Revisiting the production of J /ψ + ηc via the e+ e- annihilation within the QCD light-cone sum rules

被引：4

作者：

Zeng, Long ^{[1
]}

Fu, Hai-Bing ^{[1
,4
]}

Hu, Dan-Dan ^{[1
]}

Chen, Ling-Li ^{[1
]}

Cheng, Wei ^{[2
,3
]}

Wu, Xing-Gang ^{[4
]}

机构：

[1] Guizhou Minzu Univ, Dept Phys, Guiyang 550025, Peoples R China

[2] Chinese Acad Sci, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China

[4] Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China

来源：

PHYSICAL REVIEW D | 2021年 / 103卷 / 05期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

QCD SUM-RULES; E(+)E(-) ANNIHILATION; DECAY; J/PSI;

D O I：

10.1103/PhysRevD.103.056012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We make a detailed study on the typical production channel of double charmoniums, e(+)e(-) -> J / psi + eta(c), at the center-of-mass collision energy root s = 10.58 GeV. The key component of the process is the form factor F (VP)(q(2)), which has been calculated within the QCD light-cone sum rules (LCSR). To improve the accuracy of the derived LCSR, we keep the J / psi light-cone distribution amplitude up to twist-4 accuracy. Total cross sections for e(+)e(-) -> J / psi + eta(c) at three typical factorization scales are sigma vertical bar(mu s) = 22.53(-3.49)(+3.46) fb, sigma vertical bar(mu k) = 21.98(-3.38)(+3.35)( )fb, and sigma vertical bar(mu 0) = 21.74(-3.33)(+3.29) fb, respectively. The factorization scale dependence is small, and those predictions are consistent with the BABAR and Belle measurements within errors.

引用

页数：9

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