New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC

New CTEQ global analysis of quantum chromodynamics with high-precision data from the LHC
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利用 LHC 的高精度数据对量子色动力学进行新的 CTEQ 全局分析

DOI:
10.1103/physrevd.103.014013
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发表时间:
2019-12
期刊:
Phys. Rev. D (editor's suggestion)
影响因子:
--
通讯作者:
Yuan C-P
Yuan C-P
中科院分区:
其他
文献类型:
--
作者:
Hou Tie-Jiun;Gao Jun;Hobbs T. J.;Xie Keping;Dulat Sayipjamal;Guzzi Marco;Huston Joey;Nadolsky Pavel;Pumplin Jon;Schmidt Carl;Sitiwaldi Ibrahim;Stump Daniel;Yuan C-P

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我们给出了CTEQ-TEA合作的新的部分子分布函数(PDF),它使用了各种高精度的大型强子对撞机(LHC)数据,以及组合的HERA I+II深非弹性散射数据集,以及CT14全球QCD分析中存在的数据集。新的大型强子对撞机测量包括具有完全快度覆盖的单包含喷流产生,以及Drell-yan对、顶夸克对和高$p_T$$Z$玻色子的产生,以实现对PDF的最大灵敏度。在NLO和NNLO确定部分子分布,其中每个PDF伴随着使用Hessian方法确定的误差集。基于海森表示和拉格朗日乘子方法的快速PDF调查技术被用来量化每个数据集对诸如$\α_S(M_Z)$、胶子和奇异夸克分布等量的偏好。我们将主要生成的PDF集指定为CT18。ATLAS 7 TeV精度$W/Z$数据不包括在CT18中,因为它们与全球FIT中的其他数据集存在紧张关系。生成的备用PDF集包括ATLAS Precision 7 TeV$W/Z$Data(CT18A)、用于低$x$DIS数据的新比例选择(CT18X)或以上所有选项,并为魅力质量(CT18Z)提供略高的选择。给出了大型强子对撞机的标准蜡烛截面(如聚变希格斯玻色子截面)的理论计算。
We present the new parton distribution functions (PDFs) from the CTEQ-TEA collaboration, obtained using a wide variety of high-precision Large Hadron Collider (LHC) data, in addition to the combined HERA I+II deep-inelastic scattering data set, along with the data sets present in the CT14 global QCD analysis. New LHC measurements in single-inclusive jet production with the full rapidity coverage, as well as production of Drell-Yan pairs, top-quark pairs, and high-$p_T$ $Z$ bosons, are included to achieve the greatest sensitivity to the PDFs. The parton distributions are determined at NLO and NNLO, with each of these PDFs accompanied by error sets determined using the Hessian method. Fast PDF survey techniques, based on the Hessian representation and the Lagrange Multiplier method, are used to quantify the preference of each data set to quantities such as $\alpha_s(m_Z)$, and the gluon and strange quark distributions. We designate the main resulting PDF set as CT18. The ATLAS 7 TeV precision $W/Z$ data are not included in CT18, due to their tension with other data sets in the global fit. Alternate PDF sets are generated including the ATLAS precision 7 TeV $W/Z$ data (CT18A), a new scale choice for low-$x$ DIS data (CT18X), or all of the above with a slightly higher choice for the charm mass (CT18Z). Theoretical calculations of standard candle cross sections at the LHC (such as the $gg$ fusion Higgs boson cross section) are presented.
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