B{r_arrow}K{eta}{sup {prime}} decay as a unique probe of the {eta}{sup {prime}} meson

A theory of the B{r_arrow}K{eta}{sup {prime}} decay is proposed. It is based on the Cabibbo-favored b{r_arrow}{bar c}cs process followed by a direct materialization of the {bar c}c pair into the {eta}{sup {prime}}. This mechanism works due to a nonvalence Zweig-rule-violating c-quark component of the {eta}{sup {prime}}, which is unique to its very special nature. This nonperturbative {open_quotes}intrinsic charm{close_quotes} content of the {eta}{sup {prime}} is evaluated using the operator product expansion and QCD low-energy theorems. Our results are consistent with an unexpectedly large B(B{r_arrow}K{eta}{sup {prime}}){approx_equal}7.8{times}10{sup {minus}5} recently announced by CLEO. {copyright} {ital 1997} {ital The American Physical Society}