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Theory Center Seminar<br>
Monday, January 14, 2013<br>
CEBAF Center, L102<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
<br>
<br>
Daniel Pitonyak<br>
Temple University<br>
<br>
<b>Photon Fusion Reactions in a Dispersive Effective Field Theory
(DFT)<br>
From the Chiral Lagrangian with Vector Meson Fields <br>
</b><br>
Experimental data has recently become available on the transverse
target single-spin<br>
asymmetry (SSA) for inclusive DIS. I will present analytical and
numerical results for this<br>
observable, which also have implications for the current extractions
of the Qiu-Sterman <br>
function T_F(x,x) that arises in transverse SSAs from pp collisions.
Possible resolutions <br>
to the so-called "sign-mismatch" crisis including a new calculation
of the fragmentation<br>
contribution to the transverse SSA in pp collisions will also be
explored. Moreover, <br>
extensive work has been done on the leading-twist (twist-2)
double-longitudinal spin <br>
asymmetry A_LL. Here I will focus on the analysis of the
longitudinal-transverse spin<br>
asymmetry A_LT for photon, hadron, and jet production from pp
collisions. Furthermore,<br>
I will discuss how this observable could give insight into both the
A_LL and transverse <br>
SSA domains.
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