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<p>Theory Center Seminar<br>
Wed., March 1, 2017<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L102<br>
<br>
Nobuo Sato <br>
University of Connecticut/JLab<br>
<br>
<b>The Quest to Unveil Partonic Degrees of Freedom in Hadrons
Using High Energy Reactions </b><br>
<br>
Over the last thirty years, significant progress has been made in
characterizing the longitudinal momentum distribution<br>
of quarks and gluons inside hadrons known as Parton distribution
functions (PDFs). These play a key role at facilities <br>
such as the LHC in connection with the discovery of the Higgs
boson, as well as constraints on physics beyond the<br>
standard model. Similarly, formation of hadrons from highly
energetic final state quarks and gluons can be characterized <br>
in terms of fragmentation functions (FF), which encode the
distribution of longitudinal momentum fractions that hadrons<br>
carry from their parent quarks or gluons. At present, PDFs and FFs
are not calculable from first principles but instead they<br>
are extracted from experimental cross sections, and several groups
are actively performing such analyses around the world. <br>
The next step is to resolve the transverse momentum dependent
distributions (TMD) for both PDFs and FFs which is one the<br>
central tasks in the upcoming measurements at Jefferson Lab and
the future Electron Ion Collider. In this talk, I will discuss <br>
the challenges in an ongoing research program that involves theory
and experimental efforts aimed towards the most <br>
comprehensive analysis of nucleon structure ever undertaken. </p>
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