Search for the Familon via B±→ π±X0, B±→ K±X0, and B0→ Ks0X0Decays

CLEO Collaboration

Research output: Contribution to journalArticlepeer-review


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 × 106BBmesons 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.

Original languageEnglish (US)
Pages (from-to)271801-271801-5
JournalPhysical review letters
Issue number27
StatePublished - Dec 31 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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