Speaker
Daniel Adamiak
(Ohio State University)
Description
In order to solve the proton spin problem, the small-$x$ asymptotics of the helicity parton distribution functions (hPDFs) need to be understood. New theory has been developed for the small-$x$ evolution of these hPDFs, able to extrapolate the small-$x$ behaviour of the quark and gluon hPDFs. At large $N_c \& N_f$, these evolution equations close and are amenable to numerical computation. In this talk we will present the phenomenological analysis of this theory by describing the world data on the $g_1$ structure function within the JAM global analysis framework. Beyond this, we investigate the qualitative behaviour of the quark and gluon hPDFs and the challenges involved with measuring them.
Primary authors
Andrey Tarasov
(The Ohio State University)
Daniel Adamiak
(Ohio State University)
Dr
Daniel Pitonyak
(Lebanon Valley College)
Dr
Matt Sievert
(NMSU)
Mr
Nick Baldonado
(NMSU)
Dr
Nobuo Sato
(Jefferson Lab)
Dr
Wally Melnitchouk
(Jefferson Lab)
Yossathorn Tawabutr
(The Ohio State University)
Yuri Kovchegov
(The Ohio State University)
