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We measure higher partial wave Feshbach resonances in an ultracold mixture offermionic $^6$Li and bosonic $^{133}$Cs by magnetic field dependent atom-lossspectroscopy. For the $p$-wave Feshbach resonances we observe tripletstructures corresponding to different projections of the pair rotation angularmomentum onto the external magnetic field axis.  We attribute the splittings to the spin-spin and spin-rotation couplings bymodelling the observation using a full coupled-channel calculation. Comparisonwith an oversimplified model, estimating the spin-rotation coupling bydescribing the weakly bound close-channel molecular state with the perturbativemultipole expansion, reveals the significant contribution of the molecularwavefunction at short internuclear distances. Our findings highlight thepotential of Feshbach resonances in providing precise information on short- andintermediate-range molecular couplings and wavefunctions. The observed $d$-waveFeshbach resonances allow us to refine the LiCs singlet and tripletground-state molecular potential curves at large internuclear separations.

High partial-wave Feshbach resonances in an ultracold $^6$Li-$^{133}$Cs mixture