Our neutron scattering study on YbAl3C3 clearly reveals the presence of two well defined magnetic excitations at 1.5 and 3 meV at 4 K due to spin-dimer formation. Interestingly, the specific heat in zero applied field exhibits a peak near 5 K, while in 9 T applied field the peak moves to T->0 K. This 9 T field correspond to the same magnetic field where the magnetization at 1.1 K exhibits a jump and reveals plateaus, which indicates that at HC=9 T YbAl3C3 the magnons undergo Bose-Einstein condensation (BEC). Direct evidence of the BEC in YbAl3C3 can be obtained if the field dependence of the spin-gap can be measured and shown to close at HC=9T. This experiment is crucial and would help to confirm whether YbAl3C3 is really in a magnon BEC state or not at 9T field. We therefore propose to carry out high field and high resolution inelastic neutron scattering investigations using LET.