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<p>Dear all,</p>
<p>this is the blue-jeans link to remotely attend the Theory
Seminar: <a class="moz-txt-link-freetext" href="https://bluejeans.com/664937788">https://bluejeans.com/664937788</a><br>
Regards,</p>
<p> Alessandro, Andrea, Bipasha<br>
</p>
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<div>Theory Center Seminar<br>
Monday, Dec. 11, 2017<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L102<br>
<font color="#0f61c8"><br>
</font>Daniel Pitonyak (PSU Berks)<br>
<font color="#0f61c8"><br>
</font><b>Transversely polarized collinear and TMD observables
within the Collins-Soper-Sterman formalism</b><br>
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<div>We use the framework of the Collins-Soper-Sterman (CSS)
formalism to discuss transversely polarized collinear and
TMD observables, where we focus on the Sivers effect in
SIDIS. Using an improved version of the CSS framework, we
are able to re-derive at leading order the well-known
relation between the (TMD) Sivers function and the
(collinear twist-3) Qiu-Sterman function. We discuss the
physical interpretation of this identity in terms of the
average transverse momentum of unpolarized quarks in a
transversely polarized spin-1/2 target. We also show how it
is collinear twist-3 functions that drive all collinear and
TMD transverse-spin effects. </div>
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