Accumulating Evidence for Nonstandard Leptonic Decays of $D_s$ Mesons

by Andreas Kronfeld (FNAL)

Friday 7 Mar 2008, 14:00 → 15:00 Europe/Zurich

TH Theory Conference Room (CERN)

Measurements of the decay rate $D_s^+\to \ell^+\nu$, where $\ell$ is a muon or tau, disagree with the standard model prediction at the level of 3.8$\sigma$. I discuss how robust the theoretical prediction is, examining radiative corrections briefly and lattice-QCD calculations in more detail. Then I consider how nonstandard particles - such as W bosons, charged Higgs bosons, and leptoquarks - could explain the discrepancy.

Slides fDs.pdf