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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 F_(M)(Q~(2)) constructed using recentlyproposed 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/Q~(2) asymptotic behavior at unaccessible momenta Q~(2) approx.> 10 GeV~(2). 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_(M)~(spinor)(Q~(2)) has 1/Q~(4) asymptotic behavior, but owing to late onset of this asymptotic pattern, F_(M)~(spinor)(Q~(2)) imitates the 1/Q~(2) behavior in the few GeV~(2) region. In the meromorphization approach, just like in the local quark-hadron duality model for the pion form factor, adding the O((alpha)_(s)) correction to the spectral function brings in the hard pQCD contribution that has the dimensional counting 1/Q~(2) behavior at large Q~(2). At accessible Q~(2), the O((alpha)_(s)) 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:我们从研究使用最近的全息光前波函数构建的Meson形式因子F_(Q〜(2))的研究开始。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 / Q〜(2)渐近行为的非常晚期在不可进入的动态Q〜(2)约。> 10 GEV〜(2)。我们表明,如果将其应用于由标量夸克制成的标量电流应用于3点函数,则可以在MIGDAL的“ermorphization”方法中获得该模型。对于Spin-1/2夸克,我们证明了所得形状因子F_(m)〜(纯纯)(q〜(2))具有1 / q〜(4)渐近行为,但由于这种渐近模式的后期开始, f_(m)〜(旋转)(q〜(2))模仿少数GEV〜(2)区域中的1 / Q〜(2)行为。在meromorphization方法,就像在为π介子形状因子本地夸克强子对偶模型,加入O((阿尔法)_(S))更正的光谱功能带来在具有三维计数硬微扰QCD贡献1 / q〜(2)大q〜(2)的行为。在Accessible Q〜(2)中,O((alpha)_(s))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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