Observation of High Momentum ${\eta }^{\prime }$ Production in B Decay

Abstract

We report the first observation of $B\to {\eta }^{\prime }X$ transitions with high momentum ${\eta }^{\prime }$ mesons. We observe $39.0\pm 11.6$ B decay events with $2.0<p_{{\eta }^{\prime }}<2.7$ GeV/c, the high momentum region where background from $b\to c$ processes is suppressed. We discuss the physical interpretation of the signal, including the possibility that it is due to $b\to s{g}^{\ast }$ transitions. Given that interpretation, we find $\mathcal{B}(B\to {\eta }^{\prime }{X}_s)=(6.2\pm 1.6(stat)\pm 1.3(sys{)}_{-1.5}^{+0.0}(bkg))\times 10^{-4}$ for $2.0<p_{{\eta }^{\prime }}<2.7$ GeV/c.

14 pages, 4 Postscript figures, postscript file also available through http://w4.lns.cornell.edu/public/CLNS. Submitted to Physical Review Letters

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