Seq. Number (TBA )
Research Plan at RIKEN CC-J
Date: 08/10/08 (DD/MM/YY)

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

Reseach Subject : Simulation for J/psi spin alignment study

(PHENIX official or not : no )

Person responsible for this reserch:
Name : Kohei Shoji
Tel/Fax : +1-631-344-8087
E-mail : shoji@scphys.kyoto-u.ac.jp

Person responsible for the job submission:
Name : Kohei Shoji
Tel/Fax : +1-631-344-8087
E-mail : shoji@scphys.kyoto-u.ac.jp

Other collabrators in this research subject:
Name : Yuji Goto
tel/Fax: +1-631-344-2735
E-mai: goto@bnl.gov

Summary of this research (10-100 lines)
J/psi production cross section is well explained by Color Octet Model (COM).
But its spin alignment is still a puzzle of J/psi production mechanism.
So far, CDF and NA60 experiments measured J/psi polarization
( Phys.Rev.Lett.99,132001(2007), J.Phys.G34:S463-470,2007 )
and, for example, CDF shows slightly negative polarization
while COM predicts a positive polarization.
So measurements of J/psi polarization and provides new data are important
to understand the J/psi production mechanism.
In PHENIX experiment, J/psi is detected by Muon Arm via muon decay channel
or by Central Arm via electron decay channel.
Acceptance corrections are very important to analyze the J/psi
polarization for both cases.
I will do Muon Arm simulations using CCJ for the acceptance corrections
and get the J/psi polarization from run6 proton-proton collision data.

Estimated CPU time required : 5000 hours (with Pentium III 1GHz)

Estimated disk space usage required : 200GB

Estimated HPSS space usage required :
HPSS band width for above estimate : MB/s

Target date for completion (cpu) : 09/09/30 (DD/MM/YY)
(disk): 09/09/30

Plan for the publication of this result (if possible)

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