Seq. Number (TBA   )
Research Plan at RIKEN CC-J 
		                 Date: 18/08/06

To: the Planning and Coordination Office of RIKEN CC-J

Reseach Subject : Simulation study for vector meson measurement with RUN-5 Cu+Cu data

(PHENIX official or not :  no)

Person responsible for this reserch:
Name : Susumu Oda
Tel/Fax : 
+81-48-464-4408/+81-58-464-4554
+1-631-344-7801/+1-631-344-7158          
E-mail : oda@cns.s.ut-tokyo.ac.jp

Person responsible for the job submission:
Name : Susumu Oda
Tel/Fax : 
+81-48-464-4408/+81-58-464-4554
+1-631-344-7801/+1-631-344-7158          
E-mail : oda@cns.s.ut-tokyo.ac.jp

Other collabrators in this research subject:
Name :
tel/Fax:
E-mai:
  

Summary of this research (10-100 lines)
Measurement of vector mesons via di-lepton decay is a sensitive probe for
the hot and dense matter created by relativistic heavy ion collisions.
Heavy ion data from RHIC so far are confined to measurements of $J/\psi$
production. Models of $J/\psi$ production in heavy ion collisions
at RHIC contain a number of important competing effects, including
reduction of initial $J/\psi$ yields due to cold nuclear matter effects,
reduced feed down from excited charmonium states that melt just above the
QGP transition temperature, destruction of $J/\psi$ due to interactions
with thermal gluons in the GQP, and coalescence of uncorrelated charm
pairs. Systematic studies of $J/\psi$ production in heavy ion collisions
with several system sizes and energy densities are important for
understanding the behavior of $J/\psi$ in hot and dense nuclear matter.
The light vector mesons ($\rho$, $\omega$ and $phi$) are expected to 
be sensitive to possible in-medium modifications by chiral symmetry 
restoration. 

The PHENIX experiment collected 1 billion events in Cu+Cu collisions
in 2005 (RUN-5). About 1,000 $J/psi$ mesons and 1,000 $phi$ mesons 
were collected in the di-electron channel in the RUN-5. Analysis of those 
mesons are on going. 

One of the most important issue to measure the yields of those vector 
mesons is the acceptance calculation. 10 million simulation events will 
be produced and analyzed at CC-J to obtain systematic and statistical 
errors of less than 5%.   


Estimated CPU time required : 10000 hours (with Pentium III 1GHz)
  
Estimated disk space usage required : 200 GB
 
Estimated HPSS space usage required : 0 GB

HPSS band width for above estimate  :     0 MB/s

Target date for completion (cpu) :  31/03/07
                           (disk):  31/03/07 

Plan for the publication of this result (if possible)

Other useful infomation