Study of $B\to \psi (2S)K$ and $B\to \psi (2S)K^{\ast }$(892) Decays

Abstract

Color-suppressed decays of $B$ mesons to final states with $\psi (2S)$ mesons have been observed with the CLEO detector. The branching fractions for the decays $B^{+}\to \psi (2S)K^{+}$, $B^{+}\to \psi (2S)K^{\ast }(892{)}^{+}$, $B^0\to \psi (2S)K^0$, and $B^0\to \psi (2S)K^{\ast }(892{)}^0$ are measured to be (7.8 +- 0.7 +- 0.9) 10^{-4}$,(9.2+-1.9+-1.2)10^{-4}$, (5.0 +- 1.1 +- 0.6) 10^{-4}$,and(7.6+-1.1+-1.0)10^{-4}$, respectively, where the first uncertainty is statistical and the second is systematic. The first measurement of the longitudinal polarization fraction is extracted from the angular analysis of the $B\to \psi (2S)K^{\ast }(892)$ candidates: ${\Gamma }_L/\Gamma =0.45+-0.11+-0.04$. Our measurements of the decays $B^0\to \psi (2S)K^0$ and $B^{+}\to \psi (2S)K^{\ast }(892{)}^{+}$ are first observations.

10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS