  In neutrino experiments, hemispherical photomultiplier tubes (PMTs) are often
used to cover large surfaces or volumes to maximize the photocathode coverage
with a minimum number of channels. Instrumentation is often coarse, and
neutrino event reconstruction and particle identification (PID) is usually done
through the morphology of PMT hits. In future neutrino experiments, it may be
desirable to perform PID from a few hits, or even a single hit, by utilizing
pulse shape information. In this report, we study the principle of pulse shape
PID using a single 10-inch hemispherical PMT in a spherical glass housing for
future neutrino telescopes. We use the Fermilab Test Beam Facility (FTBF) MTest
beamline to demonstrate that with pulse shape PID, statistical separation is
possible to distinguish 2 GeV electrons from 8 GeV pions, where the total
charge deposition is ~20 PE in our setup. Such techniques can be applied to
future neutrino telescopes focusing on low energy physics, including the
IceCube-Upgrade.
