[Theory-seminars] Theory Seminar today (reminder)

[Alvaro Calle Cordon]

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
reactions.

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