Work

Looking at radiative corrections to the $Σ^\pm\toΛe^\pm \barν$ semileptonic decay-rate ratio

Year: 2026

Type: preprint

Abstract: We investigate the impact of radiative corrections on the ratio of the semileptonic decay rates $Σ^\pm\toΛe^\pm \barν$. Phenomenological analyses point to sizable radiative effects on the experimentally measured ratio. From a theoretical perspective, this observable is particularly appealing because several hadronic and electroweak contributions partially cancel in the ratio, providing a cleaner probe of electromagnetic effects. We identify the dominant contributions to the radiative corrections and develop the framework for a dedicated calculation. This represents a first step toward a precise theoretical description of baryon semileptonic decays, helping to assess their potential as precision tests of the Standard Model.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.03183

Authors: Alexandrou, Constantia, Bacchio, Simone, Evangelista, Antonio, Konstantinou, Andreas, Tantalo, Nazario

Institutions: University of Cyprus, Cyprus Institute, University of Rome Tor Vergata

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

Funders: European Commission, Research and Innovation Foundation

Awards: Three-dimensional imaging of the nucleon using lattice QCD, G6188493540, Muon HVP and smeared R-ratio from Lattice QCD, Hyperon structure and semileptonic decays from lattice QCD

OpenAlex ID: W7220448865

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