Lepton flavor violating Λ_b→Λℓ₁ℓ₂ decay

2019/09/18 by Das, Diganta
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1909.08676

Abstract

Inspired by the recent hints of lepton flavor universality violation in b→ sℓℓ and b→ cℓν transitions, we study lepton flavor violating exclusive Λ_b→Λℓ₁⁺ℓ₂^- (ℓ₁≠ ℓ₂) decay, which is forbidden in the Standard Model. Starting from a general effective Hamiltonian for a b→ sℓ₁⁺ℓ₂^- transition that includes vector and axial-vector operators, and scalar and pseudo-scalar operators, we derive a two-fold decay distribution of Λ_b→Λℓ₁⁺ℓ₂^-. The distribution helps us to construct the differential branching ratio and the lepton side forward-backward asymmetry, which are studied in a vector leptoquark model. The parameter space of the vector leptoquark model is constrained by low energy observables.

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