T-violating triple-product correlations in charmless Λb decays

Using factorization, we compute, within the standard model, the T-violating triple-product correlations in the charmless decays Λb→F1F2, where F1 is a light spin-12 baryon and F2 is a pseudoscalar (P) or vector (V) meson. We find a large triple-product asymmetry of 18% for the decay Λb→pK−. However, for other classes of Λb→F1P decays, the asymmetry is found to be at most at the percent level. For Λb→F1V decays, we find that all triple-product asymmetries are small (at most O(1%)) for a transversely-polarized V, and are even smaller for longitudinal polarization. Our estimates of the nonfactorizable contributions to these decays show them to be negligible, and we describe ways of testing this.