Φ Meson Production in Heavy Ion Collisions at RHIC
We present Φ meson production in Cu+Cu and Au+Au collisions measured by the STAR experiment at RHIC.The hadronic decay mode Φ→K+K- is used in the analysis.The yields for Φ meson in Cu+Cu and Au+Au collisions at a given beam energy are scaled by the number of participant.The Npart normalized Φ 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 Φ meson elliptic flow υ2 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 υ2,υ2/(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.
Φ meson production elliptic flow
SHI Xiag-hua CHEN Jin-hui MA Yu-gang CAI Xiang-zhou MA Guo-liang
Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Graduate Sch Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China
国际会议
3rd China-Japan-Korea Hadron and Nuclear Physics 2008 Symposium(第三届中日韩强子物理与核物理研讨会)
兰州
英文
142-147
2008-06-23（万方平台首次上网日期，不代表论文的发表时间）