  KM3NeT is a research infrastructure housing the next generation neutrino
detectors in the depths of the Mediterranean Sea. The ARCA detector, which is
currently under construction, is optimized for searches for neutrinos from
astrophysical sources as well as measurements of the diffuse astrophysical
flux. The unambiguous detection of neutrinos of extraterrestrial origin by
IceCube has led to the first measurement of a high energy astrophysical
neutrino flux. The properties of sea water allow for a measurement of the
neutrino direction with an excellent angular resolution for both track and
cascade events. Here a method to differentiate track and shower events and a
method to reject the atmospheric muon background from starting track-like
events are combined in one analysis. The analysis on the discovery potential of
KM3NeT/ARCA for a diffuse astrophysical neutrino flux using events with the
reconstructed vertex inside the detector volume will be presented.
