Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-08
Phys.Rev. D65 (2002) 074038
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, 2 figures, comments and references on 1/m effects added, conclusions unchanged, version to appear in PRD
Scientific paper
10.1103/PhysRevD.65.074038
Polarized $\Lambda_b \to \Lambda \gamma$ 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 $\Lambda_b$ 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 $\Lambda_b$ 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 $\Lambda_b \to \Lambda \gamma$ and the CP conjugate mode, with branching ratios of a few times $10^{-5}$, are shown to be sensitive to non-standard sources of CP violation in the $\Lambda_b \to \Lambda \gamma$ matrix element. Form factor relations for heavy-to-light baryon decays are derived in the large energy limit, which are of general interest.
Hiller Gerald
Kagan Alex
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