Dalitz decays D_sJ^(*) → D_s^(*) ℓ⁺ ℓ^-

2023/08/07 by Pietro Colangelo, Colangelo, Pietro, Fulvia De Fazio +5
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2308.03453

openalex publication_date 2023/08/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The Dalitz decays of the positive parity D_sJ^(*) charmed mesons, D_sJ^(*) → D_s^(*) ℓ⁺ ℓ^- with J=0,1,2 and ℓ=e, μ, are important processes to investigate the nature of the D_sJ^(*) states. We analyze the full set of decays, considering the four lightest D_sJ^(*) mesons as belonging to the heavy quark spin doublets s_ℓ^P=(1)/(2)⁺ and (3)/(2)⁺, with s_ℓ^P the spin-parity of the light degrees of freedom in mesons. The description implies relations among the observables in various modes. We study the decay distributions in the dilepton invariant mass squared and the distributions in the angle between the charged lepton momentum and the momentum of the produced meson, which are expressed in terms of universal form factors and of effective strong couplings. Such measurements are feasible at the present facilities.

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