# Production of vector K mesons and their spin alignment in NOMAD

First measurements of $K^\star(892)^\pm$ mesons production properties and their spin alignment in $\nu_\mu$ charged current (CC) and neutral current (NC) interactions are presented. The analysis of the full data sample of the NOMAD experiment is performed in different kinematic regions. For ${K^\star}^+$ and ${K^\star}^-$ mesons produced in $\nu_\mu$ CC interactions and decaying into $K^0 \pi^\pm$ we have found the following yields per event: $(2.6\pm0.2(\mbox{stat.})\pm0.2(\mbox{syst.}))\%$ and $(1.6\pm0.1(\mbox{stat.})\pm0.1(\mbox{syst.}))$ respectively, while for the ${K^\star}^+$ and ${K^\star}^-$ mesons produced in $\nu\mbox{NC}$ interactions the corresponding yields per event are: $(2.5\pm0.3(\mbox{stat.})\pm0.3(\mbox{syst.}))$ and $(1.0\pm0.3(\mbox{stat.})\pm0.2(\mbox{syst.}))$. The results obtained for the $\rho_{00}$ parameter, $0.40\pm0.06(\mbox{stat.})\pm0.03(\mbox{syst.})$ and $0.28\pm0.07(\mbox{stat.})\pm0.03(\mbox{syst.})$ for $K^\star(892)^+$ and $K^\star(892)^-$ produced in $\nu_\mu$ CC interactions, are compared to theoretical predictions tuned on LEP measurements in e+e- annihilation at the Z0 pole. For $K^\star(892)^+$ mesons produced in $\nu\mbox{NC}$ interactions the measured $\rho_{00}$ parameter is $0.66\pm0.10(\mbox{stat.})\pm0.05(\mbox{syst.})$.