Inspired by the new measurements on B-→ η(′)ℓ over(ν, ̄)ℓfrom the BaBar Collaboration, we examine the constraint on the flavor-singlet mechanism, proposed to understand the large branching ratios for B → η′K decays. Based on the mechanism, we study the decays of over(B, ̄)d, s→ η(′)ℓ+ℓ-and find that they are sensitive to the flavor-singlet effects. In particular, we show that the decay branching ratios of over(B, ̄)d, s→ η′ℓ+ℓ-can be as large as O (10-8) and O (10-6), respectively. © 2006 Elsevier B.V. All rights reserved.
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