Relativistic Heavy Ion Physics with ALICE

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Relativistic Heavy Ion Physics with ALICE

• By
• Bjørn S. Nilsen
• The Ohio State University

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Outline

• The ALICE detector
• MUON Arm, and new TRD.
• PHOS, and a Proposed EMCAL.
• The Quark Gluon Plasma
• How we can use Heavy flavor states, and jets to
  study the QGP.
• What the new detectors allow us to do.
• Conclusion

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(No Transcript)
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With EMCAL
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Interacting Nuclei

• RQMD simulation
• 5 TeV/n
• AuAu
• B5 fm

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Space-Time EvolutionPre-equilibrium

• Formation phase.
• Creation of Probes into the QGP.
• Hard scattering
• Heavy flavor production
• Quark/Gluon jet production
• Direct Photon production

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Gluon Saturation?
Q2sat8pasNc/(Nc2-1)?AxG(x,Qsat) ?A?A/pR2
?A1/3
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Space-Time EvolutionQGP

• Quart-Gluon Plasma Phase
• The Phase to be studied.
• Deconfined Quarks and Gluons.
• Chiral Symmetry resorted?

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The QGP
eLHC 20 eRICH eLHC 15-40
GeV/fm3 tQGP-LHC 2 tQGP-RICH
tQGP-LHC4-10 fm/c tQGP
tQGP tTherm tTherm
?30
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RICH
LHC
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Space-Time EvolutionPost QGP

• Hadron Gas
• Hadron formation
• Secondary interactions
• Free Streaming
• No Interactions
• Resonance decays
• Standard Vacuum

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ALICECharged Particle Acceptance
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DiMuonsHeavy Mesons
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Heavy Mesonsin Dimuons
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Dielectrons
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ALICE PhotonAcceptance
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2
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PhotonsPHOS
Identified Photon spectrum measured with 85-99
purity
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PHOS Pb-Pbp0 resolution
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PHOS AA _at_ LHC ?sNN 5.5 TeV,10 central g in
one year
With high pT trigger
Inclusive g (pQCDp0)
Direct g (pQCD)
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Expanded PHOSEMCAL
?-PHOS jet-TPC
Jet-TPC
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Further StudiesContinue

• With our first in a series of Physics Challenges,
  presently on going, we are reevaluating the
  performance of the full ALICE detector.
• This leads to another challenge, that of
  distributing all of the needed computing in an
  effective way.

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Conclusions

• With the PHOS, MUON arm, TRD, and the proposed
  EMCAL, ALICE will greatly improve its heavy
  flavor, direct photon,and jet physics
  capabilities.
• These new, more accessible, probes, along with
  ALICEs excellent soft physics capabilities, will
  help ALICE to study the Quark Gluon Plasma in
  greater detail.