[Jlab-seminars] Theory Center Seminar (Corrected Version)

[Mary Fox]

Theory Center Seminar
Monday, Jan. 14, 2013
CEBAF Center, L102
1:00 p.m. (coffee at 12:45 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.