ηc Production at LHC and Implications for the Understanding of J/ψ Production

被引：77

作者：

Han, Hao ^{[1
,2
]}

Ma, Yan-Qing ^{[3
,4
]}

Meng, Ce ^{[1
,2
]}

Shao, Hua-Sheng ^{[1
,2
,5
]}

Chao, Kuang-Ta ^{[1
,2
,4
,6
]}

机构：

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

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Univ Maryland, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA

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

[5] CERN, Dept Phys, Theory Unit, Beijing 100871, Peoples R China

[6] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 09期

基金：

中国国家自然科学基金;

关键词：

PP COLLISIONS;

D O I：

10.1103/PhysRevLett.114.092005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a complete evaluation for the prompt eta(c) production at the LHC at next-to-leading order in alpha(s) in nonrelativistic QCD. By assuming heavy-quark spin symmetry, the recently observed eta(c) production data by LHCb results in a very strong constraint on the upper bound of the color-octet long-distance matrix element < O-J/psi(S-1(0)[8])> of J/psi. We find this upper bound is consistent with our previous study of the J/psi yield and polarization and can give good descriptions for the measurements, but the upper bound is inconsistent with some other theoretical estimates. This may provide important information for understanding the nonrelativistic QCD factorization formalism.

引用

页数：5

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