Japanese Physics Society meeting Hokkaido Univ Collective property

Japanese Physics Society meeting, Hokkaido Univ. Collective property of QGP in high-energy heavy-ion collisions at LHC Inst. of Physics, Univ. of Tsukuba Shin. Ichi 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 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 1

Japanese Physics Society meeting, Hokkaido Univ. Total charged particle multiplicity distribution Measured trend at AGS-SPS-RHIC energies is extrapolated to LHC energy. About 60% increase in d. N/d from RHIC to LHC, which is 2. 6 times in total yield. W. Busza, LHC Workshop, May/2007 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 2

Japanese Physics Society meeting, Hokkaido Univ. net-Baryon distribution (stopping -> transparent) 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. AGS ‘net’ proton d. N/dy NA 49 preliminary SPS RHIC 62 (BRAHMS preliminary) RHIC 200 LHC 5500 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 3

Japanese Physics Society meeting, Hokkaido Univ. 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. Tch : 160~170 Me. V Phys. Rev. C 73(2006) 034905 P. Braun-Munzinger, LHC Workshop, May/2007 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 4

Japanese Physics Society meeting, Hokkaido Univ. Elliptic flow: v 2 vs z x 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. W. Busza, LHC Workshop, May/2007 19. 6 - 200 Ge. V 23/Sep/2007, JPS meeting, Sapporo, Japan v 2 : ~ 7. 5% Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 5

Japanese Physics Society meeting, Hokkaido Univ. 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. 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 6

Japanese Physics Society meeting, Hokkaido Univ. Particle identified v 2 at RHIC Phys. Rev. Lett. 99, 052301 (2007) 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. Phys. Rev. Lett. 98, 172301 (2007) QM 06 STAR preliminary 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 7

Japanese Physics Society meeting, Hokkaido Univ. Kinetic-thermal equilibrium 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. b. T Stronger radial expansion is expected with similar thermal freeze-out temperature or slightly lower temperature. . . Tfo : 100~140 Me. V K. Schweda, ISMD, Aug/2007 S. Bass, LHC Workshop, May/2007 Tfo 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 8

Japanese Physics Society meeting, Hokkaido Univ. 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. C. Ko, LHC Workshop, May/2007 23/Sep/2007, JPS meeting, Sapporo, Japan C. Ko, LHC Workshop, May/2007 Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 9

Japanese Physics Society meeting, Hokkaido Univ. 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. Ann. Rev. Nucl. Part. Sci. 55, 311 (2005) 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 10

Japanese Physics Society meeting, Hokkaido Univ. positive x-p correlation : shift in Xout positive x-t correlation : reduces Rout C. Ko, LHC Workshop, May/2007 AMPT RHIC AMPT LHC 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 11

Japanese Physics Society meeting, Hokkaido Univ. Jet pair correlation Suppression at higher p. T Modification at low-mid p. T parton 1 trigger particle azimuthal angle 2 1 associate particle 2 parton 2 RHIC SPS PHENIX nucl-ex/0611019 S. Kniege, ISMD 2007 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 12

Japanese Physics Society meeting, Hokkaido Univ. 3 particle correlation J. Ulery, ISMD 2007 Au-Au 10 -30% ed ct 80(deg) co h- ac de fle 90(deg) m from away side center ne ne co h- ac m de fle ct ed d-Au 2 - trigger (rad) mach-cone/Cherenkov-like or deflected jets 1 - trigger (rad) QM 06 deflected mach-cone Same Side data Away Side 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 13

Japanese Physics Society meeting, Hokkaido Univ. Modification of away-side jet shape ar. Xiv: 0705. 3238 [nucl-ex] IAA = B- A (rad) Softening of away side head region, which is consistent with energy loss scenario. <p. TB tranc. > p. TB (Ge. V/c) Away side shoulder region is universal, which is independent with trigger p. T and centrality selection. 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 14

Japanese Physics Society meeting, Hokkaido Univ. 2 subtraction Au+Au, 0 -5% jet+ridge 3 Ge. V/c < p. Ttrigger< 4 Ge. V/c and p. Tassoc > 2 Ge. V/c yield , ) Modification of same-side jet shape “ridge” after v STAR preliminary Jet+Ridge ( ) Jet ) Npart d+Au, 40 -100% J. Bielcikova, WWND 2007 J. Bielcikova, ISMD 2007 “jet” slope ridge slope inclusive slope Same side “ridge” is also as soft as inclusive. STAR preliminary p. Ttrig (Ge. V/c) 23/Sep/2007, JPS meeting, Sapporo, Japan Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 15

Japanese Physics Society meeting, Hokkaido Univ. CERN-LHC-ATLAS CERN-LHC-ALICE 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 23/Sep/2007, JPS meeting, Sapporo, Japan CERN-LHC-CMS GSI-FAIR-CBM BNL-RHIC-PHENIX BNL-RHIC-STAR Shin. Ichi Esumi, Inst. of Physics, Univ. of Tsukuba 16