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Theory Comparisons W. A. Horowitz Theory Comparisons W. A. Horowitz

Theory Comparisons W. A. Horowitz - PowerPoint Presentation

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Theory Comparisons W. A. Horowitz - PPT Presentation

The Ohio State University June 19 2010 11162010 1 JET Collaboration Meeting at LBL With many thanks to Brian Cole Miklos Gyulassy Ulrich Heinz Jiangyong Jia and Yuri Kovchegov ID: 760390

jet 2010 meeting lbl 2010 jet lbl meeting collaboration wah pqcd npe cole ads phenix iaa angle prc81 large

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Slide1

Theory Comparisons

W. A. HorowitzThe Ohio State UniversityJune 19, 2010

11/16/2010

1

JET Collaboration Meeting at LBL

With many thanks to Brian Cole,

Miklos

Gyulassy

,

Ulrich Heinz,

Jiangyong

Jia

, and Yuri

Kovchegov

Slide2

Motivation for pQCD Theory Comparison?

Death of fragility:Density extracted (assuming infinite thy prec) to w/i 20-30%Proof of PrincipleWhat about other observables?Falsify before we quantify

11/16/2010

JET Collaboration Meeting at LBL

2

PHENIX PRL101 (2008)

Slide3

Uncertainty in Medium Extraction?

Is this a sys. th. unc. on a medium parameter?No! Experimentally all these models are falsified by datav2, IAA, NPE, ...No! Known important physics is missingElastic E-loss (dyn sc cent, vacuum rad, ...)What is the qhat from fully strongly coupled AdS?AdS is at least as right/wrong as pQCD

11/16/2010

JET Collaboration Meeting at LBL

3

Apples to oranges comparison

Slide4

JET Collaboration Meeting at LBL

4

Irony of Multiple Observables

v2 too small

NPE supp. too large

PHENIX, Phys. Rev. Lett. 98, 172301 (2007)

NPE v2

p

0

v

2

C. Vale for PHENIX, QM09 Plenary (analysis by R. Wei)

WHDG

11/16/2010

Wicks, WAH,

Gyulassy

,

Djordjevic, NPA784 (2007)

I

AA

, B/M,

g

-h, ...

Pert. at LHC?

Slide5

Comments on v2

CGC, fluctuations not enough for pQCD

AdS/CFT: DE ~ L3Better job?

11/16/2010

JET Collaboration Meeting at LBL

5

Glauber

KLN CGC

Solid: rotatedDashed: not rotated

PHENIX p0

WAH and J Jia, in preparation

Marquet

and Renk, PLB685 (2010)

Largest medium density w/

i

unc

. from R

AA

Slide6

Comments on NPE

Exp. converge in ppNB: pQCD calculations so far assume M << Eb corrections likely largec and b separationSuccess of AdS/CFT? dpT/dt = - m pT m = pl1/2 T2/2Mq

11/16/2010

JET Collaboration Meeting at LBL

6

WAH, PhD Thesis

Slide7

Uncertainties in Wide Angle Radiation

UVWhat about IR?

11/16/2010

JET Collaboration Meeting at LBL

7

WAH and B Cole, PRC81, 2010

Slide8

Collinearity and Gluon Mass

Massless gluons:Large IR cutoff sensitivityGluons with thermal mass

11/16/2010

JET Collaboration Meeting at LBL

8

BDMS, JHEP 0109 (2001)

WAH and B Cole, PRC81, 2010

Larger x better respects

kT << xE

~

Slide9

Results

Quantitatively compare to PHENIX dataAssumed infinite Elastic precision

11/16/2010

JET Collaboration Meeting at LBL

9

WAH and B Cole, PRC81, 2010

Slide10

Parton Energy Dependence

Dependence on parton energy

Uncertainty on qhatAssume all formalisms equally affected

11/16/2010

JET Collaboration Meeting at LBL

10

WAH and B Cole, PRC81, 2010

Slide11

v2: “Collinearly Safe”

Fix dNg/dy from RAA, calculate v2Expect larger v2 for smaller opening angle ( tcoh ~ 1/kT2 )IAA: coming soon

11/16/2010

JET Collaboration Meeting at LBL

11

Rad Only

Rad + El

WAH, in preparation

v

2

p

T

20-30% p0

20-30%

p

0

v2

pT

Data

Data

Slide12

Comments/Conclusions

These should be addressed in general (JET) and in TECHQM report in particularConsensus on missing & important physics?Wide angle radiation, dyn vs. static sc. cent., Poisson vs. Fokker-Planck, vacuum radiation,...NB: Elastic loss not yet addressed at allImportance/uncertainties?Falsify first, then quantifyConsensus that pQCD HI picture is in serious trouble?v2, IAA, NPE, ...Sim. mult. obs. description not possible, even with large unc. from wide angle radiationFuture work:Include missing physicsSim. remove collinear and small mass approx?Calculate more observables in pQCD and AdS/CFT: IAA, etc.

11/16/2010

JET Collaboration Meeting at LBL

12