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arXiv:2512.02479

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

Shaokun Liu, Z. P. Xu, Peng, Shuai, Sijia Peng, Tangqian Shu, Jiaming Li, Le Luo

Published Dec 2, 2025• 0 citations
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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 $δB$ and effective-range parameter $k_e$. At the lowest temperature, we obtain $δB = 7.6(3)$~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.

DOI
10.48550/arxiv.2512.02479

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