The polarization-dependent part of the neutron scattering in the triangular-lattice antiferromagnet is studied. This scattering appears in an external magnetic field and is determined by the projection of a chiral fluctuation on the sample magnetization (the dynamical chirality, DC). It is shown that the DC cross section is an odd function of the energy transfer, , and is proportional to the magnetic field up to 10 kOe above . A Be filter is used instead of the analyser for measuring the DC scattering integrated over . It is shown that below the field dependence of this intensity reveals two features related to the acoustic spin waves and to a new type of low-energy magnetic excitation, presumably of topological nature. The temperature dependence of the acoustic spin waves near is in qualitative agreement with dynamical scaling.