Abstract
Polarized {Lambda}{sub b} to {Lambda}{gamma} decays at the Z pole are shown to be well suited for probing a large variety of New Physics effects. A new observable is proposed, the angular asymmetry between the {Lambda}{sub b} spin and photon momentum, which is sensitive to the relative strengths of the opposite chirality and Standard Model chirality b to s {gamma} dipole operators. Combination with the {Lambda} decay polarization asymmetry and comparison with the {Lambda}{sub b} polarization extracted from semileptonic decays allows important tests of the V-A structure of the Standard Model. Modifications of the rates and angular asymmetries which arise at next-to-leading order are discussed. Measurements for {Lambda}{sub b} to {Lambda}{gamma} and the CP conjugate mode, with branching ratios of a few times 10{sup -5}, are shown to be sensitive to non-standard sources of CP violation in the {Lambda}{sub b} to {Lambda}{gamma} matrix element. Form factor relations for heavy-to-light baryon decays are derived in the large energy limit, which are of general interest.
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