ATHIC 2008, Tsukuba (Oct. 13-15)

QGP and Jets

王新年
Xin-Nian Wang
Lawrence Berkeley National Laboratory
China Central Normal University

Empirical Evidence of sQGP at RHIC

Pedestal&flow
subtracted

Hydro-dynamics calc.

Hard Probes & Structure of Dense Mattere-e-

Photon, Dilepton
EmissionJ/Ψ suppression
Medium response
Jet quenchingJet transport in medium
qq
Belitsky, Ji & Yuan’03…

0ApyAp“Leading-twist” or eikonal approx
Liang, XNW & Zhou’08

fAq (x, !k⊥ ) =!

dy − d2 y⊥ ixp+ y− −i!k⊥ ·!y⊥+−−e!A|ψ̄(0)γL(0,y,!
y)ψ(y, !y⊥ )|A"⊥
4π (2π)2

Jet transport in medium“Leading-twist” or eikonal approx
Liang, XNW & Zhou’08

Jet Transport
Operator
Classical correspondence:
Collinear q-g matrix elements All quark kT distr. info.

Jet transport parameter & medium

Liang, XNW & Zhou’08
Majumder & Muller’07
Kovner & Wiedemann’01

Solution of diffusion eq.
Jet transport parameter

Jet transport parameter & medium
Jet transport parameter

Multi-gluon correlation:
Gluon saturation
Casalderrey-Salana, XNW’07
Kochegov & Mueller’98
McLerran & Venugapolan’95

Gluon saturation in QGP
Gluon distr. from HTL at finite-T (gluon gas)
Casalderrey-Salana, XNW’07

DGLAP evolution in linearized regimeDirect Measurement of qhat
Strong coupling SYM:

Liu, Rajagopal & Wiedemann’06

Radiated & elastic energy lossqApq

Ap

Gyulassy & XNW’04
BDMPS’96
LCPI:Zakharov’96
GLV: Gyulassy, Levai & Vitev’01
ASW: Wiedemann’00
HT: Guo & XNW’00
AMY: Arnold, Moore & Yaffe’03

Wicks et al’06
Djordjevic et al’06
Vitev’06
XNW’06
Qin, et al’08

Hadron suppression & medium properties
Bass et al’08

OWWZ: Owen, Wang, XNW & Zhang’08

Cold nuclear matter in DIS
Wang & XNW’01

Jet Quenching phenomenology-fit to single hadron Raa in Au+Au at all centralities at RHIC energy
Phenix’08,

TECHQMOWWZ’08

Direct photons
Arnold, Moore & Yaffe’01, Baym et al’07
Fries et al’03, Turbide et al’06, Arleo’07, Vitev’08,
Majumder et al’08

Fragmentation γ and its suppression
Medium induced γ (v2)

See talks by: Sangyang Jeon and Fuming Liu

Gamma-jet Correlation
HSW: Huang, Sarcevic & XNW’96

See talk by H. Zhang

Isolated photons as tags:

OWWZ’08

Renk’06

Volume emission for small zT

Surface emission for large zT>1

Theoretical improvements
Elastic vs radiative: for finite E & L

Qin, et al ‘’08

Recoil in radiative process:Quark-annihilation
Flavor changing processq

NLO corrections to LO collinear
factorized contribution
Mass correction for heavy quarks

ApqAp

Heavy Quarks
Wicks et al’06,Djordjevic et al’06

ΔEel /ΔErad for heavy quarkis larger than light quarksLangevin Eq. for v<<1

Moore & Teaney’05

Talk by Y. AkamatsupQCD

Rcb Ratio

Strong coupling SYM
Casalderrey-Solana & Teaney’06
Gubser’06, Herzog et al’06

Horowitz & Gyulassy’08

Inclusion of multiple gluon emission
Modified DGLAP Evolution Eq.

q

Guo & XNW’00

Apq
ApArmesto, et al’08
Renk’08
Zapp et al’08

Effects of hydrodynamics
Gyulassy, et al’02

1D vs. 2+1D
Faster decrease in ρ
but increased duration

Liu, Rajagopal & Wiedemann’06

Effect of flow
Talk by T. Hirano

Baier, Mueller &Schiff’06

Effects of hydrodynamics

Some decrease in anisotropy of ΔE
in 1+2D without effect of flow
Viscous hydro, 3-D haydro:
effects are expected to be small
TECHQM for 3-D viscous hydroGyulassy, et al’02

Azimuthal anisotropy
OWWZ’ 2008

1+1D Bjorken

Bass et al’08

Medium response to jets
Sonic mach cones induced by propagating jets
Stocker’05, Casaderrey-Solana, Shuryak & Teaney’05

Mach cone angle:
Sound attenuation  with of the cone structure:
pQCD

SYM
η/s=1/4π

Neufeld, Muller & Ruppert’08

Chesler & Yaffe;07
Fries et al’07

Cone & ridge in parton cascade
Double peak structure was seen in AMPT simulation
Soft hadrons associated with a jet

Ma, et al ‘06

Minimum distance required

punch-through jets

Ridge along tangential jets
Longitudinal flow (Armesto et al’05)
Longitudinal field (Majumder et al’07)
Recombination (Hwa’05, Wong’ 07)

pT=0~1GeV/ctangential jets

Predictions for LHC
Charged Multiplicity

Summary• Jets in QGP provide unprecedented information about thedense matter produced in heavy-ion collisions• Jet quenching studies have become quantitative both intheory and phenomenology• Identified jets and gamma-jets offer more discriminating
information• Study the response of medium in terms of sonic mach cone
and ridge becoming a reality• LHC : expect to see the same trend. Most uncertainty
comes from initial conditions. But it will be measured.

Thank you !
ありがとう !
당신을 감사하십시오 !

谢谢 !