Monte Carlo study shows that major sources of hadronic background
in the Radphi experiment are reactions with produced charged particles
reconstructed as neutral in the LGD, as well as all-neutral decays
of heavier mesons such as
![$b_1$](img8.png)
. The first source of background
can be suppressed
by requiring large energy deposition in the LGD or by using the CPV.
The second one cannot be suppressed by either of these two methods
or by energy restrictions in the BGV,
until the clusterizing technique is improved. It is found that a large fraction
of
![$b_1 \rightarrow 5\gamma$](img12.png)
decays with all 5 photons in the forward
region (
![$\theta < 25^0$](img13.png)
) are reconstructed as 3 or 4 cluster
events. This is because soft photons with energy below some threshold
(currently about 300 MeV) are not reconstructed.
In addition, some fraction of soft photons are merged with
a high-energy neighbor.