QCD Theory @ EIC
Jian-Wei Qiu · 2016
How to "see" and quantify hadron structure?q Our understanding of hadron evolves Nucleon is a strongly interacting, relativistic bound state of quarks and gluons 1970s 1980s/2000s Now q Challenge: No modern detector can see quarks and gluons in isolation!q Question: How to quantify the hadron structure if we cannot see quarks and gluons?We need the probe!QCD factorization!Not exact, but, controllable approximation! q Answer: Hq (x, ⇠, t, Q), Ẽq (x, ⇠, t, Q) Different quark spin projection See also Weiss's talk q Connection to normal quark distribution: The limit when ⇠ !0 q its role in solving the spin puzzle: Ji, PRL78, 1997 Quark's orbital contribution to proton's spin?"Big" questions to be answered, … Effectively, QCD collinear factorization to connect GPDs to x-sections! q Exclusive vector meson production: t-dep J/Ψ, Φ,