Jun 2 – 7, 2019
Carnegie Mellon University
America/New_York timezone

Determination of Pion Parton Distributions Using Threshold Resummation

Jun 6, 2019, 2:00 PM
Rangos 3

Rangos 3

Contributed Nucleon Structure Nucleon Structure


Patrick Barry (North Carolina State University)


The pion’s makeup of quarks, antiquarks, and gluons (or partons) can be described in terms of
its parton distribution functions (PDFs). These are functions of the partons’ momentum
fraction, $x$, relative to the pion. Recently, we were able to determine the pion’s PDF at high- and
low-$x$ regions using Drell-Yan (DY) and Leading Neutron (LN) data. In the DY process, two
hadrons collide, one donating a quark the other donating an antiquark, producing a dimuon
pair. In LN electroproduction, an electron beam is incident on a proton, which splits into a
charged pion and a detected neutron. The exchanged virtual photon probes the pion. In this
work, we aim to pin down the pion’s PDFs at $x$ near 1 using threshold resummation (TR) on DY.
At threshold, all energy from the initial hadrons produces the dilepton pair. Just below
threshold, soft gluons are emitted and inflate the cross-section. TR sums the contribution of the
soft gluons to all orders in perturbative QCD. We present preliminary results of the pion PDFs
using TR.

Early Consideration No
Graduate Student Yes

Primary authors

Patrick Barry (North Carolina State University) Dr Nobuo Sato (Old Dominion University) Dr Wally Melnitchouk (Jefferson Lab) Dr Chueng Ji (North Carolina State University)

Presentation materials