arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新，休息一下吧，周末愉快~~
arXiv 0804.4817hep-ph
收藏

$J^{PC}=1^{--}$粲偶素$Y$介子的QCD求和规则研究

QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$ mesons

R. M. Albuquerque, M. Nielsen

备注：
10 pages, 9 figures
发表信息：
Nucl.Phys.A815:53-66,2009; Erratum-ibid.A857:48-49,2011
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们用QCD求和规则检验了最近观测到的介子Y（4260），Y（4350）和Y（4660）的性质，假设它们是奇异的四夸克态$(c\bar{c}q\bar{q})$或具有$J^{PC}=1^{--}$的$(c\bar{c}s\bar{s})$.在$α_s$中，我们在首阶下工作，考虑了高维凝聚的贡献，并保留了奇异夸克质量$m_s$中的线性项。对于$(c\bar{c}s\bar{s})$态，我们发现一个质量$m_Y=(4.65\pm 0.10)$ GeV，它与实验候选者Y（4660）相容，而对于$(c\bar{c}q\bar{q})$态，我们发现一个质量$m_Y=(4.49\pm 0.11)$ GeV，它比实验候选者Y（4350）的质量更高。用我们正在研究的四夸克结构，我们不能把Y（4260）解释为四夸克态。我们还考虑分子$D_{s0}\bar{D}_s^*$和$D_{0}\bar{D}^*$状态。对于$D_{s0}\bar{D}_s^*$分子态，我们得到$m_{D_{s0}\bar{D}_s^*}=(4.42\pm 0.10)$ GeV，考虑到误差，它与介子Y的质量（4350）是一致的，对于$D_{0}\bar{D}^*$分子态，我们得到$m_{D_{0}\bar{D}^*}=(4.27\pm 0.10)$ GeV与介子Y的质量（4260）非常一致。

英文摘要：

We use QCD sum rules to test the nature of the recently observed mesons Y(4260), Y(4350) and Y(4660), assumed to be exotic four-quark $(c\bar{c}q\bar{q})$ or $(c\bar{c}s\bar{s})$ states with $J^{PC}=1^{--}$. We work at leading order in $α_s$, consider the contributions of higher dimension condensates and keep terms which are linear in the strange quark mass $m_s$. We find for the $(c\bar{c}s\bar{s})$ state a mass $m_Y=(4.65\pm 0.10)$ GeV which is compatible with the experimental candidate Y(4660), while for the $(c\bar{c}q\bar{q})$ state we find a mass $m_Y=(4.49\pm 0.11)$ GeV, which is higger than the mass of the experimental candidate Y(4350). With the tetraquark structure we are working we can not explain the Y(4260) as a tetraquark state. We also consider molecular $D_{s0}\bar{D}_s^*$ and $D_{0}\bar{D}^*$ states. For the $D_{s0}\bar{D}_s^*$ molecular state we get $m_{D_{s0}\bar{D}_s^*}=(4.42\pm 0.10)$ GeV which is consistent, considering the errors, with the mass of the meson Y(4350) and for the $D_{0}\bar{D}^*$ molecular state we get $m_{D_{0}\bar{D}^*}=(4.27\pm 0.10)$ GeV in excelent agreement with the mass of the meson Y(4260).

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。

↑