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arXiv 1712.01736hep-phhep-ex
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考虑核子中海夸克不对称性确定断裂函数的整体分析

Global analysis on determination of fracture functions considering sea quark asymmetries in the nucleon

Samira Shoeibi, F. Taghavi-Shahri, Kurosh Javidan

摘要:

在HERA电子-质子($ep$)对撞机上进行的几次实验收集了携带大部分质子能量的领先质子和领先中子的光谱的高精度数据。本文在微扰QCD(pQCD)框架下分析了HERA深度非弹性散射(DIS)过程中前导核子产生的最新实验数据。基于断裂函数框架的方法已经被使用,并且核子断裂函数(核子FF)${\cal M}_2^{(n/p)} (x, Q^2, x_L)$已经从由HERA的ZEUS合作测量的DIS数据的全球QCD分析中被提取。我们表明,断裂函数formalisem的方法允许我们唯象参数化的核子FF在输入规模,$Q_0^2$。考虑到在DIS过程中领先的核子生产数据,我们提出了单独的部分子分布的所有部分子物种的结果。从$t$积分的先导重子断裂函数$F_2^{\rm LB(3)} (x, Q^2, x_L)$中提取的结果与所分析的DIS数据在很宽的纵向动量分数$x_L$和标度分数动量变量$x$范围内符合得很好。

英文摘要:

Several experiments at the electron-proton ($ep$) collider HERA have collected high precision data on the spectrum of leading-proton and leading-neutron carrying a large fraction of the proton's energy. In this paper, we have analyzed recent experimental data on the production of leading-nucleon in deep inelastic scattering (DIS) processes at HERA in the framework of a perturbative QCD (pQCD). An approach based on the fractures functions framework has been used, and the nucleon fracture functions (nucleon FFs) ${\cal M}_2^{(n/p)} (x, Q^2, x_L)$ have been extracted from global QCD analysis of DIS data measured by ZEUS collaboration at HERA. We show that the approach of fracture functions formalisem allows us phenomenologically parametrize the nucleon FFs at the input scale, $Q_0^2$. Considering leading-nucleon production data in the DIS processes, we present the results for the separate parton distributions for all parton species. The extracted results from the $t$-integrated leading-baryon fracture functions, $F_2^{\rm LB(3)} (x, Q^2, x_L)$ are in good agreement with all DIS data analyzed, for a wide range of longitudinal momentum fraction $x_L$ as well as scaled fractional momentum variable $x$.

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