Measurement of partial branching fractions of inclusive charmless B meson decays to K{sup +}, K{sup 0}, and {pi}{sup +}

We present measurements of partial branching fractions of B{yields}K{sup +}X, B{yields}K{sup 0}X, and B{yields}{pi}{sup +}X, where X denotes any accessible final state above the endpoint for B decays to charmed mesons, specifically for momenta of the candidate hadron greater than 2.34 (2.36) GeV for kaons (pions) in the B rest frame. These measurements are sensitive to potential new-physics particles which could enter the b{yields}s(d) loop transitions. The analysis is performed on a data sample consisting of 383x10{sup 6}BB pairs collected with the BABAR detector at the PEP-II e{sup +}e{sup -} asymmetric energy collider. We observe the inclusive B{yields}{pi}{sup +}X process, and we set upper limits for B{yields}K{sup +}X and B{yields}K{sup 0}X. Our results for these inclusive branching fractions are consistent with those of known exclusive modes, and exclude large enhancements due to sources of new physics.