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arXiv 1201.6296hep-phhep-ex
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HERA的新F_L测量和偶极子模型

The New F_L Measurement from HERA and the Dipole Model

Carlo Ewerz, Andreas von Manteuffel, Otto Nachtmann, Andre Schoning

摘要:

从HERA对F_L的新测量中,我们导出了固定的Q ^2平均值<F_L/F_2>。我们比较这些边界是严格的标准偶极图片的框架。通过包括关于魅力结构函数F_2^(c)的信息来锐化边界。在实验误差范围内,数据遵守边界。但当3.5 GeV^2 <= Q^2 <= 20 GeV^2时,数据的中心值接近于界限,在某些情况下甚至高于界限。如果F_L/F_2的数据明显超出界限,则这些运动学点上的标准偶极图像将被排除。我们讨论,此外,如何尊重的界限,但接近他们的数据可以提供信息的问题,如颜色的透明度,饱和度和依赖性的偶极质子截面上的能量和偶极的大小。

英文摘要:

From the new measurement of F_L at HERA we derive fixed-Q^2 averages <F_L/F_2>. We compare these with bounds which are rigorous in the framework of the standard dipole picture. The bounds are sharpened by including information on the charm structure function F_2^(c). Within the experimental errors the bounds are respected by the data. But for 3.5 GeV^2 <= Q^2 <= 20 GeV^2 the central values of the data are close to and in some cases even above the bounds. Data on F_L/F_2 significantly exceeding the bounds would rule out the standard dipole picture at these kinematic points. We discuss, furthermore, how data respecting the bounds but coming close to them can give information on questions like colour transparency, saturation and the dependencies of the dipole-proton cross section on the energy and the dipole size.

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