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.
ASJC Scopus subject areas
- Physics and Astronomy(all)