Rare radiative charm decays within the standard model and beyond

2017/01/31 by Stefan de Boer, Gudrun Hiller · 1 citation
Physics and Astronomy · #Asymmetry #Branching fraction #CP violation #Dipole #High-Energy Particle Collisions Research #Lepton #Leptoquark #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Radiative transfer #Standard Model (mathematical formulation) #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep08(2017)091

23 pages plus references and appendices, 7 figures; v2: clarifications and references added, conclusions unchanged; v3: In section IV.B on leptoquark models matching corrected and subsequent text, tables and equations adapted. Phenomenological results and conclusions unchanged

openalex publication_date 2017/08/01 · arxiv created 2018/09/28 · arxiv updated 2018/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present standard model (SM) estimates for exclusive c → uγ processes in heavy quark and hybrid frameworks. Measured branching ratios B(D⁰→ (φ, K^{∗ 0})γ ) are at or somewhat exceeding the upper range of the SM and suggest slow convergence of the 1/m D , α s -expansion. Model-independent constraints on |ΔC| = | ΔU | = 1 dipole operators from ℬ(D 0 → ρ 0 γ) data are obtained. Predictions and implications for leptoquark models are worked out. While branching ratios are SM-like CP asymmetries ≲ 10% can be induced. In SUSY deviations from the SM can be even larger with CP asymmetries of O(0.1). If Λ c -baryons are produced polarized, such as at the Z-pole, an angular asymmetry in Λ c → pγ decays can be studied that is sensitive to chirality-flipped contributions.

Citations

• General formulae for f₁ → f₂ γ
• Comment on D_s^* → D_s π⁰ Decay
• B(s), D(s)→ π, K, η, ρ, K*, ω, ϕ TRANSITION FORM FACTORS AND DECAY RATES WITH EXTRACTION OF THE CKM PARAMETERS |Vub|, |Vcs|, |Vcd|
• B→Vγbeyond QCD factorization
• Charm meson resonances andD→Vsemileptonic form factors
• Production, decay, and polarization of excited heavy hadrons
• Model independent constraints on leptoquarks from rare processes
• Exclusive chromomagnetism in heavy-to-light FCNCs
• Calculation of long-distance effects in exclusive weak radiative decays of B-mesons
• Decay constants and form factors ofs-wave andp-wave mesons in the covariant light-front quark model
• A complete analysis of FCNC and CP constraints in general SUSY extensions of the standard model
• Two-body Cabibbo-suppressed decays of charmed baryons into vector mesons and into photons
• Physics case of FCC-ee
• The c → uγ contribution to weak radiative charm decay
• HEAVY QUARK PHYSICS FROM LATTICE QCD
• Review of Multibody Charm Analyses

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