$σ^{γP}$随相干长度的演化
The evolution of $σ^{γP}$ with coherence length
摘要:
假设对于虚光子质子散射截面的行为,在固定的$Q^2$处的形式为$σ^{γP} \propto l^{λ_{\rm eff}}$,其中$l$是光子波动的相干长度,可以看出,对于不同的$Q^2$,$σ^{γP}$的外推值对于$l\approx 10^8$ ~fm交叉。有人认为,这种行为是不是物理的,和行为的横截面必须改变之前,这个相干长度$l$达到。这可以设定部分子密度饱和开始的尺度。
英文摘要:
Assuming the form $σ^{γP} \propto l^{λ_{\rm eff}}$ at fixed $Q^2$ for the behavior of the virtual-photon proton scattering cross section, where $l$ is the coherence length of the photon fluctuations, it is seen that the extrapolated values of $σ^{γP}$ for different $Q^2$ cross for $l\approx 10^8$~fm. It is argued that this behavior is not physical, and that the behavior of the cross sections must change before this coherence length $l$ is reached. This could set the scale for the onset of saturation of parton densities.
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