Workshop on the physics of HL-LHC, and perspectives at HE-LHC

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Presentation transcript:

Workshop on the physics of HL-LHC, and perspectives at HE-LHC 05/11/11 Open Questions: Heavy Ion Physics in HL-LHC and Beyond Yen-Jie Lee Massachusetts Institute of Technology Workshop on the physics of HL-LHC, and perspectives at HE-LHC 1 November, 2017 Open Questions: HI Physics in HL-LHC and Beyond

Open Questions: HI Physics in HL-LHC and Beyond QCD Phase Diagram Is there evidence for a chiral phase transition? What is the evidence of an increase in the number of degrees of freedom as the QGP is formed? It should be about a factor 10. Is it possible to see a first order phase transition when we have high baryon density? Open Questions: HI Physics in HL-LHC and Beyond

Early Stages of the Collisions QGP What is the state of matter before the collisions happen? What happened between the collision and the production of the QGP? How does the strongly interacting medium emerge from an asymptotic free theory (QCD)? Is the produced system in equilibrium at “birth” or does it thermalize and equilibrate as a result of interactions, after the initial collision (or both)? How can we show it experimentally? Open Questions: HI Physics in HL-LHC and Beyond

The Strongly Interacting Medium What is the evidence that the strongly interacting medium we see is really a deconfined liquid? Can we see quasi particles (quarks and gluons) in the QGP? Is the medium smooth like a clam chowder, smoothie, or much smoother like water? Could we see medium response (recoil, Mach cone and wake) in the Quark Gluon Plasma? How are hadrons produced in AA, pA and dA collisions? Are they the same or different from pp collisions? Open Questions: HI Physics in HL-LHC and Beyond

Detailed Understanding of Jet Quenching What, in reality, is the mechanism of jet and hadron quenching? Is the thermalization of the jets (and the heavy quarks) the same mechanism as the one responsible for hydrodynamic flow? Are jets quenched in smaller system? What is the minimum requirement? How do we detect jet quenching in high multiplicity pp? (if any) HYBRID Open Questions: HI Physics in HL-LHC and Beyond

Detailed Understanding of Quarkonia Production What is the mechanism of Quarkonia suppression in pPb and PbPb collisions? Why are the excited states of Quarkonia more suppressed than the ground state in high multiplicity pp and pPb events? Have we observed low pT J/ψ from recombination? Open Questions: HI Physics in HL-LHC and Beyond

Similarity of ee, pp, pA and AA collisions Why are (ee), pp, pA and AA collisions so similar? What is the origin of the “flow like” signal in pp and dA and pA collisions? Does the strange hadron to pion ratio saturate at high multiplicity pp and pA collision? How are hadrons produced in AA, pA and dA collisions? Are they the same or different from pp collisions? Open Questions: HI Physics in HL-LHC and Beyond

Open Questions: HI Physics in HL-LHC and Beyond “New Physics” in QGP Chiral Magnetic Effect? Vortices? Production of jets with exotic structure? (.. new particle which could only be produced in the bath of color field?) Quark Gluon Plasma Open Questions: HI Physics in HL-LHC and Beyond

Open Questions: HI Physics in HL-LHC and Beyond One day, in my dream… LHC HL-LHC QGP property QGP property HF hadrons Quarkonia Jets T Time p T Time p Open Questions: HI Physics in HL-LHC and Beyond