PDF Flavor Determination and the nCTEQ PDFs
nCTEQ Collaboration: E. Godat, D. B. Clark, T. J. Hobbs, T. Jezo, J., Kent, C. Keppel, K. Kovarik, A. Kusina, F. Lyonnet, J.G. Morfin, F. I., Olness, J.F. Owens, I. Schienbein, J. Y. Yu
TL;DR
This paper explores how recent LHC proton-lead collision data can refine the determination of parton distribution functions, especially the strange quark distribution, by introducing an improved nCTEQ++ code for PDF fitting.
Contribution
The paper presents a new modular C++ implementation of the nCTEQ code that integrates various tools for improved PDF analysis using LHC heavy ion data.
Findings
LHC W/Z data enhances strange PDF constraints.
nCTEQ++ facilitates easier and more flexible PDF fitting.
Inclusion of pPb data improves proton PDF accuracy.
Abstract
Recent LHC W/Z vector boson production data in proton-lead collisions are quite sensitive to the heavier flavors (especially the strange PDF), and this complements the information from neutrino-DIS data. As the proton flavor determination is dependent on nuclear corrections (from heavy target DIS, for example), LHC heavy ion measurements can also help improve proton PDFs. We introduce a new implementation of the nCTEQ code (nCTEQ++) based on C++ which has a modular strucure and enables us to easily integrate programs such as HOPPET, APPLgrid, and MCFM. Using ApplGrids generated from MCFM, we use nCTEQ++ to perform a fit including the LHC W/Z vector boson data.
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