1,973 research outputs found
Effects of CP-violating phases in supersymmetry
Recent studies about the impact of the CP-violating complex parameters in
supersymmetry on the decays of third generation squarks and about T-odd
asymmetries in neutralino and chargino production and decay are reviewed. The
CP-even branching ratios of the third generation squarks show a pronounced
dependence on the phases of A_t, A_b, mu and M_1 in a large region of the
supersymmetric parameter space. This could have important implications for stop
and sbottom searches and the MSSM parameter determination in future collider
experiments. We have estimated the expected accuracy in the determination of
the parameters by global fits of measured masses, decay branching ratios and
production cross sections. We have found that the parameter A_t can be
determined with an error of 2 - 3%, whereas the error on A_b is likely to be of
the order of 50 - 100%. In addition we have studied CP-odd observables, like
asymmetries based on triple product correlations, which are necessary to
unambiguously establish CP violation. We have analysed these asymmetries in
neutralino and chargino production with subsequent three-body decays at the
International Linear Collider with longitudinally polarised beams in the MSSM
with complex parameters M_1 and mu. The asymmetries, which appear already at
tree-level because of spin correlation between production and decay, can be as
large as 20% and will therefore be an important tool for the search for
CP-violating effects in supersymmetry.Comment: 13 pages, LaTeX, 7 eps figures, uses appolb.cls, presented at the
final meeting of the European Network ``Physics at Colliders'', Montpellier,
September 26 - 27, 200
Single-cell copy number variation detection
Detection of chromosomal aberrations from a single cell by array comparative genomic hybridization (single-cell array CGH), instead of from a population of cells, is an emerging technique. However, such detection is challenging because of the genome artifacts and the DNA amplification process inherent to the single cell approach. Current normalization algorithms result in inaccurate aberration detection for single-cell data. We propose a normalization method based on channel, genome composition and recurrent genome artifact corrections. We demonstrate that the proposed channel clone normalization significantly improves the copy number variation detection in both simulated and real single-cell array CGH data
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