arXiv 0712.04292007-12-04hep-ph

重介子与$ρ$介子QCD相互作用的系统研究

Systematic Study on QCD Interactions of Heavy Mesons with $ρ$ Meson

Zuo-Hong Li, Wei Liu, Hai-Yan Liu

备注：: 16 pages, 1 eps figure, version to appear in PLB
发表信息：: Phys.Lett.B659:598-606,2008
DOI：: 10.1016/j.physletb.2007.11.074

摘要：

负宇称重介子与$ρ$介子的强相互作用可以用一个在同位旋SU（2）变换下不变的有效拉格朗日量一致地描述。四个耦合常数$g_{HHρ}$、$f_{H^*Hρ}$、$g_{H^*H^*ρ}$和$f_{H^*H^*ρ}$进入有效拉格朗日量，其中$H$ $(H^*)$表示赝标底介子或粲介子（对应的矢量介子）。利用QCD光锥求和规则（LCSR）方法，以最近更新的强子参数为输入，给出了$g_{H^*H^*ρ}$和$f_{H^*H^*ρ}$的一个估计，并对$g_{HHρ}$和$f_{H^*Hρ}$给出了一个改进的结果.此外，我们研究了这些非微扰量的重夸克渐近行为，并评估了相应的有效手征拉格朗日量的两个低能参数$β$和$λ$。

英文摘要：

The strong interactions of the negative-parity heavy mesons with $ρ$ meson may be described consistently in the context of an effective lagrangian, which is invariant under isospin SU(2) transformation. Four coupling constants $g_{HHρ}$, $f_{H^*Hρ}$, $g_{H^*H^*ρ}$ and $f_{H^*H^*ρ}$ enter the effective lagrangian, where $H$ $(H^*)$ denotes a pseudoscalar bottom or charm meson (the corresponding vector meson). Using QCD light cone sum rule (LCSR) method and, as inputs, the hadronic parameters updated recently, we give an estimate of $g_{H^*H^*ρ}$ and $f_{H^*H^*ρ}$, about which little was known before, and present an improved result for $g_{HHρ}$ and $f_{H^*Hρ}$. Also, we examine the heavy quark asymptotic behavior of these nonperturbative quantities and assess the two low energy parameters $β$ and $λ$ of the corresponding effective chiral lagrangian.

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英文摘要：

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