CPOD International Workshop at GSI Darmstadt
July 9 - 13, 2007 -
Registered Participants Information

Title:	Mr.
Last Name:	Nakamiya
First Name:	Yoshihide
E-Mail:	nakamiyahepl.hiroshima-u.ac.jp
Affiliation for Badge:	Hiroshima University
Institute:	Graduate School of Science, Hiroshima University
Address (Street):	Kagamiyama 1-3-1 Higashi-Hiroshima, Hiroshima
Postal Code, City:	739-8526
Country:	Japan
Phone:	81+82+424+7370
Fax:	81+82+424+0717
Arrival Date:	July 8
Departure Date:	July 13
Hotel Information:	GSI Guesthouse and Hostel
Payment:	Cash at the conference site
Contribution
Author(s):	Yoshihide Nakamiya for the PHENIX Collaboration
Institute(s):	Graduate School of Science, Hiroshima University
Title:	Light vector mesons in PHENIX
Abstract:	High energy heavy-ion collisions allow investigation of strongly interaction matter governed by the partonic degree of freedom at high energy density. Near the phase transition between normal nuclear matter and deconfined partonic matter, it is expected that the mass, lifetime and branching ratio of light vector mesons change due to the partial restoration of chiral symmetry. Electromagnetic probes, such as leptons and photons, are clean keys to research the properties of the created partonic matter, as they exit in the medium with less interaction due to their electromagnetic coupling. Measurements of light vector mesons via leptonic decay probe the properties, particularly when combined with observation of the corresponding hadoronic decay channels. The PHENIX experiment at RHIC is uniquely suitable for this study, because the PHENIX spectrometers are versatile detectors with excellent capabilities to measure electrons and photons as well as hadrons in a large dynamic range. PHENIX has measured $\phi$ $\rightarrow$ $e^-e^+$, $K^+K^-$ and $\omega$ $\rightarrow$ $e^-e^+$, $\pi^0\gamma$ and $\pi^0\pi^+\pi^-$ at various collision systems from proton+proton to Au+Au collisions at a broad range of collision energies. In this talk, we will present latest results of systematic measurements, mainly mention electromagnetic probes, for light vector mesons at various collision systems up to $\sqrt{s_{NN}}$ = 200 GeV.