To: the Planning and Coordination Office of RIKEN CC-J
Date:21/08/2002
Research Subject:Alignment study using Cosmic Ray

Person responsible for this research:
Name: Nobuyuki Kamihara
Tel/Fax: +1-631-344-8088
E-mail: kamihara@bnl.gov

Other collaborators in this research subject:
Name: Atuchi Taketani
Tel/Fax: +1-631-344-3838
E-mail: taketani@bnl.gov

Summary of this research
 
In the latest alignment constant using only zero 
field off data for the south muon arm, there is 
rotation ambiguity. This reason is due to low statistics.
This ambiguity value is max 460 micron. This value 
is not good for J/psi mass resolution.

In order to obtain more good J/psi mass resolution,
It is important to obtain more the statistics.

This research using the zero field Cosmic Ray data will 
reduce the rotation ambiguity and will obtain more
J/psi mass resolution.