Speaker
Dr
Wally Melnitchouk
(Jefferson Lab)
Description
We review recent results from the JAM Collaboration on pion and kaon PDFs obtained from global QCD analysis of experimental Drell-Yan and leading neutron electroproduction data, together with lattice QCD calculations of PDF moments and Ioffe time distributions. The analysis indicates a softer valence up-quark distribution in the $K^+$ compared with the $\pi^+$, 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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Author
Dr
Wally Melnitchouk
(Jefferson Lab)
Co-authors
Alex NieMiera
(Michigan State U.)
Chueng Ji
(NCSU)
Fernanda Steffens
(Bonn)
Huey-Wen Lin
(Michigan State U.)
Nobuo Sato
(Jefferson Lab)
Patrick Barry
(ANL)
William Good
(Michigan State U.)