New Physics and CP Violation in Hyperon Nonleptonic Decays

Details New Physics and CP Violation in Hyperon Nonleptonic Decays New Physics and CP Violation in Hyperon Nonleptonic Decays

2003-11-04

arxiv.org/abs/hep-ph/0311036v1

Phys.Rev. D69 (2004) 076008

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 2 figures

Scientific paper

10.1103/PhysRevD.69.076008

The sum of the CP-violating asymmetries A(Lambda_-^0) and A(Xi_-^-) 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 Xi->Lambda pi 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 epsilon parameter of K-Kbar mixing in bounding the parity-conserving contributions.

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