Seq. Number (TBA   )
Research Plan at RIKEN CC-J
                                 Date: 08/04/09 (DD/MM/YY)

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

Reseach Subject : Virtual photon measurement in p+p and d+Au collisions

(PHENIX official or not : no )

Person responsible for this reserch:
Name : Yorito Yamaguchi
Tel/Fax : 048-464-4285/048-464-4554
E-mail : yorito@cns.s.u-tokyo.ac.jp

Person responsible for the job submission:
Name : Yorito Yamaguchi
Tel/Fax : 048-464-4285/048-464-4554
E-mail : yorito@cns.s.u-tokyo.ac.jp


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


Summary of this research (10-100 lines)

Measurement of direct photons in low pT region are one of the most important 
measurements to investigate the properties of QGP since primary contributors 
in this region are considered to be photons by thermal emission in QGP phase 
and can carry the thermodynamical information of QGP directly.

A measurement of e+e- pairs from virtual direct photon decays is suitable to 
measure such low pT direct photons. The results in p+p and d+Au collisions 
are absolutely important in order to extract a net thermal photon contribution 
in Au+Au result. Photons from QCD process are evaluated using p+p result and 
nuclear effects such as Cronin effect and shadowing and an effect from a parton 
distribution function in Au nucleus are evaluated using d+Au result.



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

Estimated disk space usage required :     500 GB 
 

Estimated HPSS space usage required :

HPSS band width for above estimate  :       MB/s


Target date for completion (cpu) :   -    (DD/MM/YY)
                           (disk):   31/03   /2010  









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