Search for the Familon via $B^{\pm}\to π^{\pm}X^{0}$, $B^{\pm}\to K^{\pm}X^{0}$, and $B^{0}\to K_{S}^{0} X^{0}$ Decays

R. Ammar; CLEO Collaboration

doi:10.1103/PhysRevLett.87.271801

paper

Search for the Familon via $B^{\pm} \to π^{\pm} X^{0}$ , $B^{\pm} \to K^{\pm} X^{0}$ , and $B^{0} \to K_{S}^{0} X^{0}$ Decays

arXiv:hep-ex/0106038 · doi:10.1103/PhysRevLett.87.271801

Abstract

We have searched for the two-body decay of the B meson to a light pseudoscalar meson $h = π^{+}, K^{+}, K_{S}^{0}$ and a massless neutral weakly-interacting particle $X^{0}$ 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 million $B B ˉ$ mesons collected with the CLEO detector at the Cornell Electron Storage Ring, and set a 90% C.L. upper limit of $4.9 \times 1 0^{- 5}$ and $5.3 \times 1 0^{- 5}$ on the branching fraction for the decays $B^{+} \to h^{+} X^{0}$ and $B^{0} \to K_{S}^{0} X^{0}$ , respectively. These upper limits correspond to a lower bound of about $1 0^{8}$ GeV on the family symmetry breaking scale involving the third generation of quarks.

10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

Search for the Familon via B±→π±X0, B±→K±X0, and B0→KS0​X0 Decays

Abstract

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Search for the Familon via $B^{\pm} \to π^{\pm} X^{0}$ , $B^{\pm} \to K^{\pm} X^{0}$ , and $B^{0} \to K_{S}^{0} X^{0}$ Decays