Search for the Familon via B±π±X0, B±K±X0, and B0KS0X0 Decays

R. Ammar et al. (CLEO Collaboration)
Phys. Rev. Lett. 87, 271801 – Published 11 December 2001
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Abstract

We have searched for the two-body decay of the B meson to a light pseudoscalar meson h=π±,K±,KS0 and a massless neutral feebly interacting particle X0 such 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 9.7×106 BB¯ mesons collected with the CLEO detector at the Cornell Electron Storage Ring, and set 90% C.L. upper limits B(B±h±X0)=4.9×105 and B(B0KS0X0)=5.3×105. 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.

  • Received 6 June 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.271801

©2001 American Physical Society

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Vol. 87, Iss. 27 — 31 December 2001

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