  We investigate the electronic structures of noncentrosymmetric Weyl
semimetals RAlSi (R: Ce and Nd) using soft x-ray angle-resolved photoemission
spectroscopy. We find that the photoelectron intensity distribution observed in
the momentum-resolved electronic bands is highly sensitive to the covered
Brillouin zone (BZ) due to the zone-selection effect arising from the
nonsymmorphic crystal structure of RAlSi. Our data reconstruct the
photoelectron distributions varied according to the zone-selection effect, and
reveal comprehensive information about the electronic band structures
reproduced by band calculations. This detailed information enables us to
experimentally trace the Weyl-cone dispersion throughout three-dimensional
momentum space, providing valuable insights into the unique properties of
RAlSi.
