First observation of the direct detection of positive D-meson into anti-K-long + 3 pions and negative D-meson into K-long + 3 pions with the Fermilab FOCUS experiment
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Date
2014-04
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Vanderbilt University. Department of Physics and Astronomy
Abstract
In this thesis the decays of positive D-mesons into neutral anti-K-mesons and
three charged pions and of negative D-mesons into neutral K-mesons and three
charged pions are reconstructed in both long and short neutral K-meson states.
The data were taken with the Fermilab FOCUS spectrometer. This constitutes the
first observation of these decays in the long K-meson mode. We detail
the cuts necessary to find the branching ratio for the K-long to K-short
modes for both positive and negative D-mesons, show that the ratio is 0.89,
and detail further work that remains to be done. The K-long mode is
reconstructed using the D-meson flight direction, the direction of the
charged pions, and the energy deposited in the hadron calorimeter.
The K-short decay is reconstructed directly using tracking information in
the pi plus - pi minus decay mode.
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Keywords
D-meson branching ratio, K-long, K-short, FOCUS experiment