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Scalar and tensor form factors for Λ→pℓν¯ℓ from lattice QCD

Constantia Alexandrou1,2, Simone Bacchio1, Andreas Konstantinou1,2, and Eleni Vakana2

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Phys. Rev. D 114, 014507 – Published 16 July, 2026

DOI: https://doi.org/10.1103/pvrh-c8lt

Abstract

We present a determination of the scalar and tensor Λ→p transition form factors using lattice QCD. These form factors are relevant for semileptonic hyperon decays in the presence of extensions of the Standard Model that include scalar and tensor interactions. The calculation is carried out using a gauge ensemble of twisted mass fermions at the physical pion mass, following the same strategy as our recent study on vector and axial form factors for the same transition [S. Bacchio and A. Konstantinou, Phys. Rev. Lett. 135, 231901 (2025)]. We provide the complete set of form factors as functions of q2 employing a model-independent parametrization. We examine their impact on searches for nonstandard charged-current interactions via the muon-to-electron decay-rate ratio Rμe=Γ(Λ→pμν¯μ)/Γ(Λ→peν¯e), where scalar and tensor contributions enter linearly and are helicity enhanced relative to the electron channel. We compare this first-principles prediction for the decay-rate ratio with recent experimental measurements, thereby enabling improved constraints on nonstandard charged-current interactions.

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Phys. Rev. D 114, 014507– Published 16 July, 2026
  • Received 23 April 2026
  • Accepted 25 June 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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