2003/11/04 by Jusak Tandean
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.69.076008
published as Phys.Rev. D69 (2004) 076008 · 12 pages, 2 figures
arxiv created 2003/11/04 · openalex publication_date 2004/04/16 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The sum of the CP-violating asymmetries A(\ensuremathΛ_\ensuremath-0) and A(\ensuremathΞ_\ensuremath-^\ensuremath-) in hyperon nonleptonic decays is presently being measured by the E871 experiment. We evaluate contributions to the asymmetries induced by chromomagnetic-penguin operators, whose coefficients can be enhanced in certain models of new physics. Incorporating recent information on the strong phases in \stackrel\ensuremath→\ensuremathΞ\ensuremathΛ\ensuremathπ decay, we show that new-physics contributions to the two asymmetries can be comparable. We explore how the upcoming results of E871 may constrain the coefficients of the operators. We find that its preliminary measurement is already better than the \ensuremathε parameter of K\ensuremath-K mixing in bounding the parity-conserving contributions.