Branching fractions for Y(3S) -> pi^0 h_b and psi(2S) -> pi^0 h_c
  Using e^+e^- collision data corresponding to 5.88M Y(3S) [25.9M psi(2S)] decays and acquired by the CLEO III [CLEO-c] detectors operating at CESR, we study the single-pion transitions from Y(3S) [psi(2S)] to the respective spin-singlet states h_{b[c]}. Utilizing only the momentum of suitably selected transition-pi^0 candidates, we obtain the upper limit B(Y(3S) -> pi^0 h_b) < 1.2\times 10^{-3} at 90% confidence level, and measure B(psi(2S) -> pi^0 h_c) = (9.0+-1.5+-1.3)\times 10^{-4}. Signal sensitivities are enhanced by excluding very asymmetric pi^0 -> gamma gamma candidates. 
CLEO Collaboration: J. Y. Ge, D. H. Miller, I. P. J. Shipsey, B. Xin,   G. S. Adams, J. Napolitano, K. M. Ecklund, J. Insler...
hep-ex