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arXiv 1502.07108hep-phhep-ex
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低x时的部分子分布与胶子和夸克平均多重数

Parton distributions at low x and gluon- and quark average multiplicities

Anatoly Kotikov

摘要:

我们给出了基于对角化的低x下部分子密度和碎裂函数的Q2演化的一般方法。对角化导致Q2演化中的两个分量,每个分量都包含一个非微扰参数。参数的值可以通过拟合深度非弹性散射结构函数F2和平均射流多重性的实验数据来找到。其中一个分量包含了所有的大值ln(1/x),并在小x区域产生基本贡献。第二个在低x下是规则的,但它的贡献对于与实验数据有很好的一致性是非常重要的

英文摘要:

We shown the general approach for Q2 evolution of parton densities and fragmentation functions at low x based on the diagonalization. The diagonalization leads to the two components in the Q2 evolution, each of which contains a nonperturbative parameter. The values of the parameters can be found by fits of the experimental data for the deep-inelastic scattering structure function F2 and for average jet multiplicities. One of the components contains the all large logarithms ln(1/x) and produce the basic contribution at small x region. The second one is regular at low x but its contribution is very important to have a good agreement with experimental data

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