[Cuga] GSPDA Lunch Seminar - Wednesday, November 19, 2025

[Sharice Smith]

Jefferson Lab's Graduate Student and Post-Doc Association Wiki:

https://gspda.jlab.org/wiki/index.php/Main_Page

This program is supported by the Initiatives Fund Program, a JSA commitment, to
support programs, initiatives, and activities that further the scientific outreach, promote
the science, education and technology of Jefferson Lab and benefit the Lab's extended
user community in ways that complement the Lab's basic and applied research missions.



                                                    Wednesday, November 19, 2025

                                                          ***CC F326/327***

                                                          12:00 pm - 1:00 pm

                                "Parton structure of the pion and kaon from QCD analysis of experimental & lattice data"

                                                            Wally Melnitchouk


Abstract:
This talk will review recent results from the JAM Collaboration on pion and kaon parton distribution functions (PDFs), constrained by experimental Drell-Yan and leading neutron electroproduction data, together with lattice QCD calculations of PDF moments. The analysis indicates a softer valence up-quark distribution in the K+ compared with the π+, and provides the first empirical evidence for significantly different valence up and anti-strange densities in the kaon. Inclusion of recent lattice calculations of gluonic pseudo Ioffe-time distributions also significantly reduces uncertainties on the gluon PDF, revealing a higher gluon density in the pion at large momentum fractions than in the proton.

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