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<tt>Theory Center Seminar<br>
Fri., May 18, 2012<br>
CEBAF Center, Room F326/327<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
<br>
<br>
<b>High-Energy QCD Factorization in DIS and pA Collisions </b><br>
<br>
Giovanni A. Chirilli <br>
Lawrence Berkeley National Laboratory <br>
<br>
In pA collisions for single-inclusive hadron production, the
proton,<br>
treated as a diluted system, emits a quark or a gluon that
eventually<br>
scatters off a dense target like a large nucleus. In this process,
the<br>
collinear factorization and the high-energy rapidity factorization
enter<br>
on the same footing. It is then important to show that these two
types <br>
of divergences indeed factorize. We show that, at one-loop order,
the <br>
collinear divergences of the incoming parton distribution
functions of<br>
the nucleon and of the outgoing fragmentation functions of the
final state<br>
hadron factorize from the rapidity divergence of the small-x
dipole gluon<br>
distribution of the nucleus: the collinear divergences produce the
DGLAP <br>
evolution equations for parton distribution and fragmentation
functions, <br>
while the rapidity divergence produce the Balitsky-Kovchegov
equation for<br>
the dipole gluon distribution of the nucleus. <br>
<br>
<br>
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