Accumulating evidence for nonstandard leptonic decays of Ds mesons.
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 3.8sigma 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.
Dobrescu
Bogdan A
BA
Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA.
Kronfeld
Andreas S
AS