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The parity-violating (PV) nucleon-nucleon ($N\!N$) interaction in thethree-nucleon system is investigated using pionless effective field theory($\mathrm{EFT}(/\!\!\!\pi)$). This work shows that a next-to-leading order(NLO) PV three-body force is necessary in contradiction with a previous claim[Griesshammer and Schindler in Eur. Phys. J. A 46, 73 (2010)]. Includingthree-body $P$ to $D$-wave transitions PV three-nucleon observables arecalculated to higher energies than previously considered. Using the recentlarge-$N_{C}$ analysis of the PV $N\!N$ interaction in$\mathrm{EFT}(/\!\!\!\pi)$ the current understanding of low energy PV few-bodymeasurements is reassessed. The recent measurement of the asymmetry$A_{\gamma}$ in $\vec{n}p\to d\gamma$ from the NPDGamma collaboration [D. Blythet al. (NPDGamma), Phys. Rev. Lett. 121, 242002 (2018)], gives the value$g_{4}^{(N_{C}^{-1})}=(-1.4\pm 0.63(stat.)\pm 0.09(syst.))\times10^{-10}~\mathrm{MeV}^{-1}$ for a next-to-next-to-leading order (N$^{2}$LO) inlarge-$N_{C}$ low energy constant (LEC). Using the large-$N_{C}$ hierarchy ofLECs the sizes of the leading order (LO) in large-$N_{C}$ LECs are estimatedusing an experimental bound on a parity violating asymmetry in $\vec{p}d$scattering at $E_{\mathrm{lab}}=15$ MeV and a measurement of $\vec{pp}$scattering at $E_{\mathrm{lab}}=13.6$ MeV. Comparing the size of the resultingLO in large-$N_{C}$ LECs to the N$^{2}$LO in large-$N_{C}$ LEC$g_{4}^{(N_{C}^{-1})}$ shows they are roughly the same size in contradictionwith current large-$N_{C}$ counting.

Parity-Violating Three Nucleon Interactions at Low Energies and Large-$N_{C}$