An Investigation of D+--> tau+ nu
High Energy Physics - Experiment
2010-04-08 v1
Abstract
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.
Cite
@article{arxiv.hep-ex/0604043,
title = {An Investigation of D+--> tau+ nu},
author = {P. Rubin and CLEO Collaboration},
journal= {arXiv preprint arXiv:hep-ex/0604043},
year = {2010}
}
Comments
14 pages postscript,also available through this http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRD