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COUNTING RULES, HOLOGRAPHIC WAVE FUNCTIONS, MEROMORPHIZATION AND QUARK-HADRON DUALITY

机译:计数规则,全息波函数,亚芳光和夸克 - 强子二元性

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We start with study of the meson form factor FM{Q2) constructed using recently proposed holographic light-front wave functions. We find that its asymptotic behavior is generated by soft Feynman mechanism rather than by short distance dynamics. This causes a very late onset of the 1/Q2 asymptotic behavior at unaccessible momenta Q2 > 10 GeV2 We show that this model can be also obtained within the Migdal's "meromorphization" approach if one applies it to 3-point function for scalar currents made of scalar quarks. For spin-1/2 quarks, we demonstrated that resulting form factor F^lnot (Q2) has 1/Q4 asymptotic behavior, but owing to late onset of this asymptotic pattern, F^inol(Q2) imitates the 1/Q2 behavior in the few GeV2 region. In the meromorphization approach, just like in the local quark-hadron duality model for the pion form factor, adding the O(as) correction to the spectral function brings in the hard pQCD contribution that has the dimensional counting 1/Q2 behavior at large Q2. At accessible Q2, the O(as) term is a rather small fraction of the total result. In this scenario, both hard and soft contributions are present, and the "observed" quark counting rules for hadronic form factors is an approximate and transitional phenomenon resulting from long-distance dynamics, Feynman mechanism in its preasymptotic regime.
机译:我们从最近提出的全息光前波函数开始研究Meson Form Fm {Q2)。我们发现它的渐近行为是由软Feynman机制而不是短距离动态产生的。这导致1 / Q2渐近行为在不可进入的动脉Q2> 10 GEV2处导致了1 / Q2渐近行为的初步开始,我们表明该模型也可以在MIGDAL的“ermorphization”方法中,如果将其应用于由标量电流制成的三点函数标量夸克。对于Spin-1/2夸克,我们证明了所得形式因子F ^ lnot(Q2)具有1 / Q4渐近行为,但由于这种渐近模式的后期开始,F ^ inol(Q2)模仿1 / Q2行为少数Gev2区域。在ermorphization方法中,就像在沟形状因子的本地夸克 - 波多龙二元模型中一样,将O(AS)校正添加到光谱函数中的硬质PQCD贡献,其在大Q2中具有尺寸计数1 / Q2行为。在Accessible Q2,O(AS)术语是总结果的相当小的一部分。在这种情况下,存在艰难和软贡献,并且“观察到”夸克夸克的夸克形状因子规则是由于长途动力学,Feynman机制在其缺乏政权中产生的近似和过渡现象。

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