Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-06-30
Phys.Lett.B682:67-73,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 2 figures, revtex format
Scientific paper
10.1016/j.physletb.2009.10.087
Motivated by the disagreement between experimental and lattice QCD results on the D_s 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 D_s --> mu nu and D_s --> tau nu decay widths simultaneously. While any contributions of the triplet leptoquarks are already excluded, the singlets could only contribute significantly to the D_s --> tau nu width. Finally, a moderate improvement of the experimental upper bound on the D^0 --> mu^+\mu^- decay width could exclude the doublet contribution to the D_s --> 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.
Dorsner Ilja
Fajfer Svjetlana
Kamenik Jernej F.
Kosnik Nejc
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