2022/03/03 by Marcel Golz, Golz, Marcel, Gudrun Hiller +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle Detector Development and Performance #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.2203.01965
6 pages, 3 figures, Contribution to the 11th International Workshop on the CKM Unitarity Triangle (CKM2021), 22-26 November 2021, The University of Melbourne, Australia
arxiv created 2022/03/03 · openalex publication_date 2022/03/03 · arxiv updated 2022/03/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Rare \vert Δc \vert=\vert Δu \vert=1 processes uniquely probe flavor in the Standard Model and beyond from the up-type quark sector. Opportunities to search for BSM physics in charm arise from the severe GIM suppression which kills SM contributions to leptonic axial-vector contributions and suppresses CP violation. Semileptonic decays of charmed hadrons offer a variety of clean null test observables, featuring new physics effects which are even enhanced by resonance contributions. In particular, angular observables in three- and self-analyzing four-body baryon decays, such as Λc→ p ℓ+ℓ- and Ξc+→Σ+(→ pπ0)ℓ+ℓ-, Ξc0→Λ0 (→ p π-)ℓ+ℓ- and Ωc0→Ξ0 (→ Λ0 π0)ℓ+ℓ- disentangle possible new physics effects in electromagnetic dipole couplings C7(′) and (axial-)vector 4-fermion ones C(′)9 (10). There is sensitivity to BSM couplings as small as ∼ 0.01.