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arXiv 0808.0182hep-ph
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高能散射中核子颜色涨落的证据

Evidence for color fluctuations in the nucleon in high-energy scattering

L. Frankfurt, M. Strikman, D. Treleani, C. Weiss

摘要:

我们将硬过程的QCD分解与软衍射中的截面涨落概念相结合,研究了核子部分子密度的量子涨落。小-x胶子密度的涨落与e-p散射中非弹性和弹性矢量介子产生的比值有关。一个简单的动力学模型解释了HERA的数据,并预测了该比值的x和Q^2依赖性。在p-p/pbar-p散射中,波动增强了多个硬过程(但不能解释Tevatron CDF数据),并减少了中心排他性衍射中的间隙存活。

英文摘要:

We study quantum fluctuations of the nucleon's parton densities by combining QCD factorization for hard processes with the notion of cross section fluctuations in soft diffraction. The fluctuations of the small-x gluon density are related to the ratio of inelastic and elastic vector meson production in e-p scattering. A simple dynamical model explains the HERA data and predicts the x- and Q^2-dependence of the ratio. In p-p/pbar-p scattering, fluctuations enhance multiple hard processes (but cannot explain the Tevatron CDF data), and reduce gap survival in central exclusive diffraction.

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