Overview of flow results from ALICE experiment

Transcription

1 Overview of flow results from ALICE experiment ShinIchi Esumi for the ALICE collaboration Inst. of Physics, Univ. of Tsukuba contents Multiplicity and transverse momentum distribution Source size measurement from HBT Elliptic and higher order collective flow Correlation and higher p T CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 1

2 PID TPC V0 T0 ZDC A.Toia, QM11 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 2

3 Multiplicity in A+A at the highest possible energy PRL105, (2010) factor of ~2 increase with similar N part dependence CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 3

4 Identified particle p T distribution collective expansion locally thermal positive hadrons negative hadrons M.Floris, QM11 larger p T shift for heavier particles larger radial flow than in this hydro model CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 4

5 k T dependence of HBT radii --- from extended and expanding source --- static source expanding source ~1/R higher p T CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 5

6 Beam energy dependence of 3D source size factor of ~2 increase in source volume CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 6

7 Elliptic flow (elliptic event anisotropy) : v 2 lower p T x z Reaction plane Hydro-dynamical expansion higher p T larger energy loss by long path length reaction plane smaller energy loss by short path length 2 nd harmonic amplitude of azimuthal distribution with respect to the reaction plane Φ 2 : v 2 φ i track - Φ n event CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 7

8 v 2 (p T ), <v 2 > comparison between RHIC and LHC PRL similar hydro properties <v 2 > still increases with <p T > CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 8

9 Identified particle v 2 and (m T -m 0 )/n quark scaling --- including strangeness/heavy baryons --- remaining mass ordering from stronger radial flow R. Snellings, QNP12 Scaling does not work as good as at RHIC CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 9

10 Small deviations in (m T -m 0 )/n q scaled v 2 Pb+Pb 2.76TeV Au+Au 200GeV Au+Au 39GeV 40-45% proton proton PHENIX Preliminary PHENIX Preliminary M. Krzewicki, QM11 J. Phys. G38, (2011) roughly (m T -m 0 )/n q scaled for all energies larger p T shift for heavier particles radial flow increases with energy CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 10

11 Initial geometrical fluctuation & Higher harmonic anisotropy v n B.Alver, G.Roland S. Jeon PRL CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 11

12 Identified particle v 3 n q scaling hydro M. Krzewicki, QM11 J. Phys. G38, (2011) hydro : similar mass-splitting at lower p T n q scaling : similar Baryon / Meson difference at higher p T The KE T /n q scaling for v 3 is also not as good as for v 2 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 12

13 2-part. correlation in Δφ vs Δη --- another way to measure v n and to describe ridge and mach-cone --- Pb-Pb 2.76TeV, 2~3GeV/c, J. Jia (ATLAS), QM11 A. Adare, QM11 arxiv: CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 13

14 2-particle azimuthal correlation function --- flow un-subtracted C PRL PLB rapidity separated C 2 is well described by v 2,3,4,5 as naturally expected because of v n {2, Δη >1} The small deviation gives the soft-hard interplay CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 14

15 v n and R AA at low/mid/high p T region arxiv: H. Appleshauser, QM11 v n at high p T from suppression dominance given by path length transition from low(soft) to high(hard) p T region CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 15

16 Summary and outlook TeV Pb+Pb collisions at LHC-ALICE - factor of 2 in charged particle multiplicity dn ch /dη - factor of 2 in freeze-out volume from HBT - increased and pronounced radial flow - similar hydro properties compared with RHIC - initial fluctuation and expansion drive the v n - soft-hard interplay CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 16

17 Identified particle v 2 hydro (arxiv: ) hydro (arxiv: ) M. Krzewicki, QM11 larger mass-splitting + familiar Baryon/Meson difference larger radial flow in central collisions than in this hydro model CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 17

18 S. Jeon Initial geometrical fluctuation & Higher harmonic anisotropy v n arxiv: PRL CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 18

19 B.Alver, G.Roland G. Qin, H. Petersen, S. Bass, and B. Muller Fluctuation of v indirect measurement via v 2 {2} and v 2 {4} difference --- R. Snellings, QNP12 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 19

20 Variation of v n results with different p T range for the global fit PLB CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 20

21 v n {C 2 global fit} ~ v n {2, Δη >1} A. Adare, QM11 good agreement of v n even towards higher p T coming from (low x high) p T combinations in C 2 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 21

22 Possible charge asymmetry signal from Local Parity Violation S. A. Voloshin, Phys. Rev. C 70, (2004). STAR Collaboration: Phys. Rev. Lett. 81, (2009) STAR Collaboration: Phys. Rev. C81, (2010) P. Christakoglou, QM11 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 22

23 p T dependence of the observed asymmetry signal P. Christakoglou, QM11 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 23

24 B. Wyslouch (CMS), QM11 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 24

25 J. Jia (ATLAS), QM11 CIPANP2012, 2/Jun/2012, St. Petersburg, Florida, USA Univ. of Tsukuba, ShinIchi Esumi 25