Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 80, 3710 (1998). Copyright © 1998 American Physical Society. Permission to use.


In a sample of 6.6 X 106 produced B mesons we have observed decays B → η′K, with branching fractions Ɓ(B+ → η′K) = 6.5-1.4+1.5± 0.9) X 10-5 and Ɓ(B0 → η′K0) = 4.7-2.0+2.7 ± 0.9) X 10-5. We have searched with comparable sensitivity for 17 related decays to final states containing an η or η′ meson accompanied by a single particle or low-lying resonance. Our upper limits for these constrain theoretical interpretations of the B → η′K signal.

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