Nuclear Physics Seminar

"Probing the Quarks inside the Proton"

Presented by Lingyan Zhu, Hampton University

Tuesday, October 18, 2011, 11:00 am — Small Seminar Room, Bldg. 510

Quarks are the fundamental building blocks of the visible matter in the universe. Nuclear experimentalists have been using different methods to probe the quarks and their dynamics inside the proton. I will sketch a big picture of the observations: from the proton's valence quark composition to the sea quark contribution; from the unpolarized quark content to the correlation between the transverse momentum and the proton and quark spins.
I will focus on a few puzzling and interesting topics:
quark counting rules to connect valence quark number and measured cross sections; the anti-down and anti-up quark asymmetry, possibly due to the asymmetric presence of the valence quarks; the valence down to up quark ratio at the Bjorken x --> 1 limit; the transverse-momentum-dependent parton distributions (TMDs) such as the Boer-Mulders and Sivers functions, related to the 3D quark structure of the proton.
In addition, I will briefly mention future opportunities.

Hosted by: Matthew Lamont

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