On the Couplings of Vector Mesons in AdS/QCD
On the Couplings of Vector Mesons in AdS/QCD
复制标题
AdS/QCD 中矢量介子的耦合
DOI：
10.1088/1126-6708/2006/04/003
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发表时间：
2004
影响因子：
5.4
通讯作者：
M. Strassler
中科院分区：
文献类型：
--
作者：
Sungho Hong;Sukjin Yoon;M. Strassler
在ADS/CFT的背景下，我们讨论了ρ介子与其他强子耦合的普遍性问题。通过对一些模型的探索，我们发现一般的ρ占优预测ρgρHH=mρ2不成立，gρHH不是独立于强子H的。然而，我们证明了，在ADS/QCD背景下的任何模型中，gρHH以及所有激发的矢量介子的耦合都有两个极限区域变得与H无关：(1)当H是由一个大维度的算符产生时；(2)当H是一个高激发的强子时。我们还找到了一个特定模型的扇区，其中ρ耦合的普适性是精确的。然而，在这些情况下，fρgρ=mρ2都不一定是真的，尽管我们从经验上发现，在我们所研究的模型中，这种关系确实大致成立(直到二阶因子)。
We address, in the AdS/CFT context, the issue of the universality of the couplings of the ρ meson to other hadrons. Exploring some models, we find that generically the ρ-dominance prediction fρgρHH = mρ2 does not hold, and that gρHH is not independent of the hadron H. However, we prove that, in any model within the AdS/QCD context, there are two limiting regimes where the gρHH, along with the couplings of all excited vector mesons as well, become H-independent: (1) when H is created by an operator of large dimension, and (2) when H is a highly-excited hadron. We also find a sector of a particular model where universality for the ρ coupling is exact. Still, in none of these cases need it be true that fρgρ = mρ2, although we find empirically that the relation does hold approximately (up to a factor of order two) within the models we have studied.