# Presentation: 879595

## Summary of ISMD07

- Zhangbu Xu (BNL)

**Remarks for ISMD07**

## Three Ingredients for ISMD07

## QCD and jet

- Peculiar theory of color --
- weak at large momentum and short distance
- Confined – required energy grows with distance
- no FREE quark or gluon, fragment to “**jet**”– cluster of color-neutral particles
- Generate most of the mass of visible world (m=E/c2)

**F. Wilczek, H.D. Politzer, and D.J. Gross, 1973; Nobel Prize 2004**

**jet**

- LEP at CERN

- Important for LHC p+p and Heavy Ion Collisions

**Speed is one of the issues of jet**

## High-energy jet for PDF/pQCD

**Good agreements with pQCD, ****provide further constraints on PDF, ********s**
**Understanding background to new physics**

- N. Coppola
- B. Mohanty
- K. Hatakeyama

## Small-x

- T. Ullrich

**CDM/Saturation/****C****G****C**

## Forward Jets

**New measurement ZEUS 98-00 data: 2 < ****η****jet**** < ****4.3 ****(FwdPlugCal)**
**DIS: 20 < Q****2****< 100  GeV****2**** ;     10****-4**** < x****Bj**** < 5 x10****-3 **** ; **
**x****jet**** > 0.036   ******** Enhance BFKL expected behaviour**
**LO-DGLAP fails completely**
**NLO-DGLAP well below data at low *****x***** (as seen by H1)**
**Color-Dipole Model can describe the data**
**A. Polini: Multi-jets for small-x**

**ZEUS: DESY-07-102**

** ****Eur. Phys. J. C46 (2006) 27 **

**ZEUS**

## Does CGC describe Diffraction?

**J/******

- 1994 data described by --E. Levin
- Have alternatives been ruled out?
- New and more precise data -- H. Jung

## Future Electron-Ion Collider

- Study **GLUE** in Matter – T. Ullrich

## Ready to heat up?

- Initial Condition and a probe

## Jet Quenching Fundamentals I 

- B. Mohanty,
- J. Franz
- E. Wang
- K. Fialkowski
- Suppression,
- Color factor
- q/g convertion

## Jet fundamentals II

- Under specific condition, jets seem to act as unmodified
- Ridged subtracted, 2+1 jets (J. Bielcikova, O. Barannikova)

## Jet structure => Flow

- Putschke, QM06
- J. Bielcikova

- R

- J

- ridge  R _J_et     J

- R. Hwa:  **Ridgeology**

- Initial geometry and surface effects create semi-hard partons only perpendicular
- To surface, energy loss of these partons creates effective v2
**Where does the energy flow of the away-side jet go?**

## Jet-Medium Coupling

- What happens to the jets’ lost energy? What part is “heating” the
- plasma, what part is redistributed into excitations of the medium?

- Colorful Modes:  	longitudinal modes => Mach cones	J. Ruppert & B. Müller (Phys.Lett.B618:123-130,2005)	transverse modes  => Cherenkov (like) radiation	I. Dremin, (e.g Nucl.Phys.A767:233-247,2006), 	A. Majumder et al. (e.g. Phys.Rev.Lett.96:172302,2006)
- 2)  Colorless (hydrodynamical) mode => Mach conesH. Stöcker et al. (e.g. Nucl.Phys.A750:121-147,2005),J. Casalderra-Solana et. al. (e.g. Nucl.Phys.A774:577-580,2006),T. Renk & J. Ruppert (e.g. Phys.Rev.C73:011901,(2006))

- J. Ruppert, I. Dremin

## Is there a structure?

- Yes,
- Beam energies (SPS->RHIC)
- Particles

- J. Jia, S. Kniege
- A. Sickles

## Is it a wave?

- 3-particle correlation
- Cone like structure:
- SPS, RHIC
- J. Ulery, S. Kniege

## Hydrodynamics, not just -meson 

- in pT < 1 GeV/c

- Just after hadronization

- Hydro+Cascade

- T = Tsw = 169 MeV

- b=7.2fm

- b=7.2fm

- TH et al. (in preparation).

- Hadronization is just taking a chunk of “matter” and converting into hadron,
- Constituent Quark Scaling at intermediate pT?Initial condition from CGC requires softer EoS, lower  /s (A. Dumitru)
- Good opportunity to use charm, , and  to check the theory

- T. Hinaro

## Heavy-Hadron flow

- Hydro: (T. Hirano)
- V2 from early stage
- Mass ordering in haronic stage
- Radial flow 50%+50%
- Ridgeology: (R. Hwa)
- v2 from hadronization
- Radial flow early?

## What is v2 fluctuation?

- Identity Crisis:
- STAR and PHOBOS have observed large fluctuations of *final state hadron *v2
- Even Final State hadron v2 should not contain non-flow components, v2 should be in the hydrodynamics sense
- How do theorists (NeXSPheRio, CGC) define v2 fluctuation?

- G. Roland, F. Grassi

- Nice probe of fluctuation if Initial state is understood Energy Scan

## What is the signatures of Phase transition?

- M. Bleicher
- P. Seyboth
- R. Lacy: /s

## Imaging the source

- New techniques, exotic correlations

- A. Kisiel, P. Chung, P. Danielewicz

## THE HBT puzzle

- Sizes depend on EOS/breakup criteria
- ...

- Discrapance at 25% level
- Viscosity, Inflation and Tsunamis Help Explain HBT Puzzle

- S. Pratt

- No THE puzzle any more

## New HBT puzzling result

- M. Lisa

## ,p-p,

- p-p

- Kisiel
- D. Muller
- G. Miller

- p-p

## Look up the SKY for inspiration

- P. Huentemeyer

## GZK

- Nuclear physics works in SKY!
- Understand the sources
-  rays as well: A. Weinstein, P. Huentemeyer

- K. Martens, J. Neto

- p+  p+e++e-

**p+********  ********  ********(1232)  ********  ********+N**

## Saturation at VHECR?

**Phys.Rev.Lett.94:231801,2005**

- G. Farrar, J. Neto, H. Weigert
- K. Martens,

- LHC, eA will help

## Do we have the same (troubling) charm?

- X. Dong, G. Farrar et al.

## Predictions by experimentists

- Multiplicity
- HBT
- Flow

- R. Lacy: /s (D. Kharzeev et al.)

- M. Lisa
- T. Humanic
- K. Schweda

## Final Remarks

- One distinguished guestGeorge Smoot
- One movieBruno Touschek and the Art of Physics
- One BBQ
- Two AdS/CFT Correspondences(PomeronGraviton, TBH)
- 76 talks
- Many future projects(RHIC II, LHC, EIC, TA/TALE,HAWC,ARIANNA)
- 5 days of physics – PRICELESS!!!