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ICNFP, Crete 28.08-05.09 2013. Universality of QCD Hadronization. Reinhard Stock. The Veneziano -Webber Model e + e - Annihilation to Hadrons: QCD DGLAP. Note: the photon is “virtual”: It has E CM but no P CM! For “real” particles: E 2 = p 2 + m 2 Virtuality ≈ virtual mass!

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ICNFP, Crete

28.08-05.09 2013

Universality of

QCD Hadronization

Reinhard Stock

the veneziano webber model e e annihilation to hadrons qcd dglap
The Veneziano-Webber Modele+e- Annihilation to Hadrons: QCD DGLAP

Note: the photon is “virtual”:

It has ECM but no PCM!

For “real” particles: E2 = p2 + m2

Virtuality ≈ virtual mass!

End of pQCD phase: spatial order of color in “cluster” regions:

“Color pre-confinement!”

qcd evolution in di jet hadronization the singlet cluster mass spectrum
QCD Evolution in di-jet Hadronization: The Singlet Cluster Mass Spectrum

The Code “HERWIG”

pQCD invariant mass of clusters gets reinterpreted in non-pertubative language:

“Condensates, hadronic mass”

Statistical decay into on-shell hadron spectrum

Phase space dominance

B.R. Weber, Nucl.Phys.B238 (1984) 492

parton cascade description of heavy ion collisions at cern klaus geiger 1998
Parton Cascade Description of Heavy-Ion Collisions at CERN ? (Klaus Geiger, 1998)

Evolution of mid-rapidity energy density (J.Ellis and K.GeigerPhys.Rev. D54 (1996) 1967)

Note: Hadron formation occurs at about 0.7 GeV/fm3

Like in the statistical Hadronization Model

the hagedorn legacy statistical hadronization model
The Hagedorn Legacy: Statistical Hadronization Model

Francesco Becattini

Nucl.Phys. A702 (2002) 336

LEP data

Canonical statistical model analysis

T≈160 MeV

the hadronization temperature

Phase space weights plus quantum number conservation

a more recent version of e e annihilation analysis 2008
A more Recent Version of e+e- Annihilation Analysis (2008)

F.Becattini, P.Castorina, J.Manninen and H.SatzEur.Phys.J. C56 (2008) 493

T=164 MeV

statistical hadronization model in a a collisions
Statistical Hadronization Modelin A+A Collisions

P. Braun-Munzinger, J.Stachel

arXiv:0901.2500 (2009)

RHIC data, Au+Au, 200 GeV

Grand Canonical statistical model analysis

T≈162 MeV

the hadronization temperature ?

sketch of the qcd phase diagram
Sketch of the QCD Phase Diagram

Assumption in the stat. model analysis:

Hadron abundances freeze out directly at QCD hadronization and thus survive the hadronic expansion stage



Regeneration also active.

  • Effect depends on energy
  • Survival factors from UrQMD

LHC at 2.76 TeV, Central Pb+Pb

F.Becattini et al., arXiv:1212.2431 (accepted by PRL)

T as in e+e- Annihilation