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Experiments indicate lines of zero gap, but which pairing state forms is unknown.","posed_since":"2016","precise":"YPtBi ($\\Gamma_{8}$ band, $n \\sim 2 \\times 10^{18}\\ \\mathrm{cm}^{-3}$, $T_{c} \\sim 0.78\\ \\mathrm{K}$) shows a penetration depth linear in $T$ suggesting line nodes (Kim et al., Science Advances 2018) and an upper critical field above the Pauli limit. Identify the order parameter among $j = 3/2$ pairing channels (septet $J = 3$, quintet $J = 2$, singlet-septet mixture allowed by broken inversion) and its pairing interaction. An answer is a symmetry identification consistent with penetration depth, NMR, critical-field and tunneling data.","problem_ref":"1556471aceff89e4ac7ba529a6a220bdd6a394873c0015f3b653bed4823e071c","references":"","settled_by":"Phase-sensitive or angle-resolved gap measurements (e.g. field-angle thermal conductivity or Josephson interferometry) that discriminate between the $J = 2$ and $J = 3$ candidate states.","status_note":"","title":"Pairing state of total angular momentum $3/2$ fermions in 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