Charmonium dynamics in the UrQMD transport model Thomas Lang - PowerPoint PPT Presentation

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Charmonium dynamics in the UrQMD transport model Thomas Lang November 11, 2011 CPOD 2011 Thanks to Marcus Bleicher, Elena Bratkovskaya, Olena Linnyk Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Outline Charmonium in UrQMD 1 Results of UrQMD approach 2 Quark propagation in hydrodynamics 3 Summary 4 Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Charmonium suppression Normal suppression dissociation by nucleons can explain suppression except for central collisions Comover sceanrio dissociation by comoving mesons can explain charmonium R AA at SPS energies Recombination principle of detailed balance requires recombination formation rate proportional to the square of the number of unbound charm quarks Charmonium melting spectral function of charmonia broadens in QGP dissociation gets more likely complete breakup only at very high temperatures Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Implementation to UrQMD charm production points determined using Glauber model ⇒ UrQMD prerun to write down nucleon collision points momenta and yields of J / Ψs and D-Mesons are fitted to experimental data purely hadronic interactions with baryons and mesons elastic cross sections from effective Lagrangian calculations Ziwei Lin, C M Ko, J.Phys. G:Nucl.Part.Phys. 27 (2001) 617-623 inelastic cross sections taken from SPS-fits and two-body transition model fitted to data from Pb+Pb at SPS E. L. Bratkovskaya, W. Cassing, and H. Stoecker, Phys. Rev. C67, 054905 (2003) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Dissociation cross sections � 6 p f � m 3 + m 4 σ 1+2 → 3+4 ( s ) = 2 4 E 1 E 2 E 3 E 4 | M i | 2 √ s s p i cross sections with baryons independent on energy J / Ψ : 4 , 18 mb χ c : 4 . 18 mb Ψ ′ : 7 . 6 mb meson dissociation from π -, ρ , K and K ∗ -mesons E. L. Bratkovskaya, W. Cassing, and H. Stoecker, Phys. Rev. C67, 054905 (2003) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Regeneration cross sections p 2 σ 3+4 → 1+2 ( s ) = σ 1+2 → 3+4 ( s )(2 S 1 + 1)(2 S 2 + 1) f p 2 (2 S 3 + 1)(2 S 4 + 1) i D ¯ D → J / Ψ increased cross section for excited D-Mesons suppression for strange mesons E. L. Bratkovskaya, W. Cassing, and H. Stoecker, Phys. Rev. C67, 054905 (2003) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Outline Charmonium in UrQMD 1 Results of UrQMD approach 2 Quark propagation in hydrodynamics 3 Summary 4 Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary SPS Implementation reproduces schematic calculation of C. Spieles et. al. Pb − Pb , p lab = 200 GeV M.C. Abreu et al. (NA50 Collab.), Phys. Lett. B410 (1997) 327, 337 Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary RHIC - centrality dependence Purely hadronic UrQMD calculation does not match the data at RHIC Apparently strong recombination Au − Au , s 1 / 2 = 200 GeV , | y | < 0 . 35 PHENIX, A. Adare et al., Phys. Rev. Lett. 98, 232301 (2007) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Is a prehadronic phase the solution? implementation of a prehadronic phase to UrQMD to mime QGP below transition temperature normal hadronic model no recombination of D-Mesons above phase transition temperature no formation times ⇒ prehadronic cross sections at very high densities breakup of charmonium particles Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary SPS variables of new model are fitted to SPS data detailed balance model used shape fits well Pb − Pb , p lab = 158 GeV B.Alessandro et al. (NA50 Collab.), Eur.Phys.J. C39 (2005) 335-345 Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary RHIC Our model can reproduce rapidity dependence at RHIC same variables used as at SPS energies stronger recombination at midrapidity ⇒ less suppression at midrapidity Au − Au , s 1 / 2 = 200 GeV PHENIX, A. Adare et al., Phys. Rev. Lett. 98, 232301 (2007) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Different cross sections a lot of cross sections on the market possibility to test cross sections 1 non-perturbative quark-exchange model (K.Martins et al.) 2 constant cross section of 3 mb (R.Vogt et al.) 3 meson exchange model P.Braun-Munzinger, K.Redlich, Eur.Phys.J. C16 (2000) 519-525 (S.G.Matinian et al.) 4 perturbative QCD (D.Kharzeev et al.) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary J / Ψ suppression at LHC first measurements show that charmonium is suppressed at LHC R AA still missing higher D-Meson number has no effect due to energy density and phase space reasons Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary J / Ψ suppression in pp at LHC J / Ψ yield in pp used as reference value for heavy ion collisions high energy density possible suppression can be tested using different multiplicity bins dN final J / Ψ / dy | | y |≤ 1 R pp = dN initial J / Ψ / dy | | y |≤ 1 Similiar study of medium modifiaction of charm quarks in pp done by S.Vogel et al. (Phys.Rev.Lett 107 (2011) 032302) Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Heavy quarks in UrQMD we want to improve the prehadronic phase have a look at quark propagation in hydrodynamics (Phys. Rev. C 78 (2008) 044901) use of a Langevin model (R. Rapp, H. van Hees, Mar 2009, arXiv:0903.1096) test of different propagation coefficients and onset temperatures Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary R AA of heavy quarks initial quarks at midrapidity hadronization using Peterson fragmentation decay of electrons using Pythia Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary v 2 of heavy quarks flow strongly dependent on seton temperature paper in preparation with Jan Steinheimer, Hendrik van Hees, Marcus Bleicher Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Summary/Outlook realization of charmonium dynamics in UrQMD comparison to data for SPS and RHIC energies prehadronic phase needed for proper description suppression in pp collisions also Langevin approach for quark propagation in prehadronic phase calculation of more observables detailed comparison of different approaches and data Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary QCD phase diagram Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary Time evolution in HIC Charm quark mass ≈ 1 . 5 GeV charm production at early stage of collision in hard processes hadronization when the system cools down ideal probe for the whole collision Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model

Charmonium in UrQMD Results of UrQMD approach Quark propagation in hydrodynamics Summary QGP phase transition Szabolcs Borsanyi et al., arXiv:1005.3508 T.Matsui and H.Satz, Phys.Lett. B178 (1986) 416 Thomas Lang November 11, 2011 CPOD 2011 Charmonium dynamics in the UrQMD transport model