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The authors present a search for the B− → K−?{bar {nu}}, B− →?− {bar {nu}} and B− →?− {bar {nu}} decays in a data sample of 82 fb−1 collected at the?(4S) resonance with the BABAR detector at the SLAC PEP-II asymmetric B Factory. They find no evidence of signal for such decays and for all of them they set a 90% C.L. upper limit.
We present a search for the decays B → K*?{bar?} using 454 x 106 B{bar B} pairs collected at the?(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We first select an event sample where one B is reconstructed in a semileptonic or hadronic mode with one charmed meson. The remaining particles in the event are then examined to search for a B → K*?{bar?} decay. The charged K* is reconstructed as K* → K{sub S}°?+ or K*+ → K+?°; the neutral K* is identified in K*° → K+?− mode. We establish upper limits at 90% confidence level of?(B+ → K*+?{bar {nu}})
A search for the rare, flavour-changing neutral current decay B 2!K [nu]{bar [nu]} is presented using 81.9 fb−1 of data collected at the [Upsilon](4S) resonance by the BABAR experiment. Signal candidate events are selected through the identification of a high momentum charged kaon and significant missing energy, where the companion B− in the event has decayed semileptonically via B− 2!D°l−{bar [nu]} X and X is kinematically constrained to be either nothing or a low momentum transition photon or [pi]°. The analysis was performed blind and 6 candidates were selected with a background expectation of 3.4 ± 1.2. This leads to a limit on the branching fraction of [Beta] (B+ 2!K+ [nu]{bar {nu}})
We present a preliminary search for the flavor-changing neutral current decay B[sup+][yields] K[sup+][nu][bar[nu]] using 56 million[Upsilon](4S) decays recorded with the BABAR detector at the SLAC B factory. Identification of the B[sup+][yields] K[sup+][nu][bar[nu]] final state, with two neutrinos, requires the reconstruction of the companion B in the event. The companion B is reconstructed in the decay mode B[sup -][yields] D[sup 0][ell][sup -][bar[nu]] X, which provides both high efficiency and good purity. The particles not used in the reconstruction of the companion B are compared with the signature expected for B[sup+][yields] K[sup+][nu][bar[nu]] decays. Two candidates are found in the data with an expected background of 2.2 events. Under the assumption that all candidates are signal events, an upper limit on the branching fraction for B[sup+][yields] K[sup+][nu][bar[nu]] of 9.4 x 10[sup -5] at 90% confidence level is determined.
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