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Establishing CP Violation in b-Baryon Decays
Jia-Jie Han1, Ji-Xin Yu1, Ya Li2
1Lanzhou University, Frontiers Science Center for Rare Isotopes, and School of Nuclear Science and Technology, Lanzhou 730000, People's Republic of China.
Abstract:
It is a long-standing puzzle why the CP violation (CPV) in the baryon system has not yet been definitively established as in the meson one. We demonstrate that individual partial-wave CPV in the Λ_{b}→pπ^{-} and pK^{-} decays can exceed 10%, but the destruction between the partial waves (the suppression by the small partial-wave weight) results in a small net direct CPV in the former (the latter) as measured currently. Our finding highlights the different dynamics responsible for CPVs in baryon and meson decays. We propose to probe the CPV observables associated with the angular distributions of the Λ_{b}→pa_{1}(1260), pK_{1}(1270) decay products, which are large enough for being identified experimentally.
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