Work

Signatures of Invisible Fermions in $Λ_b^0 \to Λ_c^+ \ell^- \bar{X}_{\rm inv}$ Decays

Year: 2026

Type: preprint

Abstract: We investigate the effects of a massive invisible fermion in $Λ_b^0 \to Λ_c^+ \ell^- \bar{X}_{\rm inv}$ decays using a model-independent weak effective theory. Through a comprehensive angular analysis, we show that a nonzero invisible-particle mass leaves characteristic imprints on angular observables that can distinguish massless and massive invisible states. We further demonstrate that these observables provide strong discrimination among vector/axial-vector, scalar/pseudoscalar, and tensor interactions, as well as between left- and right-handed quark and lepton current operators.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.11840

Authors: Sahoo, Shantanu, Nandi, Soumitra

Institutions: Indian Institute of Technology Guwahati, University of Hyderabad

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7212255136

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