Search for a charged partner of the $X (3872)$ in the $B$ meson decay $B \to X^{-} K$ , $X^{-} \to J / ψ π^{-} π^{0}$

We search for a charged partner of the

X (3872)

in the decay

B \to X^{-} K

X^{-} \to J / ψ π^{-} π^{0}

, using

234 \times 10^{6}

B \bar{B}

events collected at the

Υ (4 S)

resonance with the BABAR detector at the PEP-II

e^{+} e^{-}

asymmetric-energy storage ring. The resulting product branching fraction upper limits are

B (B^{0} \to X^{-} K^{+}, X^{-} \to J / ψ π^{-} π^{0}) < 5.4 \times 10^{- 6}

and

B (B^{-} \to X^{-} {\bar{K}}^{0}, X^{-} \to J / ψ π^{-} π^{0}) < 22 \times 10^{- 6}

at the

90 %

confidence level.

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Search for a charged partner of the X(3872) in the B meson decay B→X−K, X−→J/ψπ−π0