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<b><font color="#3333ff">Seminar<br>
Wed., April 11, 2012<br>
11:00AM<br>
CEBAF Center Auditorium</font></b><font
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<br>
<br>
<b><font color="#990000">"Constraining Quark Transversity through
Collins<br>
Asymmetry Measurements in Polarized pp<br>
Collisions at STAR"<br>
<br>
Robert Fersch<br>
University of Kentucky</font></b><br>
<br>
Abstract:<br>
<br>
Quantifying the transverse spin structure of the proton is of fundamen-<br>
tal importance to its complete description in a collinear partonic
frame-<br>
work, yet transversity remains poorly constrained relative to other fun-<br>
damental degrees of freedom. The required “Collins-Sivers separation”<br>
of transversity-dependent and Transverse Momentum-Dependent (TMD)<br>
terms can be achieved through the measurement of pion asymmetries<br>
within reconstructed jets about their momentum axes in pp collisions.<br>
The Solenoidal Tracker at RHIC (STAR) provides reconstruction of jets<br>
and charged pion tracking at √s=200 GeV, allowing for measurement of<br>
the Collins Asymmetry for quark momentum fraction hxi ≈ 0.2 to con-<br>
tribute to a global analysis of transverse degrees of freedom in the
proton.<br>
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