2009/06/30 by Ilja Doršner, Ilja Dorsner, Svjetlana Fajfer +3 · 3 citations
Mathematics · Physics and Astronomy · #Charm (quantum number) #Electron #Geometry #Higgs boson #High-Energy Particle Collisions Research #Lepton #Leptoquark #Mathematics #Meson #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Scalar (mathematics) #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2009.10.087
published as Phys.Lett.B682:67-73,2009 · 8 pages, 2 figures, revtex format
arxiv created 2009/07/07 · openalex publication_date 2009/10/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Motivated by the disagreement between experimental and lattice QCD results on the Ds decay constant we systematically reinvestigate role of leptoquarks in charm meson decays. We consider scalar leptoquarks that transform as a weak interaction triplet, doublet, or singlet in a model independent approach, and also argue that in a particular SU(5) GUT model these leptoquark states, contained in the 45-dimensional Higgs representation, could be safe against proton decay bounds. Using the current experimental measurements in tau, kaon and charm sectors, we find that scalar leptoquarks cannot naturally explain the Ds --> mu nu and Ds --> tau nu decay widths simultaneously. While any contributions of the triplet leptoquarks are already excluded, the singlets could only contribute significantly to the Ds --> tau nu width. Finally, a moderate improvement of the experimental upper bound on the D0 --> mu+μ- decay width could exclude the doublet contribution to the Ds --> mu nu, while present experimental data limits its mass to be below 1.4 TeV. Possible new signatures at present and near future experiments are also briefly discussed.