BSM reach of rare charm decays, including the rising star Λ_c→ pμ⁺μ^-

2025/05/12 by Gisbert, Hector, Hiller, Gudrun, Suelmann, Dominik
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2505.07954

Abstract

We perform the first global fit of rare charm transitions using recent data on D⁰→ μ⁺μ^-, D⁺→π⁺μ⁺μ^-, Λ_c→ pμ⁺μ^- and D⁰→π⁺π^-μ⁺μ^- decays, including angular observables. We work out constraints on new physics in the framework of the weak effective field theory. While angular observables in D⁰→π⁺π^-μ⁺μ^- decays provide sensitivities to different QCD models, future null tests in Λ_c→ p μ⁺μ^- look more promising to extract limits because of less hadronic uncertainties. This marks Λ_c→ p μ⁺μ^- as the rising star of rare charm decays.

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