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arXiv 0907.1467hep-ph
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用QCD求和规则分析Y（4140）及相关分子态

Analysis of the Y(4140) and related molecular states with QCD sum rules

Zhi-Gang Wang, Zhi-Cheng Liu, Xiao-Hong Zhang

备注：
19 pages, 36 figures, slight revision
发表信息：
Eur.Phys.J.C64:373-386,2009
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摘要：

本文假设存在标量${D}^\ast {\bar {D}}^\ast$，${D}_s^\ast {\bar {D}}_s^\ast$，${B}^\ast {\bar {B}}^\ast$和${B}_s^\ast {\bar {B}}_s^\ast$分子态，并利用QCD求和规则研究了它们的质量.计算结果表明，Y（4140）不可能是纯量${D}_s^\ast {\bar {D}}_s^\ast$分子态，其质量约为$(250-500) \rm{MeV}$，高于相应的${D}^\ast -{\bar {D}}^\ast$、${D}_s^\ast -{\bar {D}}_s^\ast$、${B}^\ast -{\bar {B}}^\ast$和${B}_s^\ast -{\bar {B}}_s^\ast$阈值. $D^\ast {\bar D}^\ast$、$D_s^\ast {\bar D}_s^\ast$、$B^\ast {\bar B}^\ast$和$B_s^\ast {\bar B}_s^\ast$等标量分子态可能不存在，而${D'}^\ast {\bar {D'}}^\ast$、${D'}_s^\ast {\bar {D'}}_s^\ast$、${B'}^\ast {\bar {B'}}^\ast$和${B'}_s^\ast {\bar {B'}}_s^\ast$等标量分子态可能存在。

英文摘要：

In this article, we assume that there exist scalar ${D}^\ast {\bar {D}}^\ast$, ${D}_s^\ast {\bar {D}}_s^\ast$, ${B}^\ast {\bar {B}}^\ast$ and ${B}_s^\ast {\bar {B}}_s^\ast$ molecular states, and study their masses using the QCD sum rules. The numerical results indicate that the masses are about $(250-500) \rm{MeV}$ above the corresponding ${D}^\ast -{\bar {D}}^\ast$, ${D}_s^\ast -{\bar {D}}_s^\ast$, ${B}^\ast -{\bar {B}}^\ast$ and ${B}_s^\ast -{\bar {B}}_s^\ast$ thresholds, the Y(4140) is unlikely a scalar ${D}_s^\ast {\bar {D}}_s^\ast$ molecular state. The scalar $D^\ast {\bar D}^\ast$, $D_s^\ast {\bar D}_s^\ast$, $B^\ast {\bar B}^\ast$ and $B_s^\ast {\bar B}_s^\ast$ molecular states maybe not exist, while the scalar ${D'}^\ast {\bar {D'}}^\ast$, ${D'}_s^\ast {\bar {D'}}_s^\ast$, ${B'}^\ast {\bar {B'}}^\ast$ and ${B'}_s^\ast {\bar {B'}}_s^\ast$ molecular states maybe exist.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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