Speaker
Wally Melnitchouk
(Jefferson Lab)
Description
We perform a global QCD analysis of unpolarized PDFs in the proton, including new $W+$charm production data from $pp$ collisions at the LHC and semi-inclusive pion and kaon production data in lepton-nucleon DIS, both of which have been suggested for constraining the strange quark PDF. Compared with a baseline global fit that does not include these datasets, the new analysis reduces the uncertainty on the strange quark distribution over the range $0.01 < x < 0.3$, and provides a consistent description of processes sensitive to strangeness in the proton. The data place more stringent constraints on the strange asymmetry $s − \bar{s}$, which is found to be consistent with zero in this range.
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