Implications for LHC pA Run from RHIC Results CGC Glasma Initial Singularity Thermalized sQGP Hadron Gas -------------- sQGP --------------- Asymptotic.

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Presentation transcript:

Implications for LHC pA Run from RHIC Results CGC Glasma Initial Singularity Thermalized sQGP Hadron Gas sQGP Asymptotic Freedom: High density systems are weakly coupled because typical distances are short Possible to understand from first principles

Color Glass Condensate Color: Gluons are colored Condensate: Gluon occupation number is as large as can be, like Higgs condensate or superconductor High density of gluons is self generated Glass: The sources of gluon field are static, evolving over much longer time scales than natural one Resulting theory of classical field and real distribution of stochastic source is similar to spin glass Parton distributions replaced by ensemble of coherent classical fields Renormalization group equations for sources of these fields

Effective Theory of Color Glass Condensate Classical gluon fields at small x Static sources of gluon fields at large x Renormalization group changes what is source and what is field as energy increases. Renormalization group determines distribution of sources Fixed point of renormalization group => Universality of CGC Required to treat fields as classical for Evolution equations to all orders in the strength of gluon fields: JIMWLK; Balitsky-Kovchegov

Increasing gluon density seen in DGLAP and BFKL evolution equations Typical gluon size 1/Q DGLAP: From momentum Q_0 compute distribution at Q at fixed x Number of gluons grows but gluons decrease in size rapidly: Dilute limit BFKL: From x_0 to x at Q: Number of gluons grows but gluons of fixed size: High density limit How does density at fixed size stop growing? gluons with interaction strength are a hard sphere. When all gluons with are filled, then begin filling with higher momentum Gluons Saturated. Grows

Theory of CGC: First Principles from QCD Requires saturation momentumWhen is it true? Experimental Evidence: ep Collisions Distributions from NLO BK-JIMWLK evolution

Kinematic Reach in pA Collisions

Slide from Albacete

Two Particle Correlations Increase saturation momentum by going forward or making centrality cut Phenix

Collisions of two sheets of colored glassSheets get dusted with color electric and color magnetic fields The initial conditions for a Glasma evolve classically and the classical fields radiate into gluons Longitudinal momentum is red shifted to zero by longitudinal expansion But the classical equations are chaotic: Small deviations grow exponentially in time Glasma: Matter making the transition for Color Glass Condensate to Quark Gluon Plasma Long range color fields form in very short time Maximal local density of topological charge: Large local fluctuations in CP violating

Dependence of Multiplicity on Energy Understood

Transverse momentum distributions in LHC pp collisions have geometric scaling Fluctuations in pp collisions follow predictions form CGC-Glasma Negative binomial and KNO quantitatively predicted by CGC-Glasma

Negative binomial distribution parameters and KNO scaling predicted by CGC Important for higher order vn flow analysis, and inclusive ridge

STAR (arXiv: ) Near-side correlations, ΔΦ<<π (the “ridge”) PYTHIA pp, p T trig > 2.5 GeV PHOBOS (arXiv: ): Causality requires that correlations of long range in rapidity must be made very early: Not originating in QGP Not jet interactions

CMS Sees Ridge over 8 units of rapidity! High Multiplicity Events p_T ~ 1-3 Gev

The Ridge is a Snapshot of a Color Electric or Magnetic Flux LHC: Tubes exist on sub-fermi transverse size scale Perhaps as small as.2 Fm They are formed very early in the collision Angular peaking: Intrinsic peaking at emission? Opacity? Flow or nascent flow effects? Probably different combination of mechanisms: High multiplicity pp High transverse momentum AA Inclusive AA

Sources of Initial Fluctuations in the Transverse Plane: (always need longitudinal correlations generated by tubular flux tube structures) Fluctuations of positions of nucleons in the collisions Fluctuations in the multiplicity of decays of flux tubes (a boost invariant negative binomial distribution)

J/Psi Production If J/Psi mass is less than saturation scale, J/Psi is like a low mass hadron

Comparison of expectations from CGC for R_AA expectations at RHIC at forward rapidity Solid lines are expectations. First four are various centralities of AA Bottom is dAu

New Phenix Data