[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, Oct. 17, 2011
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room F224/F225

*Process Dependent Sivers Function and Implications for Single 
Spin Asymmetry in Inclusive Hadron Production*

Leonard Gamberg
Penn State University Berks

We will consider single transverse spin asymmetries in the inclusive 
particle production within the framework of the generalized parton model 
(GPM). By carefully analyzing the initial- and final-state interactions, 
we include the process-dependence of the Sivers functions into the GPM 
formalism. Within this formalism, we make predictions for single 
inclusive pion and direct photon production at RHIC energies.
Also we consider the azimuthal distribution of leading pions inside a 
fragmenting jet as well as single inclusive jet asymmetry in polarized 
proton--proton collisions. In contrast to single inclusive pion 
production, we can isolate the Sivers contribution and thereby study its 
process dependence. However, in all cases, we find the predictions are 
comparable in size but opposite to those in the conventional GPM 
approach. We conclude that these processes represent unique 
opportunities to discriminate among the two approaches and test the 
universality properties of the Sivers function in hadronic scattering 

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