if we have measured collinear unpolarized pdfs up to enough accuracy, so what? answer from hep:...
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EIC discussion: just questions
Zhongbo KangLos Alamos National Laboratory
“So what” questions: from outside “EIC” community
If we have measured collinear unpolarized PDFs up to enough accuracy, so what? Answer from HEP: high precision, chance for BSM physics
If we measure helicity distribution to high accuracy, so what? Answer from EIC community: proton spin
What do we learn? Answer from EIC community: confined motion, 3D tomography,
gluon saturation, nonlinear QCD dynamics, … These questions have been asked by many people and many times
An ANL physicist (nonperturbative QCD) 2012 An INT physicist (nuclear astrophysics) 2013 A Stony Brook physicist (RHIC HIC hydrodynamics & flow) 2014
If we have measured TMDs, spin asymmetries, small-x UGDs up to 1% accuracy, so what?
If we have understood the associated QCD dynamics, e.g., as described by TMD/small-x evolution, so what?
Central theme?
Do we have a central theme for EIC? “Understanding the glue that binds us all” (from EIC white paper
title). Is this the central theme for our EIC? Do we want to emphasize/sharpen more on this Is it “attractive” enough to outside community?
Every machine has a “big” program. However, presenting “one” central theme is a very good/quick way to catch the attention from the broader community LHC: “God” particle (Higgs) RHIC: Quark Gluon Plasma