Speaker: Alberto Accardi (Jeffferson Lab)
Title: Collinear factorization for DIS at large Bjorken x
Abstract:
I consider the computation of the proton structure functions in the
large Bjorken xB regime in the framework of collinear factorization.
Explicit target mass corrections (TMC) are included at leading twist,
and shown to not violate the xB<1 kinematic limit as in previous
calculations.
Compared to the well known Georgi-Politzer TMC, I obtain similar F1
and F2 structure functions, but a much smaller correction to the
longitudinal structure function. The choice of TMC will have a non
negligible impact on the extraction of the gluon distribution
functions from experimental data.
I also point out the theoretical and phenomenological necessity
of not neglecting the current jet invariant mass in the computation. At leading order, jet mass corrections can be
achieved introducing in the formalism a collinearly factorized
jet function, analogous to the parton distributions. I will
comment on the connection between lattice QCD computations of
the quark propagator and the phenomenology of the jet function.