Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba1 Collective property of QGP in high-energy heavy-ion collisions at LHC Inst. of Physics, Univ. of Tsukuba ShinIchi Esumi Contents (1) charged multiplicity, stopping (2) chemical and thermal property (3) elliptic flow and quark coalescence (4) space-momentum-correlation in HBT (5) jet modification in away-side (6) jet modification in same-side “ridge” (7) mach-cone

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba2 W. Busza, LHC Workshop, May/2007 Total charged particle multiplicity distribution Measured trend at AGS-SPS-RHIC energies is extrapolated to LHC energy. About 60% increase in dN/d  from RHIC to LHC, which is 2.6 times in total yield.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba3 ‘ net ’ proton dN/dy AGS SPS RHIC 62 RHIC 200 LHC 5500 (BRAHMS preliminary) net-Baryon distribution (stopping  transparent) NA49 preliminary This tells us how the initial Baryon density is distributed in the final rapidity density. A wide net-Baryon free region will be formed in the mid-rapidity.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba4 Phys. Rev. C 73(2006) P.Braun-Munzinger, LHC Workshop, May/2007 Chemical equilibrium Chemical freeze-out : the end of inelastic scattering during collisions, where particle abundances are frozen. Various particles ratios and yields are fitted with thermal models in order to extract a common chemical freeze-out temperature and potentials for all the particle species at each beam energy. T ch : 160~170MeV

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba GeV W. Busza, LHC Workshop, May/2007 Elliptic flow: v 2 vs  x z Memory of the initial geometrical overlap and pressure followed by the collective expansion. I’m still puzzled by the shape peak structure in the mid-rapidity unlike the most of all the other experimental observables. v 2 : ~ 7.5%

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba6 Although the mass ordering is rather well reproduced by hydro-dynamic picture, later hadronic re-scattering during the collision seems to be important to reproduce  dependence of v 2 as well as for p T dependence of v 2 and p T distributions.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba7 Phys. Rev. Lett. 99, (2007) Phys. Rev. Lett. 98, (2007) Particle identified v 2 at RHIC STAR preliminary Number of constituent quark scaling in hadron v 2 as well as multi-strange baryon v 2 : v 2 is already established during the quark phase before the hadronization. This seems to be true even for heavy quark like charm. QM06

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba8 K.Schweda, ISMD, Aug/2007 S.Bass, LHC Workshop, May/2007 Kinetic-thermal equilibrium TT T fo Stronger radial expansion is expected with similar thermal freeze-out temperature or slightly lower temperature... Kinetic-thermal freeze-out : the end of elastic scattering during collisions, where momentum spectra are frozen. p T spectra are fitted with hydro-dynamics inspired “blast-wave” model in order to extract a common thermal freeze-out temperature and radial expansion velocity for all the particle species at each beam energy. T fo : 100~140MeV

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba9 C. Ko, LHC Workshop, May/2007 Radial flow Stronger radial expansion will enhance the effect of mass dependence of both transverse momentum spectra and v 2. We will know about the freeze-out temperature and final transverse flow velocity, but in general we would not know where the origin of the expansion is; partonic or hadronic. Detailed shape analysis of v 2 and p T spectra could tell us about it in model dependent ways.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba10 Ann. Rev. Nucl. Part. Sci. 55, 311 (2005) Source size measurement with HBT radius Very weak energy dependence on the measured radius parameters from AGS-SPS-RHIC. HBT radii do not represent the entire source but the local source size given by space-momentum correlation, because of a dynamically expanding source in stead of a static source.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba11 AMPT LHC C. Ko, LHC Workshop, May/2007 AMPT RHIC positive x-p correlation : shift in X out positive x-t correlation : reduces R out

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba12 RHICSPSRHIC PHENIX nucl-ex/ Jet pair correlation Suppression at higher p T Modification at low-mid p T S.Kniege, ISMD 2007 associate particle 1 associate particle 2 parton 1 parton 2  2  1 azimuthal angle trigger particle

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba13 mach-cone deflected data Same Side Away Side J. Ulery, ISMD 2007 QM06 3 particle correlation mach-cone/Cherenkov-like or deflected jets 80(deg) from away side center 90(deg)  1 -  trigger (rad)  2 -  trigger (rad) d-Au Au-Au 10-30% deflected mach-cone deflected mach-cone

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba14 I AA p T B (GeV/c)  =  B -  A (rad) arXiv: [nucl-ex] Away side shoulder region is universal, which is independent with trigger p T and centrality selection. Modification of away-side jet shape Softening of away side head region, which is consistent with energy loss scenario.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba15  ridge    ridge jet jet+ridge after v 2 subtraction STAR preliminary “jet” slope ridge slope inclusive slope p T trig (GeV/c) STAR preliminary yield ,  ) N part 3 GeV/c 2 GeV/c Jet+Ridge (  ) Jet (  ) Jet  ) Au+Au, 0-5% d+Au, % J. Bielcikova, WWND 2007 Modification of same-side jet shape “ridge” J. Bielcikova, ISMD 2007 Same side “ridge” is also as soft as inclusive.

Japanese Physics Society meeting, Hokkaido Univ. 23/Sep/2007, JPS meeting, Sapporo, JapanShinIchi Esumi, Inst. of Physics, Univ. of Tsukuba16 Bulk property at LHC (1) charged multiplicity, stopping (2) chemical and thermal property (3) elliptic flow and quark coalescence (4) space-momentum-correlation in HBT (5) jet modification in away-side (6) jet modification in same-side “ridge” (7) mach-cone GSI-FAIR-CBM BNL-RHIC-STAR BNL-RHIC-PHENIX CERN-LHC-ALICE CERN-LHC-CMS CERN-LHC-ATLAS