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Preliminary results on the Doubly Cabibbo Suppressed Decays (DCSD) D[sup +] [yields] K[sup +][pi][sup +][pi][sup [minus]] and D[sup +] [yields] K[sup +]K[sup +]K[sup [minus]] from roughly 40% of the E791 data set are summarized. The authors present an analysis of candidate events from E791 data in these decay modes. They show that there is a clear signal in the D[sup +] [yields] K[sup +][pi][sup +][pi][sup [minus]] mode and discuss backgrounds and sources of error in the results. They disagree with a published signal level in the D[sup +] [yields] K[sup +]K[sup +]K[sup [minus]] mode.
Experiment E865 at the BNL AGS is a search for the lepton number violating decay K[sup+][r-arrow][pi][sup+][mu][sup+]e[sup[minus]] with an expected sensitivity of 3[times] 10[sup[minus]12]. The experimental apparatus involves a magnetic spectrometer with two Cerenkov counters, a calorimeter and a muon detector for particle identification. In addition, other rare K[sup+] decays are studied. The experiment has been collecting data since 1995, and preliminary results are presented.
Preliminary results are presented from the first large-statistics partial wave analysis of K−? system produced in the reaction K{sup -p {yields} K−??−?°p at 11 GeV/c observed with the LASS spectrometer at SLAC. The analysis is based on the moments of the joint angular distributions of the decay to the K−?} system, with subsequent? decay to?+?−?0. The resulting J{sup P} = 2−, 2+ and 3− amplitudes exhibit resonant behavior, and are discussed in the context of the relevant Briet-Wigner fits.
We present results of a search for D[sup 0]-[bar D][sup 0] mixing and a measurement of R[sub D], the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays, based on an analysis of D[sup 0][yields] K[sup+][pi][sup -] decays in 57.1 fb[sup -1] of data collected at or just below the[Upsilon](4S) resonance with the BABAR detector at the PEP-II collider. Our results are compatible with no mixing and no CP violation. At the 95% confidence level, allowing for CP violation, we find the mixing parameters x[prime][sup 2]
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