[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Wednesday, Jan. 16, 2013
CEBAF Center, L102
3:00 p.m. (coffee at 2:45 p.m.)


Daniel Pitonyak
Temple University

*Single- and Double-Spin Asymmetries in Hard Scattering Processes*

Experimental data has recently become available on the transverse target
single-spin asymmetry (SSA) for inclusive DIS. I will present analytical
and numerical results for this observable, which also have implications
for the current extractions of the Qiu-Sterman function T_F(x,x) that arises
in transverse SSAs from pp collisions. Possible resolutions to the so-called
"sign-mismatch" crisis including a new calculation of the fragmentation
contribution to the transverse SSA in pp collisions will also be explored.
Moreover, extensive work has been done on the leading-twist (twist-2)
double-longitudinal spin asymmetry A_LL. Here I will focus on the analysis
of the longitudinal-transverse spin asymmetry A_LT for photon, hadron, and jet
production from pp collisions. Furthermore, I will discuss how this observable
could give insight into both the A_LL and transverse SSA domains.

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