Semileptonic Decays on the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>D</mi></math></span> Meson

W. Bacino; T. Ferguson; L. Nodulman; W. Slater; H. Ticho; A. Diamant-Berger; G. Donaldson; M. Duro; A. Hall; G. Irwin; J. Kirkby; F. Merritt; S. Wojcicki; R. Burns; P. Condon; P. Cowell; J. Kirz

doi:10.1103/PhysRevLett.43.1073

Semileptonic Decays on the $D$ Meson

W. Bacino, T. Ferguson, L. Nodulman, W. Slater, H. Ticho, A. Diamant-Berger, G. Donaldson, M. Duro, A. Hall, G. Irwin, J. Kirkby, F. Merritt, S. Wojcicki, R. Burns, P. Condon, P. Cowell, and J. Kirz

Phys. Rev. Lett. 43, 1073 – Published 8 October 1979

Abstract

The electron energy spectrum in the process $e^{+} e^{-} \to ψ^{''} (3770) \to e^{\pm} + (> 2 charged particles)$ has been used to determine the $D (56 % D^{0} + 44 % D^{+})$ semileptonic branching ratio. Assuming the Glashow-Iliopoulos-Maiani model, it is found that the inclusive branching ratio is $b (D \to Xe ν) = 0.080 \pm 0.015$ and the state $X$ is dominated by $K$ and $K π$ . The fraction of $K π e ν$ is (37 ± 16)% if the $K π$ system is entirely $K^{*} (890)$ , or (55 ± 21)% if the $K π$ system is nonresonant. Within the assumptions of the analysis, the $D$ lifetime is calculated to be (2.5 ± 1.6) × $10^{- 13}$ sec.

Received 28 June 1979

DOI:https://doi.org/10.1103/PhysRevLett.43.1073

Authors & Affiliations

W. Bacino, T. Ferguson^*, L. Nodulman^†, W. Slater, and H. Ticho

Physics Department, University of California, Los Angeles, California 90024

A. Diamant-Berger^‡, G. Donaldson, M. Duro, A. Hall^§, G. Irwin, J. Kirkby, F. Merritt, and S. Wojcicki

Stanford Linear Accelerator Center and Physics Department, Stanford University, Stanford, California 94305

R. Burns^∥, P. Condon^¶, and P. Cowell^**

Physics Department, University of California, Irvine, California 92664

J. Kirz

Physics Department, State University of New York, Stony Brook, New York 11794

^*Current address: Cornell University, Ithaca, N. Y. 14853.
^†Current address: Argonne National Laboratory, Argonne, Ill. 60439.
^‡Permanent address: Départment de Physique de Particules Elémentaires, Saclay, France.
^§Current address: Varian Associates, Palo Alto, Cal. 94303.
^∥Current address: Hughes Aircraft Co., Newport Beach, Cal. 92663.
^¶Current address: Lawrence Berkeley Laboratory, Berkeley, Cal. 94720.
^**Current address: Systems Control, Inc., Palo Alto, Cal. 94303.