Hot Topics from the BABAR Experiment
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Published: 2007
Total Pages: 14
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DOWNLOAD EBOOKWith a sample of about 384 million B{bar B} pairs recorded with the BABAR detector, we search for the flavor-changing charged current transition B{sup ±} →?±? and perform an amplitude analysis of the effective flavor-changing neutral current transition B{sup ±} → {var_phi}(1020)K*(892)±. We also extend our search for other K* final states in the decay B° → {var_phi}(1020)K*0 with a large K*0 → K?− invariant mass. Two samples of events with one reconstructed hadronic B decay or one reconstructed semileptonic B decay are selected, and in the recoil a search for B{sup ±} →?±? is performed. We find a 2.6? (3.2? not including expected background uncertainty) excess in data which can be converted to a preliminary branching fraction central value of?(B{sup ±} →?±?) = (1.20{sup +0.40+0.29}{sub -0.38-0.30} ± 0.22) x 10−4. With the decay B{sup {+-}} → {var_phi}(1020)K*(892){sup {+-}}, twelve parameters are measured, where our measurements of f{sub L} = 0.49 {+-} 0.05 {+-} 0.03, f{sub {perpendicular}} = 0.21 {+-} 0.05 {+-} 0.02, and the strong phases point to the presence of a substantial helicity-plus amplitude from a presently unknown source.
