| Abstract |
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We study the two-body decays of $B^\pm$ mesons to $K^\pm$ and a
charmonium state, $X_{c\bar c}$, in
a sample of 210.5 fb$^{-1}$ of data from the
BaBar experiment.
We perform measurements of absolute branching fractions
BR($B^\pm \to K^\pm X_{c\bar c}$)
using a missing mass technique,
and report several new or improved results.
In particular, the upper limit
BR$(B^\pm \to K^\pm X(3872))<3.2 \times 10^{-4}$ at 90\% CL and the inferred
lower limit BR$(X(3872) \to J/\psi\pi^+\pi^-)>4.2\%$ will
help in understanding the nature of the recently discovered $X(3872)$.
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