Spin alignment of $K^{\ast }(892{)}^{\pm }$ mesons produced in neutron-carbon interactions

Abstract

A new precise measurements of spin density matrix element ${\rho }_{00}$ of $K^{\ast }(892{)}^{\pm }$ mesons produced inclusively in neutron-carbon interactions at \~60 GeV have been carried out in the EXCHARM experiment at the Serpukhov accelerator. The values of ${\rho }_{00}$ obtained in the transversity frame are $0.424\pm 0.011(stat)\pm 0.018(sys)$ for $K^{\ast }(892{)}^{+}$ and $0.393\pm 0.025(stat)\pm 0.018(sys)$ for $K^{\ast }(892{)}^{-}$. Significant $P_T$ dependence of ${\rho }_{00}$ has been observed in $K^{\ast }(892{)}^{+}$ production.

8 pages, LaTeX, 3 eps figures

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