"ab initio approaches in many-body qcd confront heavy-ion experiments" heidelberg, germany...
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"Ab initio approaches in many-body QCD confront heavy-ion experiments"
Heidelberg, Germany on December, 2014.
Probing the QGP across length scales…Jamie Nagle, University of Colorado
x100x5
x2
Search your feelings… You know it to be true
x1/10
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Proton + Nucleus CollisionProjectile, Target Participants
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MC Glauber – initial energy density of participants, large eccentricities from fluctuations
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IP Glasma– initial energy density only in region where nucleons overlap, much smaller eccentricities
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Initial Geometry + Hydrodynamics
IP Glasma + Hydro – under-predicts p+Pb v2 and v3 by x3
One could enhance the effect by including fluctuating proton shape,still smaller initial size
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Glauber + Hydro (Bozek) – qualitative description of v2 and v3no pre-equilibrium, no hadronic cascade
Romatschke et al. Hydro + Cascade
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ALICE Experimentp+Pb @ LHC
PHENIXd+Au @ RHIC
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Geometry Engineering
http://arxiv.org/abs/arXiv:1312.4565
Proposal to run “triangular” system
at RHIC
Small systems challenge our picture of required time and
size scales
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Not Enough Time?Tf = 150 MeV Tf = 170 MeV
v2
v3
e2
e3
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Glauber IC + Hydro (h/s=1/4p) + Hadronic Cascade (PRL 2014)Dashed Lines – adding pre-flow (Romatschke’s AdS/CFT calc.)
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IP Glasma gives very different eccentricity from Glauber in pA(Schenke, Venugopalan)
However, in d+Au and 3He+Au, the eccentricity is driven by the 2 and 3 hot stops,
not their individual geometry
Note though that the IPGlasma has a smaller hot spots with higher energy density that result in
more rapid radial expansion
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IP Glasma + MUSIC (h/s = 1.5 x 1/4p)Much larger initial radial expansion, but also no late cascade
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Need to look for all the usual signals in p(d/He)+AAnd with theory tools understand new ones…
d/He+Pb Workshop for LHC ?
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Most Perfect Fluid
Key part of RHIC and LHC future program
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Deeper Connections
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Key Probes at RHIC and LHC
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BaBar Magnet 1.5 T
Coverage |h| < 1.1
All silicon trackingHeavy flavor tagging
ElectromagneticCalorimeter
Two longitudinal Segment Hadronic
Calorimeter
High data acquisition rate capability ~ 15 kHz http://www.phenix.bnl.gov/phenix/WWW/publish/documents/sPHENIX_proposal_19112014.pdf
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G. Roland – QCD Town Meeting
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sPHENIX + RHIC Luminosity 0.6 trillion Au+Au collisions
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Flat or not flat – what is the physics?
Precision at LHC and doubling the pT range at RHIC
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Enhanced Sensitivity at RHICTrigger Jet R=0.2
Away Side JetR=0.2, 0.4, 0.7
Look for jet energy shifted to larger radius or underneath and equilibrated.
JEWEL predicts huge effect at RHIC.
Good purity even for large R jets!
IAA
IAA
fakejets
Reco. jets
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Beauty Tagged Jets at RHIC
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Variety of proven techniques: soft lepton tagging, track counting,
secondary vertex reconstruction
Key tests of mass dependence of radiative energy lossAgain, crucial to have overlapping energy ranges with RHIC and LHC
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Upsilon Probes
Inverse Length [1
/fm]
Precision measurement at LHC (and more to come).
Needs precision RHIC p+p, p+A, A+A to map out temperature and
coupling dependence
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pT Dependence p+A Dependence
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Summary
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‘How’ and ‘why’ questions on the QGP will be left with incomplete answers without sPHENIX in conjunction withongoing RHIC and LHC program
p+Au, p+Al at RHIC this springBringing the full picture into view
Full connection of RHIC and LHC small system data needed