Search for Lepton Number and Flavor Violation in K

Searches for the lepton number violating K^{+}→π^{-}µ^{+}e^{+} decay and the lepton flavor violating K^{+}→π^{+}µ^{-}e^{+} and π^{0}→µ^{-}e^{+} decays are reported using data collected by the NA62 experiment at CERN in 2017-2018. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90% confidence level: B(K^{+}→π^{-}µ^{+}e^{+})<4.2×10^{-11}, B(K^{+}→π^{+}µ^{-}e^{+})<6.6×10^{-11} and B(π^{0}→µ^{-}e^{+})<3.2×10^{-10}. These results improve by 1 order of magnitude over previous results for these decay modes.

Patient classification systems, Part 2: The third generation.

In Part 1 (July/August 1999), the authors reviewed the evolution of patient classification systems over four generations of progress, discussed issues of system credibility, and presented a third-generation patient classification system (3PCS) to address the shortcomings of current systems. In this article, an actual implementation of a 3PCS is presented by the authors in collaboration with system users. The development, implementation, and evaluation of the 3PCS, as well as the overall advantages, are discussed. Finally, the authors share lessons learned and thoughts for the future.

Patient classification systems, Part 1: The third generation.

In part 1 of this series, the authors review the evolution of patient classification system (PCS) utilization and describe a third-generation PCS model (3PCS) that focuses on optimizing the patient-caregiver process for the outcomes of cost, health, and caregiver satisfaction. Part 2 (September 1999) will review the implementation of 3 PCS in a large urban hospital. Project rationale, methods for developing and implementing the system, key system components, advantages of the new system, and obstacles to implementation will be presented.