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We present measurements of partial branching fractions of $B \rightarrow K^+X$, $B \rightarrow K^0 X$, and $B \rightarrow \pi^+ X$, where $X$ denotes anyaccessible final state above the endpoint for B decays to charmed mesons,specifically for momenta of the candidate hadron greater than 2.34 (2.36) GeVfor kaons (pions) in the B rest frame. These measurements are sensitive topotential new-physics particles which could enter the $b \rightarrow s(d)$ looptransitions. The analysis is performed on a data sample consisting of $383\times 10^6$ $B \bar{B}$ pairs collected with the BaBar detector at the PEP-II$e^+e^-$ asymmetric energy collider. Our results are in agreement with standardmodel predictions and exclude large enhancements of the inclusive branchingfraction due to sources of new physics.

Measurement of partial branching fractions of inclusive charmless B meson decays to K+, K0, and pi+