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

By T. Hou, Jun Gao, T. Hobbs, K. Xie, S. Dulat, Marco Guzzi, J. Huston, Pavel M. Nadolsky, J. Pumplin, C. Schmidt and 3 more. 2019

510 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/836d7f41b5f39ce7fd0e2cb6566e8444901e8527

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In Nuclear and High Energy Physics

Citations in the corpus

Measurement of the W boson mass (2021, background): “1, CT18 and MSHT20 PDF sets.”
Parton distributions and lattice-QCD calculations: Toward 3D structure (2020, methodology): “A methodology to study the sensitivity and the impact of specific data sets to the PDFs without the need of performing a fit was also developed (Hou et al., 2019a; Schmidt et al., 2018; Wang et al., 2018).”
The Forward Physics Facility: Sites, experiments, and physics potential (2021, methodology): “[298], as well as the CT18X PDFs [307] determined with a scale choice in DIS that mimics the impact of low-x resummation.”