Study of pT suppression and thermal properties of QGP with the ALICE experiment in Pb-Pb collisions at LHC

2014 Fiscal Year Final Research Report

• Project/Area Number: 23244055
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hiroshima University
• Principal Investigator: SUGITATE TORU 広島大学, 理学(系)研究科(研究院), 教授 (80144806)
• Co-Investigator(Kenkyū-buntansha): SHIGAKI Kenta 広島大学, 大学院理学研究科, 准教授 (70354743) ; HOMMA Kensuke 広島大学, 大学院理学研究科, 助教 (40304399)
• Co-Investigator(Renkei-kenkyūsha): MIAKE Yasuo 筑波大学, 大学院数理物質科学研究科, 教授 (10157422) ; HAMAGAKI Hideki 東京大学, 大学院理学系研究科, 教授 (90114610) ; MIYOSHI Takahiro 広島大学, 大学院理学研究科, 助教 (60335700)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: クォーク物質 / フォトン物理 / ALICE実験 / クォークグルーオンプラズマ / QGP

Outline of Final Research Achievements

We have accumulated high-qualified experimental data in lead-on-lead and proton-on-lead collisions as well as in high-statistic pp reactions, and successfully completed the RUN-1 program at LHC. Studies of high pT suppression with identified neutral pions measured by our PHOS detector have been preceded first, and the results in the new domain have been published. In another subject revealing thermo-statistical properties of QGP created at the LHC, we have attained a remarkable progress observing a significant amount of thermal-radiation-like-photons piled up on a perturbative QCD single photon spectrum in the central lead-on-lead collisions. We consider this indicates extraordinary ability of our PHOS detector built for precise photon physics. The matter created at the LHC seems to be a perfect quantum fluid heated beyond the Hagedorn temperature up to around 300 MeV or 3.5 trillion Celsius degrees.

Free Research Field

数物系科学