Research Plan at RIKEN CC-J 
				          Date: 10/08/04 (DD/MM/YY)

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

Reseach Subject : Simulation study for the measurement of the neutral hadrons in Au-Au collisions at RHIC-PHENIX

(PHENIX official or not :        no )

Person responsible for this reserch:
Name : Tadaaki Isobe
Tel/Fax : tel: +81-48-464-4156, fax: +81-48-464-4554
E-mail : isobe@cns.s.u-tokyo.ac.jp

Person responsible for the job submission:
Name : Tadaaki Isobe
Tel/Fax : tel: +81-48-464-4156, fax: +81-48-464-4554
E-mail : isobe@cns.s.u-tokyo.ac.jp


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

Summary of this research (10-100 lines)

One of the most intriguing observations at RHIC is 
the suppression of high transverse momenta pT neutral pions in central
Au+Au collisions compared to the yield in p+p collision scaled by
number of collision.
Measurement of the neutral mesons allows us to study the modifications
of hard scattering processes for each kind of particles in the QCD medium
produced in nucleus-nucleus collisions.
The measurement is also essential for the measurement of direct
photons, because they constitute the large background photons.

For this analysis, I plan to calculate the gamma and neutral meson 
efficiency correction, and evaluate the results.
And I'll use CC-J for this calculation, and understanding of the
systematic error.

I'd like to calculate the correction with original event generator
which is based on the PHENIX results and can generate the event 
of RHIC.
The PISA output is reconstructed with PHENIX official reconstruction
tool and used for the efficiency calculation.

Estimated CPU time required : ~50000 hours (with Pentium III 1GHz)
  

Estimated disk space usage required : 1000 GB
 50KByte(1event)*2M(event)*10(centrality) ~= 1000GByte: DST

Estimated HPSS space usage required : 1000 GB

HPSS band width for above estimate  :    1  MB/s


Target date for completion : 30 / 11 / 04 (DD/MM/YY)


Plan for the publication of this result (if possible)