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The extraction of the strange quark parton distribution function (PDF) posesa long-standing puzzle. Measurements from neutrino-nucleus deep inelasticscattering (DIS) experiments suggest the strange quark is suppressed comparedto the light sea quarks, while recent studies of W/Z boson production at theLHC imply a larger strange component at small x values. As the parton flavordetermination in the proton depends on nuclear corrections, e.g. fromheavy-target DIS, LHC heavy ion measurements can provide a distinct perspectiveto help clarify this situation. In this investigation we extend the nCTEQ15nPDFs to study the impact of the LHC proton-lead W/Z production data on boththe flavor differentiation and nuclear corrections. This complementary data setprovides new insights on both the LHC W/Z proton analyses and theneutrino-nucleus DIS data. We identify these new nPDFs as nCTEQ15WZ. Ourcalculations are performed using a new implementation of the nCTEQ code(nCTEQ++) based on C++ which enables us to easily interface to externalprograms such as HOPPET, APPLgrid and MCFM. Our results indicate that, assuggested by the proton data, the small x nuclear strange sea appears largerthan previously expected, even when the normalization of the W/Z data isaccommodated in the fit. Extending the nCTEQ15 analysis to include LHC W/Z datarepresents an important step as we advance toward the next generation of nPDFs.

Impact of LHC vector boson production in heavy ion collisions on strange PDFs