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2008

Accumulating evidence for nonstandard leptonic decays of D_s mesons

Dobrescu, Bogdan A., Kronfeld, Andreas S.

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The measured rate for D_s -> l nu decays, where l is a muon or tau, is larger than the standard model prediction, which relies on lattice QCD, at the 3.8 sigma level.

We discuss how robust the theoretical prediction is, and we show that the discrepancy with experiment may be explained by a charged Higgs boson or a leptoquark.

Accumulating evidence for nonstandard leptonic decays of D_s mesons · Around

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Owing to the small energy release, a reported − 8 -8 % correction to D s → τ ν D_{s}\!\to\!\tau\nu [G. L. Wang, C. H. Chang and T. F. Feng, arXiv:hep-ph/0102251] is unlikely to be correct
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E. Follana, C. T. H. Davies, G. P. Lepage and J. Shigemitsu [HPQCD Collaboration], Phys. Rev. Lett. 100
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