论文标题
Tuju21：核PDF，带有Electroweak-Boson数据在NNLO
TUJU21: nuclear PDFs with electroweak-boson data at NNLO
论文作者
论文摘要
核部分分布函数（NPDF）可以在全球QCD分析中使用广泛的实验数据确定。除了较旧的固定目标深度非弹性散射和Drell-Yan（DY）DILEPTON生产数据外，LHC处P+PB碰撞的几项分析还提供了进一步的限制，并扩展了适用数据的运动范围。在这里，我们提供了以前的Tuju19分析的更新，现在我们还包括Atlas和CMS最近测量的Electroweak-Boson生产数据。 LHC数据首次包括在扰动QCD中在近距离领导顺序（NNLO）进行的NPDF分析中。和以前一样，我们的设置基于开源分析框架XFitter，我们适合自己的质子基线，确保完全一致的设置。我们发现与应用数据的良好一致性，并且与我们的NLO分析相比，在NNLO分析（0.84）的情况下，所产生的$χ^2/n _ {\ mathrm {df}} $明显小得多（0.94）。此外，我们介绍了我们的NNLO计算与来自ATLAS和CMS的PB+PB碰撞中的Electroweak-Boson生产数据之间的比较，以及最近通过CMS测量的DY数据，其中发现了NNLO校正显着。
Nuclear parton distribution functions (nPDFs) can be determined in a global QCD analysis using a wide range of experimental data. In addition to older fixed-target deep inelastic scattering and Drell-Yan (DY) dilepton production data, several analyses from p+Pb collisions at the LHC provide further constraints and extend the kinematic reach of applicable data. Here we present an update of our previous TUJU19 analysis where we now include also electroweak-boson production data recently measured by ATLAS and CMS. For the first time, LHC data are included in a nPDF analysis performed at next-to-next-to-leading order (NNLO) in perturbative QCD. As before, our setup is based on the open-source analysis framework xFitter and we fit our own proton baseline, ensuring a fully consistent setup. We find good agreement with the applied data and that the resulting $χ^2/N_{\mathrm{df}}$ is significantly smaller in case of the NNLO analysis (0.84) compared to our NLO analysis (0.94). Also, we present comparisons between our NNLO calculations and electroweak-boson production data in Pb+Pb collisions from ATLAS and CMS and DY data recently measured by CMS where NNLO corrections are found significant.
