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Talker: Dr. Mickey Chiu (University of Illinois)
Title: "Sivers Measurement Using Back to Back di-Hadrons"
Schedule: 2005 July 11th(Mon.) 14:00 --
	  in RIKEN Main Bldg. 2F Seminar Room

Abstract:
The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab 
is a truly uniquely flexible collider, capable of colliding a wide range 
of heavy ion species as well as longitudinally and transversely polarized 
protons.  Thus, besides the program of Heavy Ion Physics, there is a 
rich Spin Physics program which vastly expands the space of QCD 
phenomena which can be explored at RHIC.  In particular, large
non-zero single spin asymmetries have been measured at RHIC and might 
provide access to a deeper understanding of nucleon structure, such as 
the orbital angular momentum of partons.  Currently, these large 
asymmetries are thought to come either from higher-twist contributions, 
modifications to the parton distribution functions (Sivers), 
modifications to the fragmentation functions (Collins), or even perhaps 
some combination of the three. Future progress will require separating 
these effects.  We discuss future prospects with the PHENIX detector
for reducing these ambiguities in inclusive single spin asymmetries by 
looking at correlations between hadrons from the same and from back to 
back jets.


Host researcher : K. Tanida


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         Contact persons of Nuclear Physics Seminar
          T. Haseyama and D. Kameda (Applied Nucl. Phys. Lab.)
          (email) seminar@rarfaxp.riken.go.jp 
          (FAX)   048-462-4645
          (WWW)   http://rarfaxp.riken.go.jp/~seminar/    
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