Measured inclusive B(Z → 4ℓ) = 4.67 ± 0.21 × 10^{-6} with individual modes, differential distributions, and triple-product asymmetry limits.
New-Physics Effects on Triple-Product Correlations in Lambda_b Decays
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abstract
We adopt an effective-lagrangian approach to compute the new-physics contributions to T-violating triple-product correlations in charmless Lambda_b decays. We use factorization and work to leading order in the heavy-quark expansion. We find that the standard-model (SM) predictions for such correlations can be significantly modified. For example, triple products which are expected to vanish in the SM can be enormous (~50%) in the presence of new physics. By measuring triple products in a variety of Lambda_b decays, one can diagnose which new-physics operators are or are not present. Our general results can be applied to any specific model of new physics by simply calculating which operators appear in that model.
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2026 1verdicts
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Studies of Z $\to$ 4$\ell$ decays in proton-proton collisions at $\sqrt{s}$ = 8 and 13 TeV
Measured inclusive B(Z → 4ℓ) = 4.67 ± 0.21 × 10^{-6} with individual modes, differential distributions, and triple-product asymmetry limits.