Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-12-10
PoS LATTICE2008:282,2008
Physics
High Energy Physics
High Energy Physics - Lattice
9 pp. Parallel talk at Lattice 2008. arXiv version includes appendix with more details on BSM semileptonic amplitude and rate
Scientific paper
Recent measurements of the branching fraction for D_s -> l nu disagree with the Standard Model expectation, which relies on calculations of $f_{D_s}$ from lattice QCD. This paper uses recent preliminary measurements from CLEO and a new preliminary lattice-QCD result from this conference to update the significance of the discrepancy. The "f_{D_s} puzzle" stands now at 3.5sigma, with sigma predominantly from the statistical uncertainty of the experiments. New physics scenarios that could solve the puzzle would also lead to non-Standard amplitudes mediating the semileptonic decays D -> K l nu. This paper shows where the new amplitudes enter the differential rate and outlines where lattice QCD calculations are needed to confront recent and forthcoming measurements.
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