  In condensed matter systems, chiral topological nodes are robust band
crossing points in momentum space that carry nonzero Chern numbers. The
chirality is manifested by the presence of surface Fermi arcs connecting the
projections of nodes with opposite Chern numbers. In addition to the well-known
Weyl nodes, theorists have proposed several other types of chiral topological
nodes in condensed matter systems, but the direct experimental evidence of
their existence is still lacking. Here, using angle-resolved photoemission
spectroscopy, we reveal two types of new chiral nodes, namely the spin-1 nodes
and charge-2 Dirac nodes, at the band crossing points near the Fermi level in
CoSi, the projections of which on the (001) surface are connected by
topologically protected surface Fermi arcs. As these chiral nodes in CoSi are
enforced at the Brillouin zone (BZ) center and corner by the crystalline
symmetries, the surface Fermi arcs connecting their projections form a
non-contractible path traversing the entire (001) surface BZ, in sharp contrast
to pairs of Weyl nodes with small separation. Our work marks the first
experimental observation of chiral topological nodes beyond the Weyl nodes both
in the bulk and on the surface in condensed matter systems.
