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arXiv 1709.08347hep-phhep-ex
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EPPS16核PDF

The EPPS16 nuclear PDFs

Kari J. Eskola, Petja Paakkinen, Hannu Paukkunen, Carlos A. Salgado

摘要:

我们报告EPPS 16-第一次分析的非线性光学核PDF LHC p-Pb数据(Z,W,dijets)已直接用作约束。与我们以前的拟合EPS 09相比,现在还包括中微子-核深度非弹性散射和π-核Drell-Yan过程的数据。许多理论框架也从EPS 09更新,包括在深度非弹性散射中对重夸克的一致处理。然而,最值得注意的变化是,我们不再假设价和海夸克的味盲核修改。这大大降低了理论偏差。所有的分析数据都得到了很好的再现,从而支持了共线因式分解在高能重核碰撞中的有效性。然而,就口味而言,不确定性仍然相当大。

英文摘要:

We report on EPPS16 - the first analysis of NLO nuclear PDFs where LHC p-Pb data (Z, W, dijets) have been directly used as a constraint. In comparison to our previous fit EPS09, also data from neutrino-nucleus deeply-inelastic scattering and pion-nucleus Drell-Yan process are now included. Much of the theory framework has also been updated from EPS09, including a consistent treatment of heavy quarks in deeply-inelastic scattering. However, the most notable change is that we no longer assume flavour-blind nuclear modifications for valence and sea quarks. This significantly reduces the theoretical bias. All the analysed data are well reproduced and the analysis thereby supports the validity of collinear factorization in high-energy collisions involving heavy nuclei. However, flavour by flavour, the uncertainties are still rather large.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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