  Precision measurements of a collective mode in superfluid 3He B are sensitive
to quasiparticle and f wave pairing interactions. Measurements were performed
at various pressures using interference of transverse sound in an acoustic
cavity. We fit the measured collective mode frequencies, which depend on the
strength of f wave pairing and the Fermi liquid parameter F2s, to theoretical
predictions and discuss what implications these values have for observing new
order parameter collective modes.
