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arXiv 1609.07968hep-ph
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CTEQ-TEA部分子分布函数和HERA运行I和II组合数据

CTEQ-TEA parton distribution functions and HERA Run I and II combined data

Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Marco Guzzi, Joey Huston, Pavel Nadolsky, Jon Pumplin, Carl Schmidt, Daniel Stump, C. -P. Yuan

摘要:

我们分析了最近HERA运行I+II组合的包含深非弹性散射截面数据对CT14全球PDF分析的影响。NLO和NNLO处的新PDF(称为CT 14 $_{\textrm{HERA2}}$)通过CT 14数据集合的重新拟合获得,其中HERA运行I组合测量值被新HERA运行I+II组合替换。PDF的CT 14函数参数化足够灵活,可以很好地描述不同的味道组合,所以我们使用相同的参数化CT 14 $_{\textrm{HERA2}}$,但有一个额外的形状参数来描述奇怪的夸克PDF。我们发现HERA I+II数据可以相当好地拟合,并且CT 14和CT 14 $_{\textrm{HERA2}}$ PDF都可以同样好地描述我们的全球分析中包含的非HERA数据。由于CT 14和CT 14 $_{\textrm{HERA2}}$ PDF在PDF误差范围内一致,因此我们继续推荐CT 14 PDF用于LHC运行2实验的分析。

英文摘要:

We analyze the impact of the recent HERA run I+II combination of inclusive deep inelastic scattering cross-section data on the CT14 global analysis of PDFs. New PDFs at NLO and NNLO, called CT14$_{\textrm{HERA2}}$, are obtained by a refit of the CT14 data ensembles, in which the HERA run I combined measurements are replaced by the new HERA run I+II combination. The CT14 functional parametrization of PDFs is flexible enough to allow good descriptions of different flavor combinations, so we use the same parametrization for CT14$_{\textrm{HERA2}}$ but with an additional shape parameter for describing the strange quark PDF. We find that the HERA I+II data can be fit reasonably well, and both CT14 and CT14$_{\textrm{HERA2}}$ PDFs can describe equally well the non-HERA data included in our global analysis. Because the CT14 and CT14$_{\textrm{HERA2}}$ PDFs agree well within the PDF errors, we continue to recommend CT14 PDFs for the analysis of LHC Run 2 experiments.

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