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
30m
Rangos 3

### Rangos 3

Contributed Nucleon Structure

### Speaker

Patrick Barry (North Carolina State University)

### Description

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.