| Where we are & Where to go |
| For PHENIX Collaboration | |
| Yasuo Miake, Univ. of Tsukuba |
| First Collision at PHENIX |
| Machine started on March, 2000 | |
| First Collisions at PHENIX recorded on June 15th, 2000 | |
| 5 Million Collisions Recorded till September, 2000 |
| Multiplicity Distribution |
| Multiplicity measurement by Drift & Pad chamber | ||||
| Consistent Results | ||||
| Shape of distr. well explained by Glauber Model Calculation | ||||
| Central collisions (Upper 6%) ;^ΕTSO | ||||
| <Nparticipant>~345 from Glauber | ||||
| Central Pb+Pb at SPSiγ17.2 GeV/Aj^ΕSOO | ||||
| SO increase !! | ||||
| Transverse Energy Distribution |
| Transverse Energy by EM Cal. | ||||
| Glauber ModelΙζθͺz`σΜΰΎΒ | ||||
| Central Collisions (Upper 2%);ds^ΕTVOf u | ||||
| Central Pb+Pb at SPSiγ17.2 GeV/Ajds^ΕSOTf u | ||||
| SO increase !! | ||||
| Estimate of energy density by Bjorken Formula; | ||||
| Compared with SPS, >40% increase! | ||||
| More comparison |
| Charged Multiplicity, ET shows ~40% increase | |||
| ~50% increase if normalized with # of participants | |||
| ET/Multiplicity ratio increases slightly | |||
| qghbGids^Εj^i^Ε j`PDOT | |||
| ror@Gids^Εj^i^Ε j`PDO | |||
| Slight increase of individual pt | |||
| ΞO measurement by EM Cal. |
| Photons of ΞO¨QΑ detected | ||
| Evaluate invariant mass of all photon pair | ||
| Subtract Combinatorial Background with a Mixed Event Method | ||
| @pT distribution |
| Compared with CERN WA98 results | ||
| Hotter(!?) at RHIC | ||
| Tracking Results | ||
| Agree with in the error | ||
| PID by TOF |
| No Slewing, No adj. W. tracking | |||
| Intrinsic Resolution of 120 ps | |||
| TOF resolution of 170 ps | |||
| Has been improved to | |||
| TOF resolution of 120 ps aft. Slewing | |||
| A. Kiyomichi/T. Chujo | |||
| Capability of a lot of physics! | |||
| Particle ratios ; Chemical eq. | |||
| Y. Kwon/DJ.Kim | |||
| @pT distribution of Identified |
| Capability of a lot of physics! | |||
| strangeness and (net)baryon content Þ ΚS, ΚB | |||
| mean pT, variation of invariant cross section with pT Þ T | |||
| pT as function of particle species - evidence for collective motion? Þ b | |||
| Cross section for short-lived particles, such as w and f vector mesons | |||
| Need works on Tracking, Acceptance | |||
| T. Chujo | |||
| Higher pt | |||
| S. Sato | |||
| Elliptic Flow @ Phenix |
| iΣP-Σ2jdistribution made for all the pair | |||
| Then, normalized with Mixed Events | |||
| QQ | |||
| Beam Energy Dependence of uQ |
| No structure observed | ||||
| a) No phase Transition? | ||||
| b) No sensitivity for the signal of phase transition? | ||||
| c) Bad gSystematich comparison? | ||||
| Such as, | ||||
| protons vs pions | ||||
| pt, rapidity regions | ||||
| Need gsystematich measurements! | ||||
| Goal(1);Particle Ratios |
| Chemical Eq. In RHIC Collisions? | ||
| @Αs; Eq. in Strangeness also? | ||
| Strangeness Enhancement? | ||
| Larger enhancement for multi-strangeness? | ||
| Temperature of chemical freezeout? | ||
| Larger than 170 MeV? | ||
| Goal(2); pT distribution |
| Slope parameters vs mass | ||
| Freezeout Temepature | ||
| Radial flow velocity | ||
| Systematic Comparison | ||
| Where it goesc |