CP Violation in Hyperon Nonleptonic Decays within the Standard Model

Details CP Violation in Hyperon Nonleptonic Decays within the Standard Model CP Violation in Hyperon Nonleptonic Decays within the Standard Model

2002-11-12

arxiv.org/abs/hep-ph/0211165v2

Phys.Rev. D67 (2003) 056001

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 2 figures; discussion clarified, results & conclusions unchanged, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.056001

We calculate the CP-violating asymmetries A(Lambda_-^0) and A(Xi_-^-) in nonleptonic hyperon decay within the Standard Model using the framework of heavy-baryon chiral perturbation theory (chiPT). We identify those terms that correspond to previous calculations and discover several errors in the existing literature. We present a new result for the lowest-order (in chiPT) contribution of the penguin operator to these asymmetries, as well as an estimate for the uncertainty of our result that is based on the calculation of the leading nonanalytic corrections.

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