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arXiv 2008.05233hep-phnucl-th
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次主导阶的偶极子模型符合HERA数据

Dipole model at Next-to-Leading Order meets HERA data

G. Beuf, H. Hänninen, T. Lappi, H. Mäntysaari

摘要:

HERA实验测量的小x深度非弹性散射(DIS)总截面数据,在首阶偶极图像中用Balitsky-Kovchegov(BK)演化很好地描述了.最近,完整的次主导阶(NLO)偶极图像总截面已成为DIS可用,并已设计出一个工作的因式分解方案,减去软胶子发散目前在NLO。我们报告我们最近发表的工作中,我们做的第一个比较的NLO DIS总截面HERA数据。通过拟合HERA约化截面数据,确定了BK演化的非微扰初始条件。由于DIS总截面的非线性光学结果目前仅在无质量夸克极限下可用,因此我们还拟合了一个仅含轻夸克的截面,该截面是用已发表的总夸克和重夸克数据参数化构造的。我们发现一个很好的描述HERA数据。由于完整的非线性光学BK方程是计算昂贵的,我们使用了一些超越LO处方的演变,其中包括最重要的高阶校正增强大的横动量,包括最近版本的方程制定的目标动量分数。

英文摘要:

Deep inelastic scattering (DIS) total cross section data at small-x as measured by the HERA experiments is well described by Balitsky-Kovchegov (BK) evolution in the leading order dipole picture. Recently the full Next-to-Leading Order (NLO) dipole picture total cross sections have become available for DIS, and a working factorization scheme has been devised which subtracts the soft gluon divergence present at NLO. We report our recently published work in which we make the first comparisons of the NLO DIS total cross sections to HERA data. The non-perturbative initial condition to BK evolution is fixed by fitting the HERA reduced cross section data. As the NLO results for the DIS total cross section are currently available only in the massless quark limit, we also fit a light-quark-only cross section constructed with a parametrization of published total and heavy quark data. We find an excellent description of the HERA data. Since the full NLO BK equation is computationally expensive, we use a number of beyond LO prescriptions for the evolution that include most important higher order corrections enhanced by large transverse logarithms, including the recent version of the equation formulated in terms of the target momentum fraction.

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