Y(2175) state in the QCD sum rule

被引：72

作者：

Chen, Hua-Xing ^{[1
,2
]}

Liu, Xiang ^{[1
]}

Hosaka, Atsushi ^{[2
]}

Zhu, Shi-Lin ^{[1
]}

机构：

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

[2] Osaka Univ, Res Ctr Nucl Phys, Ibaraki 5670047, Japan

来源：

PHYSICAL REVIEW D | 2008年 / 78卷 / 03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：

D O I：

10.1103/PhysRevD.78.034012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the mass of the state Y(2175) of J(PC)=1(--) in the QCD sum rule. We construct both the diquark-antidiquark currents (ss)((s) over bar(s) over bar) and the meson-meson currents ((s) over bars)((s) over bars). We find that there are two independent currents for both cases and derive the relations between them. The operator product expansion convergence of these two currents is sufficiently fast, which enables us to perform good sum rule analysis. Both the SVZ (Shifman-Vainshtein-Zakharov) sum rule and the finite energy sum rule lead to a mass around 2.3 +/- 0.4 GeV, which is consistent with the observed mass within the uncertainties of the present QCD sum rule. The coupling of the four-quark currents to lower lying states such as phi(1020) turns out to be rather small. We also discuss possible decay properties of Y(2175) if it is a tetraquark state.

引用

页数：8

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