An Investigation of D+--> tau+ nu

Physics – High Energy Physics – High Energy Physics - Experiment

Scientific paper

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14 pages postscript,also available through this http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRD

Scientific paper

10.1103/PhysRevD.73.112005

We test whether or not the tau lepton manifests the same couplings as the mu lepton by investigating the relative decay rates in purely leptonic D+ meson decays. Specifically, we place the first upper limit on the ratio R=Gamma(D+ -> tau+ nu)/Gamma(D+ -> mu+ nu). We use 281 inverse pb of data accumulated at the psi(3770) resonance with the CLEO-c detector, to determine B(D+ -> tau+ nu) < 2.1 x 10^(-3) at 90% confidence level (C. L.). The ratio of R to the Standard Model expectation of 2.65 then is <1.8 at 90% C. L., consistent with the prediction of lepton universality.

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