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Model independent calculation of \({\cal{B}}({\bar{B}}^0\rightarrow D^{(*)+} \tau^-{\bar{\nu}})/{\cal{B}}({\bar{B}}^0\rightarrow D^{(*)+} e^-{\bar{\nu}})\)

  • D.S. Hwang
  • D.-W. Kim
Theoretical physics

Abstract.

Using the formulas for the \({\mathrm{d}}\Gamma /{\mathrm{d}}q^2\) distribution with non-zero lepton mass and experimentally determined form factors, we calculate the \({\mathrm{d}}\Gamma (D^{(*)+} l^-{\bar{\nu}})/ {\mathrm{d}}q^2\) spectra and branching fractions for l = e, \(\mu\) and \(\tau\). We obtain the results \({\cal{B}}({\bar{B}}^0\rightarrow D^{+} \tau^-{\bar{\nu}})/ {\cal{B}}({\bar{B}}^0\rightarrow D^{+}e^-{\bar{\nu}})= 0.278^{+0.049}_{-0.035}\) and \({\cal{B}}({\bar{B}}^0\rightarrow D^{*+} \tau^-{\bar{\nu}})/{\cal{B}}({\bar{B}}^0\rightarrow D^{*+} e^-{\bar{\nu}})=0.256^{+0.014}_{-0.013}\) . Since we used the experimentally measured form factors, these results are independent of theoretical models of the form factors.

Keywords

Theoretical Model Form Factor Measured Form Lepton Mass Independent Calculation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • D.S. Hwang
    • 1
  • D.-W. Kim
    • 2
  1. 1.Department of Physics, Sejong University, Seoul 143–747, KoreaKR
  2. 2.Department of Physics, Kangnung National University, Kangnung 210-702, KoreaKR

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