| DATE: |
2005-09-09 14:00 - |
| PLACE: |
Kenkyu-Honkan 3F, RM 321 |
| TITLE: |
Diquark fragmention model of baryon production in ultrarelativistic nucleus-nucleus collisions |
| CONTACT: |
Tango |
| SPEAKER: |
Dr. Kosuke Terasaki (University of Tokyo) |
| LANGUAGE: |
Japanese |
| ABSTRACT: |
Quark recombination model has been proposed to explain anomalous production of baryons with transverse momenta of a few GeV/c observed in Au+Au collisions at RHIC. The model explains the enhancement of baryon/meson ratio as well as the valence quark-number scaling of the eliptic flow. The recent RHIC data shows, however, jet-like correlations of associate hadron production in transverse momentum range of 2 to 5 GeV/c, the feature which may be more naturally explained by the quark fragmentation model. There have been recent attempts to describe such behaviors through the influence of medium partons on energetic parton. However they did not give a quantitative desription of how correlations in the parton phase arise. We think that one of the key to solving the puzzle is color-multiplet states, which has been neglected in original Quark recombination model. In this work, we study a new hybrid mechanism of baryon production which involves (color anti-triplet) diquark formation by recombination of a pair of thermal quarks and its subsequent fragmentation into "diquark-jet". This model, which we call "diquark fragmentation model", incorporates two desirable features of the recombination model and the quark fragmentation model. |
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