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EIC discussion : just questions

EIC discussion : just questions. Zhongbo Kang Los 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

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EIC discussion : just questions

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  1. EIC discussion: just questions Zhongbo Kang Los Alamos National Laboratory

  2. “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 • 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? • 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

  3. 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

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