Fixed-Target CP-Violation Experiments at Fermilab

Studies of CP violation, for 30 years focused primarily on the neutral K meson, are on the threshold of a new era as experiments approach Standard-Model sensitivities in decays of beauty, charm, and hyperons. The array of heavy-quark experiments approved and planned at Fermilab may lead to a significant breakthrough in the next five to ten years.Comment: Revised and expanded for greater clarity and completeness. 15 pages, 6 PostScript figure

Muon Colliders and Neutrino Factories

Muon colliders and neutrino factories are attractive options for future facilities aimed at achieving the highest lepton-antilepton collision energies and precision measurements of Higgs boson and neutrino mixing matrix parameters. The facility performance and cost depend on how well a beam of muons can be cooled. Recent progress in muon cooling design studies and prototype tests nourishes the hope that such facilities could be built starting in the coming decade. The status of the key technologies and their various demonstration experiments is summarized. Prospects "post-P5" are also discussed.Comment: 16 pages, 10 figures. To appear in Proc. ICNFP201

Remarks on Muon g−2g-2 Experiments and Possible CP Violation in π→μ→e\pi\to\mu\to e Decay

The first experimental limit on CP violation in pi -> mu -> e decay is extracted from published results of the CERN g-2 experiment.Comment: 2 pages, LaTeX, submitted to Phys. Rev.

A Dynamic Era-Based Time-Symmetric Block Time-Step Algorithm with Parallel Implementations

The time-symmetric block time--step (TSBTS) algorithm is a newly developed efficient scheme for $N$--body integrations. It is constructed on an era-based iteration. In this work, we re-designed the TSBTS integration scheme with dynamically changing era size. A number of numerical tests were performed to show the importance of choosing the size of the era, especially for long time integrations. Our second aim was to show that the TSBTS scheme is as suitable as previously known schemes for developing parallel $N$--body codes. In this work, we relied on a parallel scheme using the copy algorithm for the time-symmetric scheme. We implemented a hybrid of data and task parallelization for force calculation to handle load balancing problems that can appear in practice. Using the Plummer model initial conditions for different numbers of particles, we obtained the expected efficiency and speedup for a small number of particles. Although parallelization of the direct $N$--body codes is negatively affected by the communication/calculation ratios, we obtained good load balance results. Moreover, we were able to conserve the advantages of the algorithm (e.g., energy conservation for long--term simulations).Comment: 18 pages, 11 figures, accepted for publication in PAS