[Jlab-seminars] Physics Seminar (W&M), Tuesday, May 12, 2:00 p.m., Small Hall 122

[Mary Fox]

*PHYSICS SEMINAR*
Tuesday, May 13, 2014
2:00 PM
Small Hall, Room 122

*Boris Ermolaev *[Host: André Walker-Loud]
Ioffe Physical Technical Institute, St. Petersburg, Russia

Title of Talk:
*/"Description of the Spin Structure Function g1 at Arbitrary x and Q2"/*

*Abstract:*
The standard theoretical description of polarized DIS is based on the 
use of the DGLAP evolution equations. This approach is theoretically 
grounded for the hard kinematics of large x and large Q2. It controls 
the Q2 -evolution but cannot account for the x -evolution. Instead, it 
mimics the x -evolution by ad hoc inserting singular factors x^-a in 
parton distributions without any theoretical grounds. Resummation of the 
leading logarithmic contributions and merging it with DGLAPP allowed us 
to describe g1 at arbitrary x and drop the singular factors at the same 
time. Then, independently of values of x, the region of small Q2 is also 
out of the reach of DGLAP. We suggest a simple way to extrapolate DGLAP 
into the small-Q2 region at any x, arriving thereby at description of g1 
at arbitrary x and Q2.
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