Update of Parton Distributions at NNLO
Update of Parton Distributions at NNLO
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DOI：
10.1016/j.physletb.2007.07.040
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发表时间：
2007-06
影响因子：
4.4
通讯作者：
Alan D. Martin;W. Stirling;R. Thorne;G. Watt
中科院分区：
文献类型：
--
作者：
Alan D. Martin;W. Stirling;R. Thorne;G. Watt
我们提出了一套新的部分子分布在NNLO。由于理论处理的改进，这些与NNLO以前可用的数据集不同。特别是，我们包括一个完整的治疗重口味的区域附近的夸克质量。通过这种方式，首次提出了一组基本完整的NNLO部分子。改进后的处理使胶子和重夸克的分布发生了显著变化，在NNLO处QCD耦合系数αS（MZ 2）=0.1191±0.002（expt.）±0.003（理论值）。间接地，这也导致了在小x处轻部分子的变化，并修改了我们对LHC产生W和Z的预测。以及最适合的一套部分子，我们还提供了30个额外的集合，代表使用海森方法获得的部分子的不确定性。
We present a new set of parton distributions obtained at NNLO. These differ from the previous sets available at NNLO due to improvements in the theoretical treatment. In particular we include a full treatment of heavy flavours in the region near the quark mass. In this way, an essentially complete set of NNLO partons is presented for the first time. The improved treatment leads to a significant change in the gluon and heavy quark distributions, and a larger value of the QCD coupling at NNLO, αS(MZ2)=0.1191±0.002(expt.)±0.003(theory). Indirectly this also leads to a change in the light partons at small x and modifications of our predictions for W and Z production at the LHC. As well as the best-fit set of partons, we also provide 30 additional sets representing the uncertainties of the partons obtained using the Hessian approach.