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Meson Production in Heavy Ion Collisions at RHIC

SHI Xing-hua CHEN Jin-hui MA Yu-gang CAI Xiang-zhou MA Guo-liang

SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. 原子核物理评论, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
引用本文: SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. 原子核物理评论, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. Nuclear Physics Review, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
Citation: SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. Nuclear Physics Review, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142

Meson Production in Heavy Ion Collisions at RHIC

doi: 10.11804/NuclPhysRev.26.S1.142
详细信息
    通讯作者: SHI Xing-hua

Meson Production in Heavy Ion Collisions at RHIC

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    Corresponding author: SHI Xing-hua
  • 摘要: We present  meson production in Cu+Cu and Au+Au collisions measured by the STAR experiment at RHIC.The hadronic decay mode → K+K-is used in the analysis.The yields for  meson in Cu+Cu and Au+Au collisions at a given beam energy are scaled by the number of participant.The Npart normalized  meson yields in heavy ion collisions over those from p+p collisions are larger than 1 and increase with collision energy.These results suggest that the source of enhancement of strange hadrons is related to the formation of a dense medium in high energy heavy ion collisions and can not be only due to canonical suppression of their production in smaller systems.We also present STAR results on the  meson elliptic flow v2 from sNN=200 GeV Cu+Cu at RHIC.The elliptic flow in Cu+Cu system that has the similar relative magnitude and qualitative features as that in Au+Au system.The observations imply the hot and dense matter with partonic collectivity has been formed in heavy ion collisions at RHIC. However, eccentrality normalized v2, v2/(nqεpart) is lower for Cu+Cu than for Au+Au collisions at 200 GeV.So this might indicate thermalization has not been reached in 200 GeV Cu+Cu collisions.
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出版历程
  • 收稿日期:  1900-01-01
  • 修回日期:  1900-01-01
  • 刊出日期:  2009-07-20

Meson Production in Heavy Ion Collisions at RHIC

doi: 10.11804/NuclPhysRev.26.S1.142
    通讯作者: SHI Xing-hua

摘要: We present  meson production in Cu+Cu and Au+Au collisions measured by the STAR experiment at RHIC.The hadronic decay mode → K+K-is used in the analysis.The yields for  meson in Cu+Cu and Au+Au collisions at a given beam energy are scaled by the number of participant.The Npart normalized  meson yields in heavy ion collisions over those from p+p collisions are larger than 1 and increase with collision energy.These results suggest that the source of enhancement of strange hadrons is related to the formation of a dense medium in high energy heavy ion collisions and can not be only due to canonical suppression of their production in smaller systems.We also present STAR results on the  meson elliptic flow v2 from sNN=200 GeV Cu+Cu at RHIC.The elliptic flow in Cu+Cu system that has the similar relative magnitude and qualitative features as that in Au+Au system.The observations imply the hot and dense matter with partonic collectivity has been formed in heavy ion collisions at RHIC. However, eccentrality normalized v2, v2/(nqεpart) is lower for Cu+Cu than for Au+Au collisions at 200 GeV.So this might indicate thermalization has not been reached in 200 GeV Cu+Cu collisions.

English Abstract

SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. 原子核物理评论, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
引用本文: SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. 原子核物理评论, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. Nuclear Physics Review, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142
Citation: SHI Xing-hua, CHEN Jin-hui, MA Yu-gang, CAI Xiang-zhou, MA Guo-liang. Meson Production in Heavy Ion Collisions at RHIC[J]. Nuclear Physics Review, 2009, 26(5): 142-147. doi: 10.11804/NuclPhysRev.26.S1.142

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