We have searched for the two-body decay of the B meson to a light pseudoscalar meson h = π±, K±, KS0and a massless neutral feebly interacting particle X0such as the familon, the Nambu-Goldstone boson associated with a spontaneously broken global family symmetry. We find no significant signal by analyzing a data sample containing 9.7 × 106BB―mesons collected with the CLEO detector at the Cornell Electron Storage Ring, and set 90% C.L. upper limits V and B±→ h±X0) = 4.9 × 10-5and B(B → KS0X0) = 5.3 × 10-5. These limits correspond to a lower bound of approximately 108GeV on the family symmetry breaking scale with vector coupling involving the third generation of quarks.

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Persistent URL dx.doi.org/10.1103/PhysRevLett.87.271801
Journal Physical Review Letters
Ammar, R. (R.), Bean, A. (A.), Besson, D. (D.), Zhao, X. (X.), Anderson, S. (S.), Frolov, V.V. (V. V.), … Sadoff, A.J. (A. J.). (2001). Search for the Familon via B±→ π±X0, B±→ K±X0, and B0→ Ks0X0Decays. Physical Review Letters, 87(27), 271801–271801‐5. doi:10.1103/PhysRevLett.87.271801