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PreprintCC BY 4.0arXiv

Signatures of Invisible Fermions in Λb0 → Λc+ ℓ- X̅inv Decays

  • Shantanu Sahoo
  • Soumitra Nandi
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Abstract

We investigate the effects of a massive invisible fermion in Λb0 → Λc+ ℓ- X̅inv 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.

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Cite

BibTeXRIS
BibTeX
@misc{sahoo2026signatures,
  title = {{Signatures of Invisible Fermions in $Λ_b^0 \to Λ_c^+ \ell^- \barX_\rm inv$ Decays}},
  author = {Shantanu Sahoo and Soumitra Nandi},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.11840},
  eprint = {2609.11840},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.11840},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Signatures of Invisible Fermions in Λ_b^0 → Λ_c^+ ℓ^- X̅_inv Decays
AU  - Shantanu Sahoo
AU  - Soumitra Nandi
PY  - 2026
DA  - 2026/09/10
PB  - arXiv
DO  - 10.48550/arxiv.2609.11840
UR  - https://arxiv.org/abs/2609.11840
AB  - We investigate the effects of a massive invisible fermion in Λ_b^0 → Λ_c^+ ℓ^- X̅_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.
ER  -