  The upcoming Cherenkov Telescope Array (CTA) project is expected to provide
unprecedented sensitivity in the low-energy (<~100 GeV) range for Cherenkov
telescopes. Most of the remaining background in this energy range results from
misidentified hadron showers. In order to fully exploit the potential of the
telescope systems it is worthwhile to look for ways to further improve the
available analysis methods for {\gamma}/hadron separation. We study the
composition of the background for the planned CTA-North array by identifying
events composed mostly of a single electromagnetic subcascade or double
subcascade from a {\pi}0 (or another neutral meson) decay. We apply the
standard simulation chain and state-of-the-art analysis chain of CTA to
evaluate the potential of the standard analysis to reject such events.
Simulations show a dominant role of such single subcascade background for CTA
up to energies ~70 GeV. We show that a natural way of rejection of such events
stems from a shifted location of the shower maximum, and that the standard
stereo reconstruction method used by CTA already exploits most of expected
separation.
