Measurement of the lifetime of charged and neutralD mesons with high resolution silicon strip detectors

1985 
We have measured the lifetime of charged and neutralD mesons using high resolution silicon strip detectors in the NA11 spectrometer at the CERN SPS. TheD mesons were produced in 200 GeV π− interactions. We obtain a value of\(\tau _{D^ \pm } = \left( {10.6\begin{array}{*{20}c} { + 3.6} \\ { - 2.4} \\ \end{array} } \right) \cdot 10^{ - 13} s\) based on 28, and\(\tau _{D^0 } = \left( {3.7\begin{array}{*{20}c} { + 1.0} \\ { - 0.7} \\ \end{array} } \right) \cdot 10^{ - 13} s\) based on 26 fully reconstructed decays for the lifetime of the charged and the neutralD meson, respectively. For the ratio\(\tau _{D^ \pm } /\tau _{D^0 }\) we find 2.8−0.8+1.1.
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