII data. The comparison with the Belle data in the region from 4.0 to 5.3 GeV is also presented. Concerning the eta and eta' mixing and the potential gluonium component of eta', we also estimate the rate of the e(+)e(-) -> eta J / psi process, which can be checked within the updated Belle data.
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页数：7
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