Orbital-resolved three-body recombination across a p-wave Feshbach resonance in ultracold ${}^6$Li

Abstract

We report precision, orbital-resolved measurements of three-body recombination near the 159~G $p$-wave Feshbach resonance in an ultracold gas of ${}^6$Li atoms prepared in their lowest hyperfine state. Using a radio-frequency gated protocol that suppresses magnetic-field transients below the milligauss level, we resolve loss features associated with the $|m_{\ell }|=1$ and $m_{\ell }=0$ orbital projections. The measured three-body loss coefficient $L_3$ is well captured by a thermally averaged cascade-recombination model, enabling extraction of the resonance splitting $\hat{I}´B$ and effective-range parameter $k_e$. At the lowest temperature, we obtain $\hat{I}´B=7.6(3)$~mG and $k_e=0.151(6)a_0^{-1}$, both in quantitative agreement with coupled-channel theory. These results establish orbital-resolved three-body spectroscopy as a precision probe of $p$-wave scattering and provide a benchmark for microscopic models of resonant few-body loss.